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.

Does ANYONE know of a way to contact Behringer to find out WHO can repair both my PPA500BT's? Both are less than a year old and both are are doing what others describe. No output and flashing lights on panel. I appreciate the bullcrap Tribe stuff but enough of the cutsey crap. I need help and it does seem that the "Tribe" leaders could care less. 6 months and no response. AND IF I GET ONE MORE FILL OUT A FORM im going to blow up!

Who can fix? WHere are possible vendors that fix? Are PPA500BT's fixable or are they doorstops . Yes I'm pissed but nevertheless I feel someone at Behringer could help.

I've been asked to do an event this Spring with my EUROPORT PPA2000BT on an island with no power.  My questions are 1) what would be better a generator or an inverter/battery power source, and 2) would use of such a power source like this void any warranty??? 

Hello!

I have a Behringer V-Ampire LX1-112 amp, and I finally replaced the damaged dual jack input module (input and headphones), but somewhere along the way, the volume pot and red light power level display has stopped working. Not sure why; all connections are solid and the module is brand new. Neither the new module nor the old module make a difference to the power to the volume pot. All the other pots and red light levels show up on all the other knobs, but not the volume. Can someone please tell me what pot I need to find? Is there a specific model number? The replacement looks pretty straightforward, so I am happy to do some soldering and resoldering if needed. Thanks for all your help!!!

Jack