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

mechanical coupling of subwoofers
mechanical coupling of 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
Thread Tools Search this Thread
Old 14th November 2011, 11:04 AM   #1
muddasirwaheedmalik is offline muddasirwaheedmalik  Pakistan
diyAudio Member
Join Date: Jul 2010
Default mechanical coupling of subwoofers

ok. its a hypothetical situation but we can search for science behind it for application on some medium level subs having low X linear and distortion due to motor non linearities.

I have a stock iof some medium quality 8 inch subwoofers Fs 38 Hz Vas 17 litres, have around 10 mm Xmax and with 1 inch big roll surrouonds. in 1 litre box they have Fb of 49 Hz and sound ok in car.

Now i was wondering that if one would remove the surround and cone of one subwoofer , invoert it fix it on other with chasis screws and physically connect them with a tube.

What we have done...wasted on woofer yes
2. double the motor strength
3. Compliance reduced not half as surround is removed
4. totally symmetrial BL curve
5. Increased Mms more than one driver but how much depending upon the coupling plastic tube.
6. Decreased Fs,,,,, may be.
7 Reduced distortion...sure

Now i know its more like isobaric but its not.... its truly isobaric and nonlinearlities in in coupling between them is completely removed. reduced Mms if coupling tube weighs less than removed cone and reduced compliance, that means smaller Vas????


any comments?
  Reply With Quote
Old 14th November 2011, 11:24 AM   #2
ODougbo is offline ODougbo  United States
diyAudio Member
Join Date: Aug 2011
Location: Maryland USA
That might be tough to connect them, might go thru a few woofers before you get one to hold.

I'd build a tunnel of some sort; you might get better results with a slight hour glass shape.

Question for the forum also, would the speaker(s) magnet polarity need to line up?

[I'm getting ready to assemble one ~ I'm going to try to match up the magnetic fields]
  Reply With Quote
Old 14th November 2011, 01:45 PM   #3
muddasirwaheedmalik is offline muddasirwaheedmalik  Pakistan
diyAudio Member
Join Date: Jul 2010
well with 3-4 inch nuts and bots 8 of them could hold them firmly together .. and with face plates 6-8 inch apart i donot think it would affect magnetic field .

I am interested in that by removing one cone+surround , i am driving one cone with 2 motors in pull push mechanism, echanically coupled it should give excellent linearlity. questions for the forum then.

1. Fs
2. Qt.
3. Bl
4. Qm/Qe (assuming wired in parallel)
5. Vas
6. Distorton

  Reply With Quote


mechanical coupling of subwoofersHide 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
Mechanical problem on designing wilkins7 Construction Tips 1 20th October 2011 12:30 AM
mechanical hum Bill*B Tubes / Valves 4 30th May 2007 09:42 PM
Mechanical ear purplepeople Everything Else 1 5th February 2005 02:40 PM
New forum/-Mechanical Magura Everything Else 0 29th March 2004 01:21 AM
Shelf building: mechanical coupling tiroth Everything Else 3 27th August 2003 01:20 PM

New To Site? Need Help?

All times are GMT. The time now is 12:54 AM.

Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.79%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio