Accuphase P-6100 Power Amplifier



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Stereo power amplifier with power MOS-FET devices

The Class AB Monophonic Power Amplifier M-6000 using power MOS-FETs in its output stage has been highly acclaimed both in Japan and abroad for its excellent sound quality and performance. The P-6100 is a stereo version of this model, inheriting its outstanding design technology. It features instrumentation amplifier topology and a further refined MCS+ circuit, as well as the current feedback principle to minimize noise. Only specially selected top-grade materials and parts are used throughout. The result is a high-end stereo amplifier that is bound to impress. In the output stage, high-power MOS-FET devices renowned for their great sound and utter reliability are used. MOS-FETs have excellent frequency response and high input impedance which reduces the load on the preceding driver stage. They also have perfect thermal stability. In each channel of the P-6100, 16 of these devices are arranged in an 8-parallel push-pull configuration. This brings out the musical potential inherent in the source with absolute clarity and stunning authority.

The massive heat sinks on both sides of the chassis achieve efficient dissipation of thermal energy and ensure stable operation. This allows the amplifier to deliver an amazing 700 watts of power per channel into an ultra-low impedance load of 1 ohm (music signals). The linear power progression with a rating of 440 watts into 2 ohms, 220 watts into 4 ohms, and 110 watts into 8 ohms means that the amplifier can competently handle even speakers with very low impedance or with difficult impedance curves. Using the P-6100 in bridged mode creates a monophonic amplifier with even more impressive power capability, rated for 1400 watts into 2 ohms (music signals). This performance is sustained by a massive high-efficiency toroidal transformer housed in an aluminium enclosure with heat dissipation fins and complemented by two large 56,000 μF filtering capacitors. Even the most stringent power demands are easily met by this configuration.

Further refined MCS+ topology for even lower noise

Accuphase's original MCS (Multiple Circuit Summing) principle uses a number of identical circuits connected in parallel to achieve superior performance characteristics. MCS+ is a further refined version of this approach. Improvements in the bias circuitry of the input-stage buffer amplifier result in greater stability. This in turn makes it possible to extend the parallel operation approach to the class-A drive stage of the current/voltage converter, thereby further lowering the noise floor.

Powerful Amplification

Power amplifier assembly with 8 parallel push-pull power MOS-FET transistor pairs per channel mounted directly to large heat sinks, MCS+ circuitry, and current feedback amplifier

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Continuous Average Output Power: Stereo operation - 700 watts per channel into 1 ohm, 440 watts per channel into 2 ohms, 220 watts per channel into 4 ohms, 110 watts per channel into 8 ohms. Monophonic operation (bridged connection) - 1400 watts into 2 ohms, 880 watts into 4 ohms, 440 watts into 8 ohms. 

Total Harmonic Distortion: Stereo operation - 0.05% with 2 ohm load, 0.03% with 4 to 16 ohm load. Monophonic operation (bridged connection) - 0.03% with 4 to 16 ohm load

Intermodulation Distortion: 0.01%

Frequency Response: At rated output: 20 – 20,000 Hz +0, -0.2 dB. At 1 watt output: 0.5 – 160,000 Hz +0, -3.0 dB

Gain: 28.0 dB (with GAIN selector at MAX) (Stereo and monophonic operation)

Gain Selection: MAX, -3 dB, -6 dB, -12 dB

Output Load impedance: Stereo operation - 2 to 16 ohms. Monophonic operation: 4 to 16 ohms

Damping Factor: 500

Input Sensitivity (with 8-ohm load, GAIN selector in MAX position): Stereo operation - 1.18 V for rated continuous average output. 0.11 V for 1 watt output. Monophonic operation - 2.36 V for rated continuous average output. 0.11 V for 1 watt output

Input Impedance: Balanced - 40 kilohms. Line - 20 kilohms

Signal-to-Noise Ratio (A-weighted, input shorted): 120 dB (GAIN selector at MAX), 125 dB (GAIN selector at -12 dB) At rated continuous average output

Output Level Meters: Logarithmic compression type; illumination turn-off capability; -60 dB to +3 dB (indication in both dB and %); switchable peak hold time: 3 sec, ∞

Power Requirements: AC 120 V/230 V, 50/60 Hz (Voltage as indicated on rear panel)

Power Consumption: 170 watts idle. 670 watts in accordance with IEC 60065

Maximum Dimensions: Width 465 mm, Height 221 mm, Depth 499 mm

Mass: 42.7 kg net, 51.0 kg in shipping carton