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Power amplifiers mono — Accuphase A-300
Description, images, technical data and specifications
Accuphase A-300
Image source - (c) Accuphase
The Accuphase A-300 is a mono power amplifier, one chassis per channel, built for a reference-level two-channel system rather than as a budget upgrade. Its main technical point is a very high damping factor, which gives it tight control over the loudspeaker load.
Key specs that matter
Rated output is 125W into 8 ohms, and the figure doubles to 250W into 4 ohms. The damping factor is 1000, among the higher numbers quoted for amplifiers of this type. Gain can be switched between 3, 6 and 12dB. Each monoblock measures 515 x 465 x 240mm and weighs 46kg, so a stereo pair is a substantial installation.
Engineering and use context
The switchable gain lets the A-300 match preamplifiers with different output levels without an external attenuator in the signal path. The doubling of power as the impedance halves shows that the output stage keeps delivering current into lower loads.
Pairing
The A-300 needs a preamplifier, and Accuphase makes its own line of preamplifiers for a matched system. Thanks to the gain settings the A-300 also copes with a later change of preamplifier, since a fixed-gain power amplifier can leave either too little or too much range on the volume control.
Key specs that matter
Rated output is 125W into 8 ohms, and the figure doubles to 250W into 4 ohms. The damping factor is 1000, among the higher numbers quoted for amplifiers of this type. Gain can be switched between 3, 6 and 12dB. Each monoblock measures 515 x 465 x 240mm and weighs 46kg, so a stereo pair is a substantial installation.
Engineering and use context
The switchable gain lets the A-300 match preamplifiers with different output levels without an external attenuator in the signal path. The doubling of power as the impedance halves shows that the output stage keeps delivering current into lower loads.
Pairing
The A-300 needs a preamplifier, and Accuphase makes its own line of preamplifiers for a matched system. Thanks to the gain settings the A-300 also copes with a later change of preamplifier, since a fixed-gain power amplifier can leave either too little or too much range on the volume control.
Specifications
Model name
A-300
Input sensitivity (mV)
N/A
Input impedance (balanced) (Ω)
N/A
Input impedance (single-ended) (Ω)
N/A
Output impedance (balanced) (Ω)
N/A
Output impedance (single-ended) (Ω)
N/A
Max current (A)
N/A
Output power (8Ω) (W)
125
Output power (4Ω) (W)
250
Gain (dBu)
3, 6, 12
Frequency response low +/- 3dB (Hz)
N/A
Frequency response high +/- 3dB (Hz)
N/A
Signal to Noise Ratio (dB)
N/A
Total Harmonic Distortion + Noise (0% global feedback) (%)
N/A
Total Harmonic Distortion + Noise (100% global feedback) (%)
N/A
Max power consumption (W)
N/A
Damping factor
1000
Dimensions (mm)
515 x 465 x 240
Weight (kg)
46.0
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