Our power amplifier range have fixed gains of 27dB.
Our Pre-amps have different gains depending on the various models, which are as follows;
340A - 6dB
540A/640A V1 - 6dB
540A/640A V2 - 9dB
550A/650/651A - 9dB
740A - 9dB
840A V1/ V2 - 12dB
840E - 12dB
851A - 12dB
The pre-amp gain is added on to the power amp gain to get the total.
So, for example, the total gain for 640A v1 integrated is 33dB (27 + 6dB).
0dB represents the maximum gain of the system. So for an 840 product the pre/power amp gain is 39dB, when you set the volume to 0dB the system has the full gain of 39dB.