2. amps-preamps
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How to equalize a bi-amplification setup?

Greetings!

Any one experienced in bi-amplification setups with different amplifiers, where output must be equalized?

In my bi-amp setup I use one pre-amplifier connected two different amplifiers, via balanced and unbalanced connection, feeding a pair of 2-ways loudspeakers (Pass Aleph P, Pass Aleph 3 on tweeter and Pass Aleph 0s on woofer).

Problem is the Aleph 0s results in a final higher sound volume (at least +3dB). Theorically I think this should not happen as manual gain of both amplifiers indicate a +20dB gain, altough the Aleph 0s outputs much more current.

How can I "calm down" the bass amp without comprimising the sound quality and without opening the loudspeaker to introduce one attenuation circuit?
sony
cadet1
50 posts
 
sony,
Personally, I'd be uneasy about going up that high. In my present system the signal is only EQ'd below 100Hz.Something like EVS attenuators would probably work better for this application,I used to have a pair of these and they work extremely well. Only one series resistor in the signal path and one shunting to ground.
drrdiamond
671 posts
 
Sony,

Unfortunately, no.

Sorry
sony OP
22 posts
 
From Nelson Pass I received an excellent tip that applies to this or other setup:

Connecting preamplifier balanced output to the amplifiers unbalanced inputs: pin 3 for Amp1, pin 2 for Amp2; both share pin 1 ground; phase of amp1 inverted at the speaker output.

If Amp1 has more gain than amp2, put pin 3 into a 10K pot.

Voila! Simple and brilliant.
tadtone
8 posts
 
Have you look into an active crossover? Multi-amp system really need an active crossover to be done correctly.
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