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Old 22nd May 2003, 02:45 AM   #1
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Cool Question on wiring: Sub Amp. Help a newb out!

I want to try and build another set of speakers, after finishing my home theater to much success. I'm not so hardcore as u guys, I love reading all the crazy stuff you try. I plan on building just L/R speakers. I am going to have a single cabinet w/ 2 chambers, 1 chamber on top for the two 6.5" and tweeter in D'Applito (sp?) configuration, and the 2nd chamber on bottom for a 12" side firing amplified subwoofer. Okay, How about the wiring, Im a newbie at this and I am confused. I will post:

I plan on using a subwoofer plate amp to drive the 12" on the bottom. How are some ways to wire the top speaks and the sub together? I cant think hard enough or know enough yet. I figure somehow: run the unamplified audio signal in the sub amp, it filters it and amps it for the sub, sends the higher freq signals back out, and then those go to the reciever input to be amped and sent to the top chamber speakers.

Or: ?
The sub amps all have line-level and speaker-level inputs. Speaker level inputs are for already amplified signals correct? (I think they have more interference but forget about that for now) So to make a simpler setup, can one just run the amplified audio from the reciever, to the sub to be filtered, and then the higher freq filtered signals directly to the top speakers? Cause I dont know how or if it can pass an amped signal through the sub and then keep the same amplification level on the output to the top speakers.

Or: (last one please read! thx! )
Run the amped signal from the reciever, to the top chamber speakers and their 3way x-over, and send the low freq filtered signal to the subwoofer amp speaker-level input?

Please help a confused man out! Or other ways to do this!
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Old 22nd May 2003, 05:04 AM   #2
sam9 is offline sam9  United States
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The means for taking speaker level output to a sub is basically just to tap it off with a high value resistor. Thus getting voltage but little current. Schematically, in the simplest arrangement the speaker level output doesn't necessarily "go through" the sub-amp, there is just a tee connection to the sub-amp (with the resistor mentioned above) while the full signal (voltage anf current) goes to the main speakers.

This often works because the natural roll-off of the speakers takes care of your high pass needs. In more complex situations, the speaker level signal can be high pass filtered as well. Some commercial powered subs provide a means to make a selection regarding which way you do it.

You can also have a line-level XO ahead of both the power amp for the main speakers and the sub amp.

I don't find either way better in a general sense, but the specifics of existing equipment and what you want to accomplish.
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Old 22nd May 2003, 05:31 AM   #3
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Hi, I'm doing the same thing.

What I have is a traditional crossover for the top box and nothing in the bottom sub box.

Then I take the preamp signal from my 5.1 for the front LR channel and put that thru an active crossover which splits the signal in two.

Then I feed the high signal back into my 5.1 Amp and then onto the top speaker while the low signal is put through another stereo amp and then onto the subwoofers.

I also have a Bassis equaliser in the subwoffer signal path (before amplification) to add additional response to the subwoofer (which also allows me to use a sealed and smaller box for the sub - no resonance peak to deal with ).

The active crossover and bassis come from www.marchandelec.com.


Tim.
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