The P-7300 inherits technology features and concepts of the 40th anniversary commemorative model A-200 and subsequent M-6200 and takes these even further. Some of the highlights are a drastic reduction in noise and a significant further improvement of the damping factor.
In the final stage, the parallel configuration of output devices ensures high current capacity and keeps the output impedance of the power amplifier extremely low. In addition, intensive research has culminated in an improved NFB loop with remote sensing, and the use of MOS-FET switches characterized by low ‘on-resistance’.
This further improves the ability to handle any speaker with competence, realizing constant-voltage drive even with extremely low load impedances. The guaranteed damping factor of at least 1,000 demonstrates the impressive success of this approach. In addition, by further refining the parallel drive and gain allocation of the input stage, Accuphase engineers were able to push the noise floor to previously unthinkable levels, achieving an amazing signal-to-noise ratio of 125 dB at maximum gain and 131 dB at the –12 dB gain setting.
Output stage with 10-parallel push-pull arrangement in each channel delivers ample power down to extremely low load impedances of 1 ohm
Amplification stage features low-noise instrumentation amplifier topology
Further refined MCS+ circuit
Current feedback principle combines excellent sound quality with total operation stability
Bridged connection mode allows upgrading to monophonic amplifier
4-stage gain control
Newly developed massive toroidal transformer with high power capacity
● 500 watts per channel into 2 ohms, 250 watts per channel into 4 ohms, 125 watts per channel into 8 ohms
●Total Harmonic Stereo operation (both channels driven) Distortion 0.05% with a 2 ohm load 0.03% with a 4 to 16 ohm load Monophonic operation (bridged connection) 0.05% with a 4 to 16 ohm load ● Intermodulation Distortion 0.01%
●Frequency Response At rated continuous average 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 (GAIN selector in MAX position) (Stereo/monophonic operation)
●Gain Selection –12 dB, –6 dB, –3 dB, MAX
● Output Load impedance Stereo operation: 2 to 16 ohms Monophonic operation: 4 to 16 ohms
●Damping Factor 1,000
●Input Sensitivity (with 8-ohm load, GAIN selector in MAX position) Stereo operation: 1.26 V for rated continuous average output 0.11 V for 1 watt output Monophonic operation: 2.52 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) 125 dB (GAIN selector in MAX position) 131 dB (GAIN selector in –12 dB position)
● Output Level Meters –40 dB to +3.0 dB (indication in dB and %) Logarithmic scale, with illumination off switch and sensitivity Peak hold time switchable 3 s, ∞
●Power Requirements 120/220/230 V AC, 50/60 Hz (Voltage as indicated on rear panel) ●Power Consumption 117 watts idle 820 watts in accordance with IEC 60065
●Maximum Dimensions Width 465 mm (18-5/16″) Height 238 mm (9-3/8″) Depth 515 mm (20-9/32″)
●Mass 48.6 kg (107.2 lbs) net 58.0 kg (127.1 lbs) in shipping carton