{"product_id":"accuphase-c-3900s","title":"Accuphase C-3900S Precision Stereo Preamplifier","description":"\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.375rem] font-bold\"\u003eAccuphase C-3900S Precision Stereo Preamplifier\u003c\/h2\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003e\u003cem\u003eA flagship dual mono preamplifier built around Accuphase's Dual Balanced AAVA volume control, designed to pass a signal through with as little alteration as possible.\u003c\/em\u003e\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003e\u003cstrong\u003eA Different Way to Control Volume\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003eEvery preamplifier has one job that sounds simple and is not: turning the volume up and down without changing anything else about the signal. Most designs use a resistor based volume control or a potentiometer, and both approaches introduce small but real side effects as you turn the knob, including shifts in impedance and subtle changes to frequency response. Accuphase took a different path more than two decades ago with AAVA, the Accuphase Analog Vari Gain Amplifier, which removes resistor based attenuation from the signal path entirely. Instead of reducing the signal, AAVA adjusts volume by combining voltage to current conversion circuits of different gain. The result is a volume control that does not alter impedance or frequency response as you move through the range, and a noise floor that stays remarkably consistent whether you are listening late at night at low levels or pushing the system at a party. The C-3900S represents the most refined version of this idea Accuphase has built, called Dual Balanced AAVA, which runs two complete balanced AAVA circuits in parallel for each channel. Accuphase states this configuration delivers a thirty percent reduction in noise compared to the standard Balanced AAVA circuit used in earlier models, which is a meaningful gain in a part of the signal chain that is notoriously difficult to improve once you have already gotten it quiet.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003e\u003cstrong\u003eANCC and the Pursuit of a Lower Noise Floor\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003eSitting alongside Dual Balanced AAVA is a second technology called ANCC, short for Accuphase Noise and Distortion Canceling Circuit. Think of ANCC as a second, dedicated low noise amplifier whose only job is to listen for noise and distortion generated by the main amplification stage and cancel it out before it reaches your ears. Accuphase built ANCC directly into the Dual Balanced AAVA voltage to current conversion stage, and the practical benefit shows up most clearly during the transition from very low volume settings to normal listening levels, which is exactly the range where noise is hardest to hide and easiest to hear. The published specifications back this up in a way that matters to a trained ear and a measurement bench alike, with a signal to noise ratio of 118 dB and total harmonic distortion of just 0.005 percent across the full 20 Hz to 20,000 Hz audible range. Numbers like these do not guarantee a particular sound, but they tell you Accuphase engineered this preamplifier to disappear into the system rather than impose its own character on the music.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003e\u003cstrong\u003eDual Mono Construction From the Power Supply Up\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003eThe C-3900S commits to a true dual mono architecture rather than treating it as a marketing checkbox. Each channel gets its own toroidal power transformer and its own bank of filtering capacitors, twelve in total at 10,000 microfarads each, split evenly between left and right. Each channel also has its own discrete amplifier circuitry built on circuit boards made from glass cloth fluorocarbon resin, a substrate chosen specifically for its low dielectric constant and minimal signal loss compared to standard fiberglass boards. Keeping the channels physically and electrically separate all the way from the wall outlet to the output jacks reduces crosstalk between left and right, which Accuphase rates at an excellent negative 90 dB at 10 kHz. The practical result for a listener is a wider, more stable stereo image, because the two channels are not fighting each other for current or interfering through a shared power supply the way they can in simpler designs.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003e\u003cstrong\u003eThe Volume Knob Itself Is a Precision Instrument\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003eIt is easy to overlook the physical volume knob on a preamplifier this sophisticated, but Accuphase clearly did not. The C-3900S uses a volume sensor that Accuphase designs and machines in house from a solid block of aluminum, built to detect the angular position of the knob with extreme precision. The knob itself has a deliberately weighted, solid feel when you turn it by hand, and when you use the included RC-260 remote, a small motor drives the knob through a set of gears rather than relying on an electronic stepped attenuator alone. Accuphase engineered those gears to maintain constant pressure as they mesh, which is why the motorized volume adjustment is nearly silent rather than producing the whirring or clicking sound you get from many remote controlled preamplifiers. It is a small detail, but it reflects the same philosophy you see throughout this preamplifier, where Accuphase chose to solve a problem mechanically and precisely rather than paper over it electronically.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003e\u003cstrong\u003eConnectivity, Flexibility, and Where the C-3900S Fits in a System\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003eThe rear panel of the C-3900S is generous without being overwhelming. You get six unbalanced line level inputs, four balanced XLR inputs, two unbalanced line outputs, and two balanced XLR outputs, along with a dedicated set of recorder play and record connectors for anyone running a reel to reel or other recording device through the system. There are also external preamplifier inputs in both balanced and unbalanced form, which let you loop in an outboard processor or alternate preamplifier section without disturbing the rest of your connections. One detail that trips up first time Accuphase buyers deserves a direct answer here. The C-3900S does not include a phono stage and cannot accept a turntable directly into a standard line input. Accuphase designed this preamplifier as a pure line stage, and the company's own recommended pairing for vinyl playback is the separate C-57 Stereo Phono Amplifier, which connects into the C-3900S through either the line level or balanced external preamp inputs. If you listen to vinyl, plan on the C-57 or another standalone phono stage as part of your system from the start.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003eIt is worth placing the C-3900S against Audio Technica's phono focused lineup here, not because the two compete directly, but because the comparison clarifies what each company actually builds. Audio Technica's strength is in cartridges and phono preamplification, including models like the AT-PEQ30, which exist to take a delicate phono signal and bring it up to line level cleanly and affordably. The C-3900S sits at the opposite end of the signal chain and the price spectrum. It assumes a clean line level signal is already arriving at its inputs, whether from a phono stage, a digital source, or another preamplifier, and its entire engineering focus goes into controlling and routing that signal with as little alteration as possible. A system built around the C-3900S for vinyl playback would still rely on something like an Audio Technica cartridge upstream and a dedicated phono stage such as the Accuphase C-57 before the signal ever reaches the C-3900S itself.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003e\u003cstrong\u003eHeadphone Amplification and Everyday Controls\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003eBeyond its role as a line stage, the C-3900S includes a genuinely capable headphone amplifier built with discrete parallel push pull output stages rather than a simple op amp tap off the main circuit. It offers three selectable gain settings, low, mid, and high, so you can match the amplifier's output to headphones ranging from easy to drive to genuinely demanding planar designs, with roughly plus or minus 10 dB of adjustment around the mid setting. The front panel and remote also give you a five stage loudness compensator for low volume listening, a left and right balance control with notably fine adjustment steps, the ability to fold stereo sources down to mono, and a quick attenuator button that drops output by 20 dB instantly if a phone rings or someone walks in during a critical listening session. None of these features are flashy on a spec sheet, but they are the kind of details that make a preamplifier pleasant to live with every single day rather than just impressive on paper.\u003c\/p\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch3 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\"\u003eKey Specifications\u003c\/h3\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003eBrand: Accuphase\u003cbr\u003eModel: C-3900S\u003cbr\u003eCategory: Precision Stereo Preamplifier\u003cbr\u003eVolume Control: Dual Balanced AAVA with ANCC\u003cbr\u003eInputs: 6 line level (RCA), 4 balanced (XLR)\u003cbr\u003eOutputs: 2 line level (RCA), 2 balanced (XLR)\u003cbr\u003eAdditional Connections: Recorder play and record, external preamp inputs (balanced and unbalanced)\u003cbr\u003ePhono Input: None built in. Requires external phono stage such as the Accuphase C-57\u003cbr\u003eGain: Switchable 12 dB, 18 dB, or 24 dB\u003cbr\u003eFrequency Response: 20 Hz to 20,000 Hz, +0\/-0.2 dB\u003cbr\u003eTotal Harmonic Distortion: 0.005 percent (20 Hz to 20,000 Hz at rated output)\u003cbr\u003eSignal to Noise Ratio: 118 dB (balanced and line)\u003cbr\u003eCrosstalk: -90 dB at 10 kHz\u003cbr\u003eHeadphone Output: 2V at 40 ohms, suitable for headphones rated 8 ohms or higher, with LOW\/MID\/HIGH gain selection\u003cbr\u003ePower Requirements: 120V, 220V, or 230V AC, 50\/60 Hz (version specific)\u003cbr\u003ePower Consumption: 60W\u003cbr\u003eDimensions: 18.8 inches wide x 6.1 inches high x 16.2 inches deep (477mm x 156mm x 412mm)\u003cbr\u003eNet Weight: 55.8 lbs (25.3 kg)\u003cbr\u003eShipping Weight: 73 lbs (33 kg)\u003cbr\u003eFinish: Champagne gold front panel, natural grain wood cabinet\u003cbr\u003eIncluded Accessories: AC power cord, audio cable, RC-260 Remote Commander, cleaning cloth\u003cbr\u003ePrice: Call All Elite Audio for current pricing\u003cbr\u003eWarranty: Manufacturer warranty through authorized Accuphase dealer network. Call All Elite Audio for full terms\u003c\/p\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch3 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\"\u003eWhy Buy From All Elite Audio\u003c\/h3\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003eAll Elite Audio is an authorized Accuphase dealer, which means every C-3900S we sell is backed by genuine manufacturer support and a full factory warranty, not a gray market unit with no service path. We set up and listen to every preamplifier we sell before it leaves our store, and we will walk you through matching the C-3900S with the right phono stage, power amplifier, and cabling for your specific system rather than just shipping a box. If you are local to the Baltimore area, come hear it in person on a real system before you decide.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003eCall: 443-402-5055\u003cbr\u003eText: 443-402-5064\u003cbr\u003eVisit: 1921 York Rd, Timonium, MD 21093\u003c\/p\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch3 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\"\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003e\u003cstrong\u003eDoes the Accuphase C-3900S have a built in phono preamp?\u003c\/strong\u003e\u003cbr\u003eNo, the C-3900S is a pure line stage preamplifier and does not include a phono input or phono preamplification of any kind. It is built around balanced and unbalanced line level inputs only, plus external preamp connections, all of which expect a signal that is already at line level. If you plan to play vinyl through this preamplifier, you will need a separate phono stage between your turntable and the C-3900S. Accuphase specifically designed and recommends its own C-57 Stereo Phono Amplifier for this purpose, and the two units connect cleanly through either the line level or balanced external preamp inputs.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003e\u003cstrong\u003eDoes the C-3900S come with a cartridge or turntable?\u003c\/strong\u003e\u003cbr\u003eNo, the C-3900S is a line stage preamplifier and ships with no turntable, cartridge, or phono related hardware at all. The included accessories are limited to the AC power cord, an audio cable, the RC-260 remote control, and a cleaning cloth. A complete vinyl front end for this preamplifier requires a turntable, a cartridge, and a separate phono stage such as the Accuphase C-57, all purchased independently. We are happy to help you build out that entire chain so everything matches the resolution this preamplifier is capable of.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003e\u003cstrong\u003eHow does the C-3900S compare to the original Accuphase C-3900?\u003c\/strong\u003e\u003cbr\u003eThe C-3900S is a refined version of the C-3900, using the same dual mono chassis and overall layout but with updated internal technology. The most significant change is the addition of ANCC, the Accuphase Noise and Distortion Canceling Circuit, layered into the Dual Balanced AAVA volume stage to further reduce noise and distortion, particularly when moving from low to moderate listening levels. If you already own a C-3900 and are happy with it, the upgrade to the C-3900S is an incremental refinement rather than a fundamental redesign. For a new purchase, the C-3900S represents the current state of the art in this product line and is the version we recommend.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003e\u003cstrong\u003eWhat does AAVA actually mean for how this preamplifier sounds?\u003c\/strong\u003e\u003cbr\u003eAAVA stands for Accuphase Analog Vari Gain Amplifier, and it describes how the C-3900S handles volume control without using a traditional resistor based volume pot. Conventional volume controls work by reducing the signal through variable resistance, which can subtly shift impedance and frequency response depending on where the knob is set. AAVA instead adjusts gain by combining voltage to current conversion circuits, so the signal path itself does not change character as you turn the volume up or down. In the C-3900S, this is taken further with Dual Balanced AAVA, which runs two complete balanced AAVA circuits per channel for an additional reduction in noise compared to earlier Accuphase preamplifiers.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003e\u003cstrong\u003eWhat is the difference between the line inputs and the balanced inputs?\u003c\/strong\u003e\u003cbr\u003eThe line inputs use standard unbalanced RCA connections, which are the most common connection type on consumer audio gear and work fine over shorter cable runs in a typical home system. The balanced inputs use XLR connectors and carry the signal differently, with the audio split across two conductors that are out of phase with each other so that any noise picked up along the cable run gets canceled out at the receiving end. Balanced connections are generally the better choice when you have longer cable runs, when your source component also offers balanced outputs, or when you are dealing with an electrically noisy room. The C-3900S supports both, with six line level inputs and four balanced inputs, so you are not forced to choose one connection type for your entire system.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003e\u003cstrong\u003eWhat does the gain selector switch actually change?\u003c\/strong\u003e\u003cbr\u003eThe C-3900S includes a switchable overall gain setting of 12 dB, 18 dB, or 24 dB, which controls how much the preamplifier amplifies the incoming signal before it reaches your power amplifier. A lower gain setting is generally appropriate when your source components already put out a strong signal or when your power amplifier is highly sensitive, since it gives you more usable range on the volume knob before the system gets uncomfortably loud. A higher gain setting helps when you are working with lower output sources or a power amplifier that needs more drive to reach full output. We can help you choose the right setting based on the rest of your system during setup.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003e\u003cstrong\u003eWhat else do I need to build a complete system around the C-3900S?\u003c\/strong\u003e\u003cbr\u003eAt minimum, you will need a power amplifier to follow the C-3900S, since it is a preamplifier only and does not drive speakers directly, along with speakers matched to that amplifier's output and your room size. If you intend to play vinyl, add a turntable, a cartridge, and a separate phono stage such as the Accuphase C-57. You will also want good quality balanced or unbalanced cabling between each component, matched to the connection types your specific source and amplifier support. We routinely help customers plan out a complete system around the C-3900S rather than selling it as an isolated piece, and we would rather get the system right than sell you one expensive box.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003e\u003cstrong\u003eCan I use the C-3900S with amplifiers from other brands, or only Accuphase power amplifiers?\u003c\/strong\u003e\u003cbr\u003eThe C-3900S is fully compatible with power amplifiers from other manufacturers, since it communicates through standard balanced XLR and unbalanced RCA connections rather than any proprietary Accuphase only interface. Many owners do choose to pair it with an Accuphase power amplifier for a matched aesthetic and a manufacturer optimized combination, and there is a real benefit to staying within one ecosystem when it comes to overall system voicing. That said, the C-3900S will perform well driving high quality power amplifiers from other respected brands, and we can help you audition a few combinations to find what suits your speakers and your room.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003e\u003cstrong\u003eWhy is the headphone amplifier in this preamplifier worth paying attention to?\u003c\/strong\u003e\u003cbr\u003eThe headphone section in the C-3900S is not an afterthought tacked onto the main circuit, it is a discrete parallel push pull design built specifically for driving headphones well. It includes three selectable gain settings, low, mid, and high, so you can properly match the amplifier's output to headphones of different sensitivities, from easy to drive models up to more demanding planar magnetic designs. The output is rated at 2 volts into 40 ohms and is suitable for headphones with an impedance of 8 ohms or higher, which covers the overwhelming majority of high end headphones on the market. If you split your listening time between speakers and headphones, this preamplifier genuinely covers both well rather than treating headphone output as a minor convenience feature.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003e\u003cstrong\u003eWhere can I buy the Accuphase C-3900S?\u003c\/strong\u003e\u003cbr\u003eAll Elite Audio is an authorized Accuphase dealer and carries the C-3900S in stock at our Timonium, Maryland location, where you can listen to it on a real system before deciding. You can call us at 443-402-5055 with any questions about pricing, current availability, or how it pairs with the rest of your system, or text us at 443-402-5064 if that is easier for you. You are also welcome to visit us in person at 1921 York Rd, Timonium, MD 21093 to hear the C-3900S yourself rather than relying on a spec sheet alone. As an authorized dealer, every unit we sell comes with full manufacturer support and a genuine factory warranty.\u003c\/p\u003e","brand":"Accuphase","offers":[{"title":"Default Title","offer_id":44571156742197,"sku":null,"price":38975.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0632\/1704\/1461\/files\/1_c7cf669f-b632-4864-b0f0-7172cdfcc7d7.png?v=1781808005","url":"https:\/\/alleliteaudio.com\/products\/accuphase-c-3900s","provider":"All Elite Audio","version":"1.0","type":"link"}