C-2300 At A Glance

• Volume control: Balanced AAVA — current-domain summing volume with no moving wiper in the signal path
• Tone control: 4-band tone control with summing active filters (defeatable from the front panel)
• Inputs: 5 unbalanced line + 2 balanced (XLR) line; 2 expansion slots for option boards (phono AD-60, digital DAC-60)
• Outputs: Balanced (XLR) and unbalanced (RCA) line-level outputs, with phase-polarity setting memorized per input
• Construction: Independent power supplies and unit amplifiers for left and right channels
• Switching: Logic-controlled signal switching relays for shortest signal paths
• Volume sensor: High-accuracy, smooth-operation construction
• Headphone amplifier: Dedicated high-quality discrete-circuit headphone stage
• Expansion: Compatible with AD-60 phono board and DAC-60 digital input board

The C-2300 is the entry to Accuphase's separates ladder for line preamplifiers — the model a customer chooses when stepping out of the integrated-amplifier line (E-3000 through E-800S) and into discrete pre-and-power amplification, or when assembling a complete Accuphase system around a dedicated power amplifier (P-4600, P-7500, A-48S, A-80, or A-300 monos). It is not a cut-down preamplifier. It is the C-series taught with the same engineering discipline as the higher-tier C-2900 and the flagship C-3900S, scaled to the configuration that makes sense at the start of the separates line.

Balanced AAVA volume control. The AAVA volume control is Accuphase's distinguishing technology — a current-domain summing topology that has no resistor ladder, no moving wiper, and no measurable change in noise or distortion across its full range. Where conventional volume controls degrade signal quality as attenuation increases (because the signal passes through more of the resistor network at lower listening levels), an AAVA volume control behaves the same way at –40 dB as it does at –10 dB. The Balanced AAVA variant in the C-2300 maintains balanced signal handling end-to-end, preserving common-mode noise rejection that an unbalanced AAVA cannot provide. The same Balanced AAVA topology runs in the C-2900 and the C-3900S — at the C-2300 the implementation is single-circuit; the C-2900 doubles internal redundancy; the C-3900S applies the topology in a full dual-mono Dual Balanced AAVA arrangement.

4-band tone control — and why Accuphase still ships it. The C-2300 carries a 4-band tone control implemented through summing active filters, defeatable from the front panel when the listener wants the signal to bypass it entirely. Accuphase's argument for keeping tone controls in the chain — even at this price tier where high-end orthodoxy says "no tone controls" — is that recordings vary in their tonal balance more than they vary in any other dimension, and a precise tone control with low distortion is the difference between hearing a recording the way it was mastered and hearing it the way the listener's room and speakers happen to render it. The tone control is engineered to the same standard as the rest of the preamplifier; using it is a choice, not a compromise.

Independent left/right power supplies. The C-2300 runs each channel from its own power supply circuit — separate filtering, separate regulation, separate unit amplifier blocks. The same dual-mono principle that defines the higher-tier C-3900S is implemented here at the C-2300 level. Cross-channel modulation is minimized at the topological level rather than corrected after the fact by careful layout.

Five line + two balanced inputs, plus two expansion slots. The C-2300 provides five unbalanced line inputs and two balanced (XLR) inputs for line-level sources, plus two rear-panel expansion slots that accept Accuphase option boards. The AD-60 phono board adds full MC/MM phono capability — turning the C-2300 into a vinyl-capable preamplifier without a separate chassis. The DAC-60 digital input board adds USB and standard digital inputs for use with a server or streamer. Either board, or both, can be added at the time of purchase or retrofitted later.

Switching, sensor, and headphone amplifier. Input switching is implemented with logic-controlled relays for the shortest possible signal path — no rotary switch in the signal chain. The volume sensor mechanism is built for smooth, quiet operation, with positional accuracy that holds up across many years of operation. The headphone amplifier is a dedicated discrete-circuit stage — not an op-amp tapped from the main signal — so headphone listening is supported as a first-class output, not a secondary feature.

Where the C-2300 fits in the line. The C-2300 is the right line preamplifier for a customer pairing it with a P-4600 stereo amplifier, or with an A-48S in a Class A two-box configuration. Customers stepping up to the C-2900 gain a substantially larger expansion of input/output count, a Balanced AAVA running in a more elaborate configuration, and the option of the AD-2900 phono module (a higher-tier phono section than the AD-60 board). Customers stepping up further to the C-3900S gain the full Dual Balanced AAVA dual-mono construction and the lowest noise floor Accuphase publishes for any line preamplifier.

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