below is an amplifier's specification listed in a government Tender spec. that's been released recently.
AMPLIFICATION AND CONTROL EQUIPMENT is Limtied to the following
A. Microphone Inputs: Two low impedance input with 600 microvolt sensitive and noise level at least 55 db below rated output.
B. Auxiliary Inputs: One high impedance input with 0.4 volt sensitivity and noise level at least 70 dB below rated output.
C. System Frequency Response: 70 – 18,000 Hz., minus 3 dB.
D. Harmonic Distortion: Less than 0.5 percent, at 1 kHz. at rated power.
E. System Output Power: Minimum 1500 W.
F. Volume Controls: One for each input, one master volume and for individual zones.
G. Bass Control: +8 dB to -12 dB at 50 Hz.
H. Treble Control: +8 dB to -12 dB at 10,000 Hz.
I. Program Selector: Provide program and mode selector switches.
I had searched for an amplifier that can match all the above but didnt find any and any equivelant will not be acceptable.