Behringer KM750 specifications state a voltage gain of 32dB. However, if we do the math, the published voltage gain value doesn't add up.
The specifications states that the KM 750 delivers 200 watts into 8 ohms with an input sensitivity of 0.775 Volts.
Output voltage formula: sqrt (power x impedance)
Output voltage calculated: sqrt (200 x 8) = 40V
Voltage gain (amplification factor): output voltage / input voltage = Av (amplification factor)
Voltage gain (amplification factor) calculated: 40 V / 0.775 V = 51.62
Voltage gain (dB) formula: 20log(Av)
Voltage gain (dB) calculated: 20log(51.61) = 34.25 dB
The calculated voltage gain is 2 dB higher than the specified voltage gain.
The only scenario the specified voltage gain is 32 dB is if the input sensitivity is, in fact, 1 Volt.
So, the following question arises: when input sensitivity of 0.775 V is selected, the maximum input voltage required for maximum rated power is 0.775 V (0 dBU) or 1 V (+2 dBU)?
The following scenario applies to Behringer KM 1700, also.
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Hello!
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Jack
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