closed sub -> open baffle ? - 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 31st January 2006, 08:55 AM   #1
hilbren is offline hilbren  Netherlands
diyAudio Member
 
Join Date: Jul 2003
Location: utrecht
Default closed sub -> open baffle ?

Hello i've build a closed subwoofer for the lower frequenties that my esl's can't handle.

but, the sub is sounding a bit booming...

so i was thinking about making is it open baffle by making really big hole on the backside of the subwoofer?

size is 42 by 42 by 57 cm's
weight 36 kilo's
driver: http://www.speakertrade.com/car-hifi...kel=AXX%201212

is that audible?

Click the image to open in full size.
Attached Images
File Type: jpg sub_plot.jpg (56.1 KB, 329 views)
  Reply With Quote
Old 31st January 2006, 09:39 AM   #2
Did it Himself
diyAudio Member
 
richie00boy's Avatar
 
Join Date: Nov 2003
Location: Gloucestershire, England, UK
If you are finding it boomy I suspect that there is an issue with the room and/or the integration with your main speakers and there is no need to cut your subwoofer. Try moving the subwoofer around. How are you driving the sub and what filters and EQ etc are you using? Details of the subwoofer as well would be helpful...
__________________
www.readresearch.co.uk my website for UK diy audio people - designs, PCBs, kits and more.
  Reply With Quote
Old 31st January 2006, 09:57 AM   #3
hilbren is offline hilbren  Netherlands
diyAudio Member
 
Join Date: Jul 2003
Location: utrecht
Quote:
Originally posted by richie00boy
If you are finding it boomy I suspect that there is an issue with the room and/or the integration with your main speakers and there is no need to cut your subwoofer. Try moving the subwoofer around. How are you driving the sub and what filters and EQ etc are you using? Details of the subwoofer as well would be helpful...
Well i gave the dimensions and i gave a link to the specs of the driver...
I moved the subwoofer around for some time now, but nothing helps.
  Reply With Quote
Old 31st January 2006, 12:02 PM   #4
Did it Himself
diyAudio Member
 
richie00boy's Avatar
 
Join Date: Nov 2003
Location: Gloucestershire, England, UK
OK I see the link now, but what about your filters etc?
__________________
www.readresearch.co.uk my website for UK diy audio people - designs, PCBs, kits and more.
  Reply With Quote
Old 31st January 2006, 01:18 PM   #5
hilbren is offline hilbren  Netherlands
diyAudio Member
 
Join Date: Jul 2003
Location: utrecht
actually i don't have any filter, the only filter that is present is the one in my receiver.
  Reply With Quote
Old 31st January 2006, 01:42 PM   #6
Did it Himself
diyAudio Member
 
richie00boy's Avatar
 
Join Date: Nov 2003
Location: Gloucestershire, England, UK
Which I would be willing to bet money on is the cause of your problems. You need a proper filter matched to your main speakers.
__________________
www.readresearch.co.uk my website for UK diy audio people - designs, PCBs, kits and more.
  Reply With Quote
Old 1st February 2006, 04:29 AM   #7
simon5 is offline simon5  Canada
diyAudio Member
 
Join Date: Nov 2004
Location: Québec, Québec
I think richie00boy is right, it seems you doesn't have a lowpass filter because your subwoofer is strong over 80 Hz. It's also overboosted in that range. Try lowering the gain of the subwoofer maybe.

I doubt going dipole would help much, but you could try...
__________________
DIYaudio for President !
  Reply With Quote
Old 1st February 2006, 07:20 AM   #8
Did it Himself
diyAudio Member
 
richie00boy's Avatar
 
Join Date: Nov 2003
Location: Gloucestershire, England, UK
I think the receiver has a low-pass filter, but it will be the typical 80Hz 2nd-order, which is probably not the best match for his main speakers. IMO going dipole is not addressing the real problem, if it even solves it at all.
__________________
www.readresearch.co.uk my website for UK diy audio people - designs, PCBs, kits and more.
  Reply With Quote
Old 7th February 2006, 04:07 PM   #9
hilbren is offline hilbren  Netherlands
diyAudio Member
 
Join Date: Jul 2003
Location: utrecht
I found it hard to believe it would be because there is not a filter present.

So I tested some more and found out it was my own (dc coupled) amplifier.
For now I am using a regular stereo amplifier.

but what i was wondering, is there somebody ho has listed all available sub amplifiers?
I am looking for something with a compact class D amplifier (no frequentie deformation fuctions)
  Reply With Quote
Old 7th February 2006, 05:25 PM   #10
Did it Himself
diyAudio Member
 
richie00boy's Avatar
 
Join Date: Nov 2003
Location: Gloucestershire, England, UK
The UcD modules are easy to assemble into a power amp, and Hypex are based in your country.

I can also say that I have had great results with ZAPpulse modules from LC Audio.
__________________
www.readresearch.co.uk my website for UK diy audio people - designs, PCBs, kits and more.
  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
use closed headphone open with current source amp? el`Ol Headphone Systems 1 21st November 2006 02:16 AM
Sub for convertible - top open/closed rjon17469 Subwoofers 5 19th April 2005 11:01 PM
Australians- what solid timbers for baffle? (open baffle loudspeaker) tktran Multi-Way 13 29th November 2004 11:09 PM
over-excursion damage (closed or open box) jonz Multi-Way 7 1st June 2004 01:19 AM
Opamp phase shift - open and closed loop. Circlotron Analogue Source 8 23rd April 2003 07:06 AM


New To Site? Need Help?

All times are GMT. The time now is 06:38 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