tivity of each amplifier channel pair simply and easily in just a few minutes using equipment which is commonly available. Necessary Equipment • Digital AC Voltmeter • CD with a sine•wave test tone recorded at 0 dB reference level in the frequency range to be amplified for that set of channels (50 Hz

fier channel pair simply and easily in just a few minutes using equipment which is commonly available in installation hays. Necessary Equipment • Digital AC Voltmeter • CD with a sine-wave test tone recorded at 0 dB reference level in the frequency range to be amplified %r that set of channels (50 Hz