Khwarezm,
To get a 9db increase, you would need 8 time the power, and that is assuming the speaker itself does not begin to severely compress the signal (heating of the voice coil increases resistance) which it will do. The Proac speakers I have heard were quite efficient, so 175 watts would put them well into the point where speaker distortion, not the amp, would be a limitation.
To get a 9db increase, you would need 8 time the power, and that is assuming the speaker itself does not begin to severely compress the signal (heating of the voice coil increases resistance) which it will do. The Proac speakers I have heard were quite efficient, so 175 watts would put them well into the point where speaker distortion, not the amp, would be a limitation.