How? 2 stereo tweeters but only one woofer - diyAudio
Go Back   Home > Forums > Loudspeakers > Multi-Way

Multi-Way Conventional loudspeakers with crossovers

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
Reply
 
Thread Tools Search this Thread
Old 27th May 2013, 05:43 PM   #1
Pdwhitt is offline Pdwhitt  United States
diyAudio Member
 
Join Date: Apr 2012
Default How? 2 stereo tweeters but only one woofer

I am building a small boombox, using a stereo amp, with (2) 3" tweeters, but I only have room for one woofer. I want to maintain the stereo output of the two tweeters. My amp only has two stereo outs, no mono out. How do I wire the single woofer?
  Reply With Quote
Old 27th May 2013, 05:50 PM   #2
diyAudio Member
 
Join Date: Sep 2004
Location: Minneapolis, Minnesota, USA
No easy way to do that. It would make more sense to forget tweeters and woofers, and just go with a couple of small full range drivers instead.

Mike
  Reply With Quote
Old 27th May 2013, 10:41 PM   #3
diyAudio Member
 
Join Date: Jun 2003
Location: Menlo Park, CA
Use a dual voice coil woofer or sum the amplifier outputs with a transformer.
  Reply With Quote
Old 27th May 2013, 10:50 PM   #4
dangus is offline dangus  Canada
diyAudio Member
 
Join Date: May 2004
Location: Vancouver Island
Use 4 ohm stable amps and wire the woofer bridged. This requires inverting the phase of one channel, and reversing the polarity of one mid/tweeter. Also, that the amps are not already bridged (as most digital amps and "high power" linear amps that run from 12V are).
  Reply With Quote
Old 23rd July 2013, 01:51 PM   #5
diyAudio Member
 
Join Date: Jul 2013
Quote:
Originally Posted by Pdwhitt View Post
I am building a small boombox, using a stereo amp, with (2) 3" tweeters, but I only have room for one woofer. I want to maintain the stereo output of the two tweeters. My amp only has two stereo outs, no mono out. How do I wire the single woofer?
Did you solve the problem? I am interested in a solution too.

I found this, which might be helpful
Why Not Wye?
  Reply With Quote
Old 23rd July 2013, 02:10 PM   #6
oshifis is offline oshifis  Hungary
diyAudio Member
 
Join Date: Mar 2004
Location: Budapest, Hungary
I think a two-input crossover (two separate L, one C parallel to the woofer) might work.
  Reply With Quote
Old 23rd July 2013, 06:51 PM   #7
diyAudio Member
 
Join Date: May 2012
Location: London
There is a very easy and satisfactory way to do this. Buy a Monacor sph 135 tc. The tc stands for "twin coil". It has 2 coils driving the same cone. They are electrically separate. So you just connect one channel to one coil and one channel to the other.

It is very similar to the 135 ad, with a higher Q and a lower Vas, with a very slightly flatter frequency response. If you only want it for mono, the 2 coils can be joined in series for 16 ohm or parallel for 4 ohm.
  Reply With Quote
Old 23rd July 2013, 07:36 PM   #8
kbzx35 is offline kbzx35  United States
diyAudio Member
 
Join Date: Mar 2013
Dual Voice Coil would be your sure and simplest bet. I built a small boombox off of an Audience A3 DVC 3" and a chipamp with success.
  Reply With Quote
Old 23rd July 2013, 09:47 PM   #9
diyAudio Member
 
Join Date: Jun 2007
There are also transformers, typically found in IN-Ceiling speakers that take Stereo inputs and blend them down to a single mono output. Find a place that specializes in In-Ceiling and In-Wall speakers and they should have these stand alone transformers.

Typically this would be used in a in-ceiling in a bathroom where there is limited room available. One speaker carries both channels. In some case I have seen In-Ceiling with two stereo tweeters but a single mono woofer. This increases the sense of stereo imaging.

Just to illustrate the point -

RMD: Rack products and electronic accessories for home and small business?

In reasonably affordable Dual Voice Coil woofer, consider Dayton Audio -

Dayton Audio SD215A-88 8" DVC Subwoofer 295-484

Dayton Audio SD270A-88 10" DVC Subwoofer 295-486

Keep in mind, each voice coll is 4 ohms.

Steve/bluewizard
  Reply With Quote
Old 23rd July 2013, 11:02 PM   #10
diyAudio Member
 
Join Date: Jul 2013
Thanks for the replies!
The "72 Watt Stereo-to-Mono Isolator Transformer Mixer Panel" might work but i still need a crossover to keep the high frequencies in stereo for the tweeters i guess.

I didn't know about Dual Voice Coilwoofers until now. Seems like the cheapest solution.
But they seems rare. I am looking for a light weight (Neodymium) high efficiency duel/twin voice coil woofer in 6-8" for my project.

Any ideas if such a woofer exists?
  Reply With Quote

Reply


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
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Audax Tweeters and woofer questions? cross reference Multi-Way 5 6th November 2012 12:22 PM
Just powering tweeters from a 300w stereo amp via electronic crossover crazyboy Multi-Way 10 5th March 2010 07:43 PM
Woofer adivce to match my tweeters IG81 Multi-Way 19 16th April 2009 05:37 PM
Mounting tweeters over the woofer in a line array. GuyPanico Multi-Way 8 28th June 2007 11:10 PM
Ribbon tweeters as per Stereo Unlimited truthrider Multi-Way 0 2nd March 2004 12:19 AM


New To Site? Need Help?

All times are GMT. The time now is 12:23 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2