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Old 6th December 2001, 08:44 AM   #1
pkgum is offline pkgum  Australia
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are there any good sites in the internet about building this circuit?

once you had built the circuit how do you 'connect' it to the subwoofer?
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Old 6th December 2001, 09:07 AM   #2
ergo is offline ergo  Estonia
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How about this

http://www.linkwitzlab.com/thor-eq.htm

Ergo
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Old 6th December 2001, 11:33 AM   #3
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http://sound.westhost.com/linkwitz-transform.htm

you connect the circuit at the line level stage between the pre-amp and the power amp and of coarse, you must only feed the sub signal thru the circuit.

[Edited by AudioFreak on 12-06-2001 at 06:37 AM]
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Old 8th December 2001, 04:42 AM   #4
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Check this site out.
http://sound.westhost.com/project71.htm
Looks like it walks you through designing and implimenting a Linkwitz transform circuit.

I am thinking about going this route as well but have no electronics backround.

Does anyone know of a company that would solder up a custom circuit if you provided the PCB and the design???



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Old 12th December 2001, 09:01 AM   #5
pkgum is offline pkgum  Australia
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in a linkwitz circuit, can you boost the bass at ANY frequency?
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Old 12th December 2001, 11:38 AM   #6
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you can boost or attenuate the signal at any point so long as it is not below Fs and not above the breakup point of the speaker

[Edited by AudioFreak on 12-12-2001 at 04:49 PM]
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Old 12th December 2001, 03:22 PM   #7
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You can boost below the driver cutoff--that's kinda the whole point. I used to run subs about an octave and a half below their nominal 3dB point (from around 45Hz to about 16Hz). The trick is to precisely balance the circuit against the driver for flat response. Just keep an eye on Xmax and available amplifier power and you'll be fine.

Grey
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Old 14th December 2001, 10:30 AM   #8
pkgum is offline pkgum  Australia
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so if fs of the driver is 25Hz then i can't boost any frequency below that...right?

E.g I can boost the sound at 26Hz but not at 24Hz
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Old 14th December 2001, 12:08 PM   #9
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Well you can go below the Fs but you may then need a notch filter... also Xmax gets crazy ... you could go down to 10Hz if you want but SPL will suffer alot in order to stay inside Xmax and Pd.

If you post the t/s parameters of the driver you will be using and the rating of the amp we will be able to give you more information.

While your at it you'll probably also want to compensate for baffle diffraction loss.
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