Amplifiers

{"id":14911995412857,"title":"Moonriver Audio 505 Phono Stage","handle":"moonriver-audio-505-phono-stage","description":"\u003cdiv class=\"uncode_text_column\"\u003e\n\u003cdiv class=\"uncode_text_column\"\u003e\n\u003ch2\u003eThe 505 Hybrid phono stage\u003c\/h2\u003e\n\u003cp\u003eThe Moonriver Audio 505 phono stage meets all the needs of any demanding audiophile who loves vinyl records, both now and in the future. Designed with audiophiles, record collectors and vinyl freaks in mind, it boasts 4 inputs for all your turntables, tone-arms and cartridges. It also supports every possible adjustment on the fly with dedicated knobs and switches to ideally match your MC or MM cartridge.\u003c\/p\u003e\n\u003cp\u003eThe unique, adjustment feature of the Moonriver 505 hybrid phono stage allows “on the fly” listening tests with various adjustments without the need to switch off, remove the cover, switch on again and wait to warm it up.\u003c\/p\u003e\n\u003cp\u003eThe hybrid design combines  the use of ICs and discrete solid-state circuits  to form  an ideal, high performance and ultra low noise circuit. While the IC op amps offer very low noise levels, a discrete circuit offers lifelike drive and dynamics which is impossible to get from IC op-amps.\u003c\/p\u003e\n\u003cp\u003eAs for the sonic signature of all Moonriver Audio products, we strive to balance the fine line between musicality \u0026amp; resolution. The soul of the music is in the midrange, this is where most of the emotion, the passion, the joie de vivre is contained.\u003c\/p\u003e\n\u003cp\u003eOn a technical level, it’s within the frequency band of 200 – 4,000Hz. Without a solid foundation underneath the midrange, the music sounds thin \u0026amp; brittle and often un-involving. If the brain perceives that the sound is artificial, then it’s difficult to be swept away by the message contained within the music.\u003c\/p\u003e\n\u003cp\u003eSimilarly, accurate timbre reproduction is essential. A New York Steinway does have noticeable sonic differences from a Hamburg Steinway, while a Guarneri violin sounds distinct from a Stradivarius. To capture all those nuances, the loudspeakers \u0026amp; electronics need to act in unison, neither obscuring, nor exaggerating detail.\u003c\/p\u003e\n\u003cp\u003eThe sound and the level of performance of the Moonriver 505 phono stage is hard to describe and it must be heard to be believed.\u003c\/p\u003e\n\u003ch2\u003eDesign \u0026amp; User Interface\u003c\/h2\u003e\n\u003cp\u003eWe had a very clear vision when conceiving the Model 505 hybrid phono stage: Classic design with a modern touch; high quality materials such as oversized aluminium knobs, solid walnut cheeks, sturdy chassis and an ergonomic user interface.\u003cbr\u003eThere are no “for show” aesthetics here, no display with complicated serial menus and hidden functions, nor a single multi-function knob for “minimalistic” purposes.\u003cbr\u003eThe heart of the Model 505 is pure and minimal, but the interface is user-oriented and easy to operate by anyone in seconds, with no need to resort to the user manual.\u003c\/p\u003e\n\u003ch2\u003eFeatures\u003c\/h2\u003e\n\u003cp\u003eGiving direct access to all necessary adjustments, the 505 includes 4 knobs and 5 switches for all the adjustments: 4 inputs, 12 gain settings (6 for MM and 6 for MC), 5 MM capacitance settings, 5 MC load settings, including a custom option, 3 MM load settings and EQ choice for RIAA, Decca or Columbia 78 rpm records. The 505 phono stage will handle the signal from your precious MC cartridge with unmatched performance and it will make your everyday MM cartridge sound like never before.\u003c\/p\u003e\n\u003ch2\u003ePower supply\u003c\/h2\u003e\n\u003cp align=\"left\" class=\"western\"\u003eThe Moonriver 505 hybrid phono stage contains 6 separated power supplies, including a massive 70000uf total capacitance and it is designed in dual mono operation. Each stage has its own power supply, including a linear discrete regulator circuit and a discrete noise rejection circuit.\u003c\/p\u003e\n\u003ch2\u003eActive gain stage\u003c\/h2\u003e\n\u003cp\u003eUsing ultra low noise active gain stages, the Moonriver 505 delivers a maximum gain of 72dB (x4000 times) in the MC setting. The MM and MC settings use different input stages with different op amps specifically chosen for each case. All setting functions are performed with air sealed, extremely low impedance relays. Finally, a discrete, high current output circuit delivers lifelike dynamics on the output.\u003c\/p\u003e\n\u003ch2\u003eMicrocontroller operation with save memory function\u003c\/h2\u003e\n\u003cp\u003eA microcontroller controls all functions and ensures an entirely silent operation. Every setting change is stored automatically for each of the 4 inputs. Every time you change the input, the last chosen settings are recalled automatically. For example, you can connect 4 MC cartridges or 4 MM cartridges or 2MC and 2 MM, or 3 MM and one MC, every combination is possible with different settings for every input.\u003c\/p\u003e\n\u003ch2\u003eDe-emphasis EQ\u003c\/h2\u003e\n\u003cp\u003eThe de-emphasis circuit is passive, the best possible approach for extreme flat frequency response without interference with the other stages. The EQ circuits involve 2 equalisation curves, a RIAA and a DECCA or COLUMBIA curve for 78rpm records. Both EQ circuits are formed using a minimalistic approach with very few, extremely low tolerance, audiophile quality components.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","published_at":"2025-03-01T14:21:35+00:00","created_at":"2025-03-01T14:17:07+00:00","vendor":"James-Morrow Entertainment Systems","type":"Phono Preamps","tags":["Amplifiers","Integrated Amplifiers","Moonriver"],"price":449900,"price_min":449900,"price_max":449900,"available":true,"price_varies":false,"compare_at_price":null,"compare_at_price_min":0,"compare_at_price_max":0,"compare_at_price_varies":false,"variants":[{"id":54990823719289,"title":"Default Title","option1":"Default Title","option2":null,"option3":null,"sku":null,"requires_shipping":true,"taxable":true,"featured_image":null,"available":true,"name":"Moonriver Audio 505 Phono Stage","public_title":null,"options":["Default Title"],"price":449900,"weight":0,"compare_at_price":null,"inventory_management":"shopify","barcode":null,"requires_selling_plan":false,"selling_plan_allocations":[]}],"images":["\/\/james-morrow.com\/cdn\/shop\/files\/Moonriver_505_Side_Zoom.jpg?v=1740838691","\/\/james-morrow.com\/cdn\/shop\/files\/Moonriver_505_Front_Zoom.jpg?v=1740838691","\/\/james-morrow.com\/cdn\/shop\/files\/Moonriver_505_Back_Zoom.jpg?v=1740838691"],"featured_image":"\/\/james-morrow.com\/cdn\/shop\/files\/Moonriver_505_Side_Zoom.jpg?v=1740838691","options":["Title"],"media":[{"alt":null,"id":64120390156665,"position":1,"preview_image":{"aspect_ratio":1.497,"height":1710,"width":2560,"src":"\/\/james-morrow.com\/cdn\/shop\/files\/Moonriver_505_Side_Zoom.jpg?v=1740838691"},"aspect_ratio":1.497,"height":1710,"media_type":"image","src":"\/\/james-morrow.com\/cdn\/shop\/files\/Moonriver_505_Side_Zoom.jpg?v=1740838691","width":2560},{"alt":null,"id":64120390123897,"position":2,"preview_image":{"aspect_ratio":1.497,"height":1710,"width":2560,"src":"\/\/james-morrow.com\/cdn\/shop\/files\/Moonriver_505_Front_Zoom.jpg?v=1740838691"},"aspect_ratio":1.497,"height":1710,"media_type":"image","src":"\/\/james-morrow.com\/cdn\/shop\/files\/Moonriver_505_Front_Zoom.jpg?v=1740838691","width":2560},{"alt":null,"id":64120390091129,"position":3,"preview_image":{"aspect_ratio":1.5,"height":1707,"width":2560,"src":"\/\/james-morrow.com\/cdn\/shop\/files\/Moonriver_505_Back_Zoom.jpg?v=1740838691"},"aspect_ratio":1.5,"height":1707,"media_type":"image","src":"\/\/james-morrow.com\/cdn\/shop\/files\/Moonriver_505_Back_Zoom.jpg?v=1740838691","width":2560}],"requires_selling_plan":false,"selling_plan_groups":[],"content":"\u003cdiv class=\"uncode_text_column\"\u003e\n\u003cdiv class=\"uncode_text_column\"\u003e\n\u003ch2\u003eThe 505 Hybrid phono stage\u003c\/h2\u003e\n\u003cp\u003eThe Moonriver Audio 505 phono stage meets all the needs of any demanding audiophile who loves vinyl records, both now and in the future. Designed with audiophiles, record collectors and vinyl freaks in mind, it boasts 4 inputs for all your turntables, tone-arms and cartridges. It also supports every possible adjustment on the fly with dedicated knobs and switches to ideally match your MC or MM cartridge.\u003c\/p\u003e\n\u003cp\u003eThe unique, adjustment feature of the Moonriver 505 hybrid phono stage allows “on the fly” listening tests with various adjustments without the need to switch off, remove the cover, switch on again and wait to warm it up.\u003c\/p\u003e\n\u003cp\u003eThe hybrid design combines  the use of ICs and discrete solid-state circuits  to form  an ideal, high performance and ultra low noise circuit. While the IC op amps offer very low noise levels, a discrete circuit offers lifelike drive and dynamics which is impossible to get from IC op-amps.\u003c\/p\u003e\n\u003cp\u003eAs for the sonic signature of all Moonriver Audio products, we strive to balance the fine line between musicality \u0026amp; resolution. The soul of the music is in the midrange, this is where most of the emotion, the passion, the joie de vivre is contained.\u003c\/p\u003e\n\u003cp\u003eOn a technical level, it’s within the frequency band of 200 – 4,000Hz. Without a solid foundation underneath the midrange, the music sounds thin \u0026amp; brittle and often un-involving. If the brain perceives that the sound is artificial, then it’s difficult to be swept away by the message contained within the music.\u003c\/p\u003e\n\u003cp\u003eSimilarly, accurate timbre reproduction is essential. A New York Steinway does have noticeable sonic differences from a Hamburg Steinway, while a Guarneri violin sounds distinct from a Stradivarius. To capture all those nuances, the loudspeakers \u0026amp; electronics need to act in unison, neither obscuring, nor exaggerating detail.\u003c\/p\u003e\n\u003cp\u003eThe sound and the level of performance of the Moonriver 505 phono stage is hard to describe and it must be heard to be believed.\u003c\/p\u003e\n\u003ch2\u003eDesign \u0026amp; User Interface\u003c\/h2\u003e\n\u003cp\u003eWe had a very clear vision when conceiving the Model 505 hybrid phono stage: Classic design with a modern touch; high quality materials such as oversized aluminium knobs, solid walnut cheeks, sturdy chassis and an ergonomic user interface.\u003cbr\u003eThere are no “for show” aesthetics here, no display with complicated serial menus and hidden functions, nor a single multi-function knob for “minimalistic” purposes.\u003cbr\u003eThe heart of the Model 505 is pure and minimal, but the interface is user-oriented and easy to operate by anyone in seconds, with no need to resort to the user manual.\u003c\/p\u003e\n\u003ch2\u003eFeatures\u003c\/h2\u003e\n\u003cp\u003eGiving direct access to all necessary adjustments, the 505 includes 4 knobs and 5 switches for all the adjustments: 4 inputs, 12 gain settings (6 for MM and 6 for MC), 5 MM capacitance settings, 5 MC load settings, including a custom option, 3 MM load settings and EQ choice for RIAA, Decca or Columbia 78 rpm records. The 505 phono stage will handle the signal from your precious MC cartridge with unmatched performance and it will make your everyday MM cartridge sound like never before.\u003c\/p\u003e\n\u003ch2\u003ePower supply\u003c\/h2\u003e\n\u003cp align=\"left\" class=\"western\"\u003eThe Moonriver 505 hybrid phono stage contains 6 separated power supplies, including a massive 70000uf total capacitance and it is designed in dual mono operation. Each stage has its own power supply, including a linear discrete regulator circuit and a discrete noise rejection circuit.\u003c\/p\u003e\n\u003ch2\u003eActive gain stage\u003c\/h2\u003e\n\u003cp\u003eUsing ultra low noise active gain stages, the Moonriver 505 delivers a maximum gain of 72dB (x4000 times) in the MC setting. The MM and MC settings use different input stages with different op amps specifically chosen for each case. All setting functions are performed with air sealed, extremely low impedance relays. Finally, a discrete, high current output circuit delivers lifelike dynamics on the output.\u003c\/p\u003e\n\u003ch2\u003eMicrocontroller operation with save memory function\u003c\/h2\u003e\n\u003cp\u003eA microcontroller controls all functions and ensures an entirely silent operation. Every setting change is stored automatically for each of the 4 inputs. Every time you change the input, the last chosen settings are recalled automatically. For example, you can connect 4 MC cartridges or 4 MM cartridges or 2MC and 2 MM, or 3 MM and one MC, every combination is possible with different settings for every input.\u003c\/p\u003e\n\u003ch2\u003eDe-emphasis EQ\u003c\/h2\u003e\n\u003cp\u003eThe de-emphasis circuit is passive, the best possible approach for extreme flat frequency response without interference with the other stages. The EQ circuits involve 2 equalisation curves, a RIAA and a DECCA or COLUMBIA curve for 78rpm records. Both EQ circuits are formed using a minimalistic approach with very few, extremely low tolerance, audiophile quality components.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e"}

{"id":14911971852665,"title":"Moonriver Audio Reference 404 Integrated Amplifier","handle":"moonriver-audio-reference-404-integrated-amplifier","description":"\u003ch2\u003eThe 404 Reference integrated amplifier\u003c\/h2\u003e\n\u003cp\u003eFollowing the runaway success of The Moonriver Model 404 (Standard), we decided to move a step further by improving on the already excellent design platform of the Standard 404 model. The Moonriver Model 404 Reference achieves even better performance over the Standard Model, while retaining a sensible price point.\u003c\/p\u003e\n\u003cp\u003eJust like the Standard Model 404, the 404 Reference amplifier will extract hidden elements, and render textures from within any audio format; but with the capability to drive any speaker on the market – despite its moderate power. Only the source, speakers and room will set the performance limit. Its culture will suit all music, as the Model 404 is by design, set to define the faintest nuances of which tonal integrity is composed.\u003c\/p\u003e\n\u003cp\u003eThe power supply section has been improved to the maximum. The 404 standard uses a total of 57000uf capacitance. The 404 Reference lifts the capacitance to a spectacular 107000uf of which 21000 of them are reserved for the preamp only.  This enormous increment expands the driving behaviour; the dynamic character; digs out more detail; low level information; a deeper and more articulate soundtstage; space between instruments is vast, while the bass has greater authority and is more confident than ever before.\u003c\/p\u003e\n\u003cp\u003eThe texture of each individual instrument is exposed exponentially in comparison with the Standard version. A fully discrete preamp section serves to provide acute dynamic awareness, while a high output stage that is custom-optimised for bandwidth and distortion, gives neutral character and transient fidelity. A sophisticated selection of components fuses the design against tonal traits, therefore preserving naturalness throughout the shortest feasible signal path.\u003c\/p\u003e\n\u003cp\u003eFurthermore, an integrated phono stage, USB DAC, (two) preamp outputs and a tape monitor loop expand functionality to form an ideally flexible integrated amplifier.\u003c\/p\u003e\n\u003ch2\u003eModular Architecture\u003c\/h2\u003e\n\u003cp\u003eMoonriver 404 Reference amplifier is modular like its brother; it can accommodate an MM or MM\/MC phono stage and a USB asynchronous DAC.  Fitting these modules is simple, and can take place at any time, on or after purchase.  The USB DAC may also be upgraded with a newer version to meet future needs and technologies.\u003c\/p\u003e\n\u003ch2\u003eBalance Control\u003c\/h2\u003e\n\u003cp\u003eYou may find this feature to be vanishingly scarce in audiophile products as a result of today’s ‘minimalist’ design mentality and the various myths accompanying it. However, balance control addresses a common problem: speakers that are positioned in asymmetry, in a non-balanced room environment. It therefore provides the simplest tweak towards achieving a proper soundstage.\u003c\/p\u003e\n\u003cp\u003eLiving rooms and house furniture are meant to serve everyday life and may not be positioned in an ideal listening spot, evenly distanced from each speaker to form an equilateral triangle. It is also not uncommon for one speaker to have to be placed nearer room boundaries than the other, having various frequencies boosted in a more or less predictable pattern. More often than not, balance control is incredibly useful as it drastically helps overcome volume level unevenness and in some cases, even reclaiming the stereo effect and the resulting focused sound stage.\u003c\/p\u003e\n\u003cp\u003eIt is to be expected, the way the balance control is implemented on the Moonriver 404 Reference amplifier – in parallel, will not degrade or affect the signal in any way that is determinable.\u003c\/p\u003e\n\u003ch2\u003eDiscovering the layout\u003c\/h2\u003e\n\u003cp\u003eModel 404 Reference, like the standard model, incorporates no less than 5 separate power supplies, each featuring overload protection. The power amplifier specifically runs on a dual mono configuration, beginning from separate windings on the toroidal transformer.\u003c\/p\u003e\n\u003cp\u003eWBT nextgenTM speaker terminals ensure the massive flow of current from the amplifier’s output stage, is able to drive even “difficult to drive” speakers.\u003c\/p\u003e\n\u003cp\u003eSignal switches are implemented via relays, while volume attenuation is trusted on the legendary blue ALPS pot.\u003c\/p\u003e\n\u003cp\u003eA soft start circuit based on a 30A relay ensures that even the on\/off switch is thought out to work with virtually no burden or wear for decades.\u003c\/p\u003e\n\u003cp\u003eThe 404 Reference chassis reduces unwanted resonant vibrations even further with absorbent materials, and better integral mechanical support.\u003c\/p\u003e\n\u003cp\u003eComponents are carefully selected for both suitability and reliability. We make no use of surface-mount in analog circuits, despite the fact that through-hole production costs more, and requires advanced space management \u0026amp; layout strategies.\u003c\/p\u003e\n\u003cp\u003eEach element utilised has to be of proven stability and sustained higher performance – proficient implementation provided, before making it into our analog paths.\u003c\/p\u003e\n\u003cp\u003eAs for the sound, we are not to say whether Model 404 Reference is virtually transparent or inherently forgiving. Voicing it to appreciate the playlist and respect the user at all times has been the sum of all of our effort; \u003cem\u003ea sincere effort to achieve effortlessness.\u003c\/em\u003e\u003c\/p\u003e\n\u003cdiv class=\"uncode_text_column\"\u003e\n\u003ch2\u003eOptional Phono Stage\u003c\/h2\u003e\n\u003cp\u003eModel 404 Reference comes with two options in the phono stage department; one is MM only and the other is MM\/MC selectable. Both follow the exact quality principles that Model 404 Reference is built on. Quality components and massive power supplies are also employed here, to efficiently accommodate very low noise, high performance op-amps.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"uncode_text_column\"\u003e\n\u003cp\u003eThe gain in the MM\/MC phono can be adjusted, simply by changing the dip switches position. The MC input load can be set also, by replacing the original 100 Ohm input resistor with a higher or lower value. No soldering is required.\u003c\/p\u003e\n\u003cdiv class=\"uncode_text_column\"\u003e\n\u003ch2\u003eOptional SPDIF DAC\u003c\/h2\u003e\n\u003cp\u003eThe add-on dac module is based on the 9000 series ESS Sabre dac chip. The SPDIF supports PCM streams up to 192kHz\/24bit due to the limitation of the SPDIF (coaxial) specifications. There are 3 separated power supplies with very low noise regulators, 2 for the ESS dac board and 1 for the analog circuit. The capacitor bank is massive and it uses 42000uF (in case of 404 Reference) from the power amplifier’s power supply.\u003c\/p\u003e\n\u003cp\u003eSpecially care has been given to the voicing of the analog output stage to match the dynamic and natural character of Moonriver sound. The result is an impressive sounding digital-to-analog converter which respects the timing, the space and the color of the music and unfolds the dynamic contrast – the definition of every musical event.\u003ca href=\"https:\/\/moonriveraudio.com\/the-404-reference-integrated-amplifier\/#\" class=\"inactive-link pushed\" data-lb-index=\"0\" tabindex=\"-1\"\u003e\u003c\/a\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"uncode_text_column\"\u003e\n\u003ch2\u003eOptional USB DAC\u003c\/h2\u003e\n\u003cp\u003eWhat was desired for our USB DAC module was not to make an addition rather than an omission; instead we had to be confident of substantially raising the true value and functionality of Model 404.\u003c\/p\u003e\n\u003cp\u003eThe add-on USB dac module is also based on the 9000 series ESS Sabre dac chip with native DSD support. The USB dac supports PCM up to 384kHz\/24bi and DSD up to 128. The USB input section is separated with discrete, very low drift clocks, XMOS input based chip with custom firmware. There are 5 separated power supplies with very low noise regulators, 2 for the USB board, 2 for the ESS dac board and 1 for the analog circuit. Specially care has been given to the voicing of the analog output stage to match the dynamic and natural character of Moonriver sound. The capacitor bank is massive and it uses 42000uF (in case of 404 Reference) from the power amplifier’s power supply.\u003c\/p\u003e\n\u003cp\u003eA new USB DAC for the Moonriver 404 Standard and Reference will be announced shortly.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","published_at":"2025-03-01T14:12:03+00:00","created_at":"2025-03-01T12:28:50+00:00","vendor":"James-Morrow Entertainment Systems","type":"Amplifiers","tags":["Amplifiers","Integrated Amplifiers","Moonriver"],"price":449900,"price_min":449900,"price_max":584700,"available":true,"price_varies":true,"compare_at_price":null,"compare_at_price_min":0,"compare_at_price_max":0,"compare_at_price_varies":false,"variants":[{"id":54990751891833,"title":"No DAC \/ No Phono Stage","option1":"No DAC","option2":"No Phono Stage","option3":null,"sku":"","requires_shipping":true,"taxable":true,"featured_image":{"id":73392167518585,"product_id":14911971852665,"position":2,"created_at":"2025-03-01T12:35:36+00:00","updated_at":"2025-03-01T12:35:40+00:00","alt":null,"width":2560,"height":1710,"src":"\/\/james-morrow.com\/cdn\/shop\/files\/Moonriver_404_Reference_Front_2560.jpg?v=1740832540","variant_ids":[54990751695225,54990751793529,54990751891833,54990801535353,54990801568121,54990801600889,54990801633657,54990801666425,54990801699193]},"available":true,"name":"Moonriver Audio Reference 404 Integrated Amplifier - No DAC \/ No Phono Stage","public_title":"No DAC \/ No Phono Stage","options":["No DAC","No Phono Stage"],"price":449900,"weight":0,"compare_at_price":null,"inventory_management":"shopify","barcode":"","featured_media":{"alt":null,"id":64120037015929,"position":2,"preview_image":{"aspect_ratio":1.497,"height":1710,"width":2560,"src":"\/\/james-morrow.com\/cdn\/shop\/files\/Moonriver_404_Reference_Front_2560.jpg?v=1740832540"}},"requires_selling_plan":false,"selling_plan_allocations":[]},{"id":54990801535353,"title":"No DAC \/ + MM Phono Stage","option1":"No DAC","option2":"+ MM Phono Stage","option3":null,"sku":"","requires_shipping":true,"taxable":true,"featured_image":{"id":73392167518585,"product_id":14911971852665,"position":2,"created_at":"2025-03-01T12:35:36+00:00","updated_at":"2025-03-01T12:35:40+00:00","alt":null,"width":2560,"height":1710,"src":"\/\/james-morrow.com\/cdn\/shop\/files\/Moonriver_404_Reference_Front_2560.jpg?v=1740832540","variant_ids":[54990751695225,54990751793529,54990751891833,54990801535353,54990801568121,54990801600889,54990801633657,54990801666425,54990801699193]},"available":true,"name":"Moonriver Audio Reference 404 Integrated Amplifier - 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+ USB DAC \/ + MM Phono Stage","public_title":"+ USB DAC \/ + MM Phono Stage","options":["+ USB DAC","+ MM Phono Stage"],"price":574700,"weight":0,"compare_at_price":null,"inventory_management":"shopify","barcode":"","featured_media":{"alt":null,"id":64120037015929,"position":2,"preview_image":{"aspect_ratio":1.497,"height":1710,"width":2560,"src":"\/\/james-morrow.com\/cdn\/shop\/files\/Moonriver_404_Reference_Front_2560.jpg?v=1740832540"}},"requires_selling_plan":false,"selling_plan_allocations":[]},{"id":54990801699193,"title":"+ USB DAC \/ + MM\/MC Phono Stage","option1":"+ USB DAC","option2":"+ MM\/MC Phono Stage","option3":null,"sku":"","requires_shipping":true,"taxable":true,"featured_image":{"id":73392167518585,"product_id":14911971852665,"position":2,"created_at":"2025-03-01T12:35:36+00:00","updated_at":"2025-03-01T12:35:40+00:00","alt":null,"width":2560,"height":1710,"src":"\/\/james-morrow.com\/cdn\/shop\/files\/Moonriver_404_Reference_Front_2560.jpg?v=1740832540","variant_ids":[54990751695225,54990751793529,54990751891833,54990801535353,54990801568121,54990801600889,54990801633657,54990801666425,54990801699193]},"available":true,"name":"Moonriver Audio Reference 404 Integrated Amplifier - + USB DAC \/ + MM\/MC Phono Stage","public_title":"+ USB DAC \/ + MM\/MC Phono Stage","options":["+ USB DAC","+ MM\/MC Phono Stage"],"price":584700,"weight":0,"compare_at_price":null,"inventory_management":"shopify","barcode":"","featured_media":{"alt":null,"id":64120037015929,"position":2,"preview_image":{"aspect_ratio":1.497,"height":1710,"width":2560,"src":"\/\/james-morrow.com\/cdn\/shop\/files\/Moonriver_404_Reference_Front_2560.jpg?v=1740832540"}},"requires_selling_plan":false,"selling_plan_allocations":[]}],"images":["\/\/james-morrow.com\/cdn\/shop\/files\/Moonriver_404_Reference_Side_2560.jpg?v=1740832540","\/\/james-morrow.com\/cdn\/shop\/files\/Moonriver_404_Reference_Front_2560.jpg?v=1740832540","\/\/james-morrow.com\/cdn\/shop\/files\/Moonriver_404_Reference_Back_2560.jpg?v=1740832540"],"featured_image":"\/\/james-morrow.com\/cdn\/shop\/files\/Moonriver_404_Reference_Side_2560.jpg?v=1740832540","options":["DAC Stage","Phono Stage Options"],"media":[{"alt":null,"id":64120036950393,"position":1,"preview_image":{"aspect_ratio":1.497,"height":1710,"width":2560,"src":"\/\/james-morrow.com\/cdn\/shop\/files\/Moonriver_404_Reference_Side_2560.jpg?v=1740832540"},"aspect_ratio":1.497,"height":1710,"media_type":"image","src":"\/\/james-morrow.com\/cdn\/shop\/files\/Moonriver_404_Reference_Side_2560.jpg?v=1740832540","width":2560},{"alt":null,"id":64120037015929,"position":2,"preview_image":{"aspect_ratio":1.497,"height":1710,"width":2560,"src":"\/\/james-morrow.com\/cdn\/shop\/files\/Moonriver_404_Reference_Front_2560.jpg?v=1740832540"},"aspect_ratio":1.497,"height":1710,"media_type":"image","src":"\/\/james-morrow.com\/cdn\/shop\/files\/Moonriver_404_Reference_Front_2560.jpg?v=1740832540","width":2560},{"alt":null,"id":64120036983161,"position":3,"preview_image":{"aspect_ratio":1.5,"height":1707,"width":2560,"src":"\/\/james-morrow.com\/cdn\/shop\/files\/Moonriver_404_Reference_Back_2560.jpg?v=1740832540"},"aspect_ratio":1.5,"height":1707,"media_type":"image","src":"\/\/james-morrow.com\/cdn\/shop\/files\/Moonriver_404_Reference_Back_2560.jpg?v=1740832540","width":2560}],"requires_selling_plan":false,"selling_plan_groups":[],"content":"\u003ch2\u003eThe 404 Reference integrated amplifier\u003c\/h2\u003e\n\u003cp\u003eFollowing the runaway success of The Moonriver Model 404 (Standard), we decided to move a step further by improving on the already excellent design platform of the Standard 404 model. The Moonriver Model 404 Reference achieves even better performance over the Standard Model, while retaining a sensible price point.\u003c\/p\u003e\n\u003cp\u003eJust like the Standard Model 404, the 404 Reference amplifier will extract hidden elements, and render textures from within any audio format; but with the capability to drive any speaker on the market – despite its moderate power. Only the source, speakers and room will set the performance limit. Its culture will suit all music, as the Model 404 is by design, set to define the faintest nuances of which tonal integrity is composed.\u003c\/p\u003e\n\u003cp\u003eThe power supply section has been improved to the maximum. The 404 standard uses a total of 57000uf capacitance. The 404 Reference lifts the capacitance to a spectacular 107000uf of which 21000 of them are reserved for the preamp only.  This enormous increment expands the driving behaviour; the dynamic character; digs out more detail; low level information; a deeper and more articulate soundtstage; space between instruments is vast, while the bass has greater authority and is more confident than ever before.\u003c\/p\u003e\n\u003cp\u003eThe texture of each individual instrument is exposed exponentially in comparison with the Standard version. A fully discrete preamp section serves to provide acute dynamic awareness, while a high output stage that is custom-optimised for bandwidth and distortion, gives neutral character and transient fidelity. A sophisticated selection of components fuses the design against tonal traits, therefore preserving naturalness throughout the shortest feasible signal path.\u003c\/p\u003e\n\u003cp\u003eFurthermore, an integrated phono stage, USB DAC, (two) preamp outputs and a tape monitor loop expand functionality to form an ideally flexible integrated amplifier.\u003c\/p\u003e\n\u003ch2\u003eModular Architecture\u003c\/h2\u003e\n\u003cp\u003eMoonriver 404 Reference amplifier is modular like its brother; it can accommodate an MM or MM\/MC phono stage and a USB asynchronous DAC.  Fitting these modules is simple, and can take place at any time, on or after purchase.  The USB DAC may also be upgraded with a newer version to meet future needs and technologies.\u003c\/p\u003e\n\u003ch2\u003eBalance Control\u003c\/h2\u003e\n\u003cp\u003eYou may find this feature to be vanishingly scarce in audiophile products as a result of today’s ‘minimalist’ design mentality and the various myths accompanying it. However, balance control addresses a common problem: speakers that are positioned in asymmetry, in a non-balanced room environment. It therefore provides the simplest tweak towards achieving a proper soundstage.\u003c\/p\u003e\n\u003cp\u003eLiving rooms and house furniture are meant to serve everyday life and may not be positioned in an ideal listening spot, evenly distanced from each speaker to form an equilateral triangle. It is also not uncommon for one speaker to have to be placed nearer room boundaries than the other, having various frequencies boosted in a more or less predictable pattern. More often than not, balance control is incredibly useful as it drastically helps overcome volume level unevenness and in some cases, even reclaiming the stereo effect and the resulting focused sound stage.\u003c\/p\u003e\n\u003cp\u003eIt is to be expected, the way the balance control is implemented on the Moonriver 404 Reference amplifier – in parallel, will not degrade or affect the signal in any way that is determinable.\u003c\/p\u003e\n\u003ch2\u003eDiscovering the layout\u003c\/h2\u003e\n\u003cp\u003eModel 404 Reference, like the standard model, incorporates no less than 5 separate power supplies, each featuring overload protection. The power amplifier specifically runs on a dual mono configuration, beginning from separate windings on the toroidal transformer.\u003c\/p\u003e\n\u003cp\u003eWBT nextgenTM speaker terminals ensure the massive flow of current from the amplifier’s output stage, is able to drive even “difficult to drive” speakers.\u003c\/p\u003e\n\u003cp\u003eSignal switches are implemented via relays, while volume attenuation is trusted on the legendary blue ALPS pot.\u003c\/p\u003e\n\u003cp\u003eA soft start circuit based on a 30A relay ensures that even the on\/off switch is thought out to work with virtually no burden or wear for decades.\u003c\/p\u003e\n\u003cp\u003eThe 404 Reference chassis reduces unwanted resonant vibrations even further with absorbent materials, and better integral mechanical support.\u003c\/p\u003e\n\u003cp\u003eComponents are carefully selected for both suitability and reliability. We make no use of surface-mount in analog circuits, despite the fact that through-hole production costs more, and requires advanced space management \u0026amp; layout strategies.\u003c\/p\u003e\n\u003cp\u003eEach element utilised has to be of proven stability and sustained higher performance – proficient implementation provided, before making it into our analog paths.\u003c\/p\u003e\n\u003cp\u003eAs for the sound, we are not to say whether Model 404 Reference is virtually transparent or inherently forgiving. Voicing it to appreciate the playlist and respect the user at all times has been the sum of all of our effort; \u003cem\u003ea sincere effort to achieve effortlessness.\u003c\/em\u003e\u003c\/p\u003e\n\u003cdiv class=\"uncode_text_column\"\u003e\n\u003ch2\u003eOptional Phono Stage\u003c\/h2\u003e\n\u003cp\u003eModel 404 Reference comes with two options in the phono stage department; one is MM only and the other is MM\/MC selectable. Both follow the exact quality principles that Model 404 Reference is built on. Quality components and massive power supplies are also employed here, to efficiently accommodate very low noise, high performance op-amps.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"uncode_text_column\"\u003e\n\u003cp\u003eThe gain in the MM\/MC phono can be adjusted, simply by changing the dip switches position. The MC input load can be set also, by replacing the original 100 Ohm input resistor with a higher or lower value. No soldering is required.\u003c\/p\u003e\n\u003cdiv class=\"uncode_text_column\"\u003e\n\u003ch2\u003eOptional SPDIF DAC\u003c\/h2\u003e\n\u003cp\u003eThe add-on dac module is based on the 9000 series ESS Sabre dac chip. The SPDIF supports PCM streams up to 192kHz\/24bit due to the limitation of the SPDIF (coaxial) specifications. There are 3 separated power supplies with very low noise regulators, 2 for the ESS dac board and 1 for the analog circuit. The capacitor bank is massive and it uses 42000uF (in case of 404 Reference) from the power amplifier’s power supply.\u003c\/p\u003e\n\u003cp\u003eSpecially care has been given to the voicing of the analog output stage to match the dynamic and natural character of Moonriver sound. The result is an impressive sounding digital-to-analog converter which respects the timing, the space and the color of the music and unfolds the dynamic contrast – the definition of every musical event.\u003ca href=\"https:\/\/moonriveraudio.com\/the-404-reference-integrated-amplifier\/#\" class=\"inactive-link pushed\" data-lb-index=\"0\" tabindex=\"-1\"\u003e\u003c\/a\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"uncode_text_column\"\u003e\n\u003ch2\u003eOptional USB DAC\u003c\/h2\u003e\n\u003cp\u003eWhat was desired for our USB DAC module was not to make an addition rather than an omission; instead we had to be confident of substantially raising the true value and functionality of Model 404.\u003c\/p\u003e\n\u003cp\u003eThe add-on USB dac module is also based on the 9000 series ESS Sabre dac chip with native DSD support. The USB dac supports PCM up to 384kHz\/24bi and DSD up to 128. The USB input section is separated with discrete, very low drift clocks, XMOS input based chip with custom firmware. There are 5 separated power supplies with very low noise regulators, 2 for the USB board, 2 for the ESS dac board and 1 for the analog circuit. Specially care has been given to the voicing of the analog output stage to match the dynamic and natural character of Moonriver sound. The capacitor bank is massive and it uses 42000uF (in case of 404 Reference) from the power amplifier’s power supply.\u003c\/p\u003e\n\u003cp\u003eA new USB DAC for the Moonriver 404 Standard and Reference will be announced shortly.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e"}