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
sony OP
22 posts
 
Herman, you're right! I've confirmed the "problem" is the pre-amplifier. According to Pass Aleph P manual, Gain: 15dB balanced out; 9dB unbalanced out.

So, we're talking about a 6dB difference!

Cadet1, what's the model/price of the behringer parametric Eq?
cadet1
50 posts
 
Behringer PEQ 2200 Ultra-Q 5 band parametric. On sale at parts express for $69.99. These are mono so you would need 2. very good for the money. In case you are wondering, my syster is proceed electronics and revel M-20 speakers with DIY subs which are equalized. I hope to soon get revel studio's and passively bi-amp and eq the woofer section below 200 Hz. Parts express has a return policy so you can't go wrong.
drrdiamond
671 posts
 
An easier solution:

Whatever interconnects you are using, contact the company and they can make you a balanced Y splitter so that the output of the amps will be the same. Feeding both amps balanced will probably also give you better sound.

Richard
herman
1,974 posts
 
The Aleph 3 doesn't have balanced inputs
sony OP
22 posts
 
Herman, that's right - only the Aleph 0s has balanced inputs.

Drrdiamond, could I extract the signal of the balanced output of the preamplifier and split it into a balanced and unbalanced connection? (one XLR to one XLR and one RCA)

Another reason for doing so is that I will have more power in the end than attenuating the signal to the bass amplifier.

Cadet1, I must say that my bass section is not a sub-bass one (200Hz), since it will be handling frequencies up to 2.5KHz, so there's a lot of midrange there. Couldn't the eq spoil it a bit?
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