Multilple Peerless XLS 10" Sub - diyAudio
Go Back   Home > Forums > Loudspeakers > Subwoofers

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 20th September 2012, 02:48 PM   #1
diyAudio Member
 
Join Date: Sep 2012
Default Multilple Peerless XLS 10" Sub

I will be coming into at least 4 Peerless XLS 10" subs. Are there any plans available to use 2 of these in a single box for "better" performance? Or in some other way to use more to get more?

Also, I'm a bit intimidated by the idea of equalization. Is there any way I could use the frequency controls on the sub out from my processor to do the job?
  Reply With Quote
Old 20th September 2012, 04:07 PM   #2
diyAudio Member
 
5th element's Avatar
 
Join Date: Oct 2002
Location: England
Multiple drivers in the same box can be arranged to provide decent benefits. The first is to mount one driver on the front and one on the back, this means as one pushes forwards, the other pushes backwards, as the motions are equal but opposite you get force cancellation occurring.

The second is to mount the driver on the rear backwards, that is the magnet faces outside of the box. When doing this you have to wire the rear driver out of phase with the front driver, so that when the driver on the front pushes forwards, the driver on the pack pulls its cone backwards. This is called a push-pull configuration because one driver pushes as the other one pulls and visa versa. What this means is that for every positive wave motion you get the forward motion of one driver and the rearward motion of the other adding together. Then for every negative wave motion the same thing occurs, you get one forward going motion of one cone and the rearward going from the other. This causes even order distortion to cancel out lowering the overall distortion.

So in other words, with two drivers per box, you can mount them on opposite sides for force cancellation and push-pull for even order distortion cancellation. I can't really see any benefit to having more then two per box and would strongly advocate building two subs for stereo subs, rather then having one huge box with 4 drivers in.

EQ isn't particularly scary although implementing it can be a pain if none of the system is modifiable to add in a simple active stage. Most sub plate amps do have a bass boost option so this might be all you really need. If your processor can do this depends entirely on what setup options it has.
__________________
What the hell are you screamin' for? Every five minutes there's a bomb or somethin'! I'm leavin! bzzzz!
  Reply With Quote
Old 20th September 2012, 04:22 PM   #3
diyAudio Member
 
picowallspeaker's Avatar
 
Join Date: Apr 2007
Also two woofers on the opposite sides of the box , but wired in phase .
They need 24 l .
( from a mag )
  Reply With Quote
Old 20th September 2012, 04:39 PM   #4
diyAudio Member
 
Join Date: Sep 2012
Thanks for your responses. Does either of these do anything for deep base response and/or SPL? How does one decide how big a box to use for whatever results?
  Reply With Quote
Old 20th September 2012, 05:20 PM   #5
diyAudio Member
 
Join Date: Sep 2012
Quote:
Originally Posted by 5th element View Post
So in other words, with two drivers per box, you can mount them on opposite sides for force cancellation and push-pull for even order distortion cancellation. I can't really see any benefit to having more then two per box and would strongly advocate building two subs for stereo subs, rather then having one huge box with 4 drivers in.
adding on to this, dual subs help to even out room response such that listener location is not critical. After all one usually does not want to sit their a$$ in one place and listen. Also rooms can tend to have orders of magnitude more of distortion than what the enclosure could be putting out.

Quote:
Does either of these do anything for deep base response and/or SPL? How does one decide how big a box to use for whatever results
Usually larger drivers tend to go deeper, with slower transient response times - tight and quick bass. You might want to explore for a larger driver sub. I think there are designs, when designed right, can go deep using not so large drivers.

I am currently exploring a sub myself and have been looking at a dual opposed driver in phase config.

Some links that helped me.
Audioholics Home Theater Forums - View Single Post - Subwoofer...Why DIY?
HOW TO.......CHOOSE AND DESIGN THE RIGHT SUBWOOFER BOX. - uk-mkivs
Audio Innovation - by Dan Marx www.danmarx.org

Last edited by ShaQBlogs; 20th September 2012 at 05:24 PM.
  Reply With Quote
Old 20th September 2012, 05:32 PM   #6
diyAudio Member
 
picowallspeaker's Avatar
 
Join Date: Apr 2007
24 l for two speakers is the best compromise for damping etc.
Also if wired in parallel , with double cones you'll get +6 dB SPL.
It's a cube a little bigger than the speakers ( with a big brace in the middle)
  Reply With Quote
Old 20th September 2012, 09:47 PM   #7
tvrgeek is offline tvrgeek  United States
diyAudio Member
 
Join Date: Dec 2009
Location: Md
Two drivers in one box are a total waste of the potential advantages of two boxes. ( or 4) You can move the smaller boxes around to even out the rooms issues. The boxes can be smaller so they can still be sturdy but lift-able and are easier to fit into a room.

Pico,
Damping is a matter of the box design, not how many drivers.

If you have 4 drivers, and you want smaller boxes but not more bass, you could do isobaric. I have often wondered, if iso, and the drivers are cone to cone, do you get the advantage of second order distortion cancellation like side by side PP? That may have to be my next test.
  Reply With Quote
Old 21st September 2012, 08:18 AM   #8
diyAudio Member
 
picowallspeaker's Avatar
 
Join Date: Apr 2007
I only reported what I read on a mag , and the author is a nice one .
I forgot to say that those 2*XLS 10 in push-push in tha box were the final
project of a study on how to DIY a Sunfire style sub . Needless to say the
amplifier should be very muscular , like a 300 W class D from Hypex , and that
should drive very low Z loads .
  Reply With Quote
Old 21st September 2012, 11:04 AM   #9
diyAudio Member
 
Join Date: Sep 2012
Default I was contemplating two subs

with two speakers each.
  Reply With Quote
Old 21st September 2012, 12:29 PM   #10
DrDyna is offline DrDyna  United States
diyAudio Member
 
DrDyna's Avatar
 
Join Date: May 2007
Blog Entries: 3
Quote:
Originally Posted by Brucest View Post
with two speakers each.
A cabinet I have here that works well is a tall-ish box that's designed to sit in the corner with one front facing driver and one side facing one. There's two of these cabinets, 4 drivers total (when they have drivers).
Attached Images
File Type: jpg bsub.jpg (71.8 KB, 141 views)
__________________
"We may have to blast.." -Doc Brown
  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
Peerless XLS 830502 10" noslepums Subwoofers 6 30th June 2012 10:27 PM
WTB: Peerless XLS 10" (Pair) architect7 Swap Meet 1 11th December 2011 12:39 AM
WTB: Peerless XLS 10" PR oldloder Swap Meet 1 27th September 2011 05:29 AM
Peerless 10" woofers 830452 XLS lei Swap Meet 1 11th March 2010 08:10 AM
Boxsize for Peerless XLS 10" orfeous Subwoofers 2 19th January 2008 07:20 PM


New To Site? Need Help?

All times are GMT. The time now is 03:08 AM.


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