Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Multi-Way Conventional loudspeakers with crossovers

Question on wiring: Sub Amp.  Help a newb out!
Question on wiring: Sub Amp.  Help a newb out!
Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Thread Tools Search this Thread
Old 22nd May 2003, 02:45 AM   #1
50joe is offline 50joe
diyAudio Member
Join Date: Nov 2002
Location: PA
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!
  Reply With Quote
Old 22nd May 2003, 05:04 AM   #2
sam9 is offline sam9  United States
diyAudio Member
sam9's Avatar
Join Date: Jun 2002
Location: Left Coast
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.
  Reply With Quote
Old 22nd May 2003, 05:31 AM   #3
tim_rule is offline tim_rule  Australia
diyAudio Member
Join Date: Apr 2002
Location: Melbourne
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.

  Reply With Quote


Question on wiring: Sub Amp.  Help a newb out!Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Newb with a sub plate question.... winkyhead Subwoofers 0 31st March 2008 11:09 PM
Newb question bushroot Chip Amps 3 6th October 2006 05:31 PM
Stupid newb question. gvr4ever Multi-Way 1 14th August 2006 03:16 AM
newb question v1d9uy Subwoofers 2 11th January 2006 11:53 PM
Very newb question jaws2421 Solid State 7 29th December 2005 05:46 PM

New To Site? Need Help?

All times are GMT. The time now is 09:44 AM.

Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 16.67%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright ©1999-2017 diyAudio