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View Full Version : Pls Help w/ my 3-Way Bi-Amp Scheme


rlschow
08-16-2011, 04:13 PM
I'm going to try bi-amping per the attached diagram below. This is an edit of the schematic in 4313B's post on 12/31/06 (http://www.audioheritage.org/vbulletin/showthread.php?166-4333-S300-L300-equivalent-bandbass-circuit&p=140919&viewfull=1#post140919). I've just added the charge coupling, as I understand it, to his drawing. Did I get it right? Will this network be good with 2441's as I've shown?

What is the purpose of the 20uf cap and 10ohm resistor across the LF signal?
John W
08-17-2011, 07:29 AM
This is Zobel network that flattens the rising woofer impedance.

http://www.trueaudio.com/st_zobel.htm

This shouldn't be needed when biamping.
badman
08-17-2011, 08:14 AM
This is Zobel network that flattens the rising woofer impedance.

http://www.trueaudio.com/st_zobel.htm

This shouldn't be needed when biamping.


Agreed. You got the cap values right, too. So you're golden!
rlschow
08-17-2011, 11:48 AM
This is Zobel network that flattens the rising woofer impedance.

http://www.trueaudio.com/st_zobel.htm

This shouldn't be needed when biamping.
Aha! Thank you very much for the link. Great explanation.


Agreed. You got the cap values right, too. So you're golden!


Badman, I appreciate the confirmation.

Time to order some parts!
Ruediger
08-17-2011, 11:51 AM
... for the bass, and if the midrange amp ain't tubes, then for the midrange as well.

Ruediger
rlschow
08-18-2011, 09:06 AM
... for the bass, and if the midrange amp ain't tubes, then for the midrange as well.

Ruediger
The midrange will be amplified with tubes. If I were to protect the woofers from the possibility of my amp going DC, I think I'd do it with a relay circuit. Do I really need to worry about turn-on transients with the woofers? I'd rather put a mechanical switch in the speaker wire, than try to find a capacitor big enough to do that.
more10
08-18-2011, 02:58 PM
No need to worry about turn on transients on the woofers. Myself I have quad-amped with no protection for woofer and 8" midrange.

But you should always turn on preamp and crossover before power amps, and the reverse when turning off, with a delay to let the juice out of the power amps. It will save your ears.
Ruediger
08-20-2011, 12:00 PM
No need to worry about turn on transients on the woofers. Myself I have quad-amped with no protection for woofer and 8" midrange.

But you should always turn on preamp and crossover before power amps, and the reverse when turning off, with a delay to let the juice out of the power amps. It will save your ears.

Right! What I wrote was silly :) You need DC protection only for the midrange, if it's not tube, cause that has a transformer which does not pass DC.