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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
hiend2's avatar
hiend2
400 posts
 
Why dont you try to drive the EQ unit with a preamp/ crossover output then feed the poweramp directly from the eq unit.
This will keep the EQ out of the high range amp and all the signal degrade to the less critical Lows.
I did this set up with the crown EQ-2 Equilizer unit with very good results driving krell amps and 801#3's. I dont know if your eq will drive the poweramp directly or not try and listen...
herman
2,238 posts
 
You stated "via balanced and unbalanced connection"

If you are using the Aleph 0 in balanced mode and the Aleph 3 in unbalanced, that is your problem. The Aleph P has 15 dB of gain using the balanced output, but only 9 dB using the unbalanced.

The only way I see to avoid using an attenuator is to use a splitter and drive both amps via their unbalanced inputs.
cadet1
50 posts
 
I BI-Amp the lows with a different amp and use a behringer parametric Eq to adjust the input sensitivity and equalize two room resonances. I realize I am putting another device between the preamp and bass amp, however the ability to have relatively flat in room bass responce far outways the negatives. (At least for me)Pipe organ is a joy without that 40Hz room resonance I used to have and I don't have to mess with the mids and treble.
sogood51
2,157 posts
 
I don't remember your gear...it's been a while. Can you switch inputs on the amps so that the extra gain from using balanced is on the upper freq's and not the bass. 3db is not a lot and may be able to be smoothed out a little from speaker placement with a pick-up of 1-2db in the bass freq's through room gain.

I usually don't post on gear I'm no longer up on but did use this type of approach at one time in a past setup...sounded much more in step so if no use with your problem...may help someone else latter.

Dave

Dave
sogood51
2,157 posts
 
I don't remember your gear...it's been a while. Can you switch inputs on the amps so that the extra gain from using balanced is on the upper freq's and not the bass. 3db is not a lot and may be able to be smoothed out a little from speaker placement with a pick-up of 1-2db in the bass freq's through room gain.

I usually don't post on gear I'm no longer up on but did use this type of approach at one time in a past setup...sounded much more in step so if no use with your problem...may help someone else latter.

Dave
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