Subs too big for bedroom - diyAudio
Go Back   Home > Forums > Loudspeakers > Subwoofers
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

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 24th September 2005, 01:11 PM   #1
bigwill is offline bigwill  United Kingdom
diyAudio Member
Join Date: Dec 2004
Location: UK
Default Subs too big for bedroom

I've recently built some big TL subwoofers (see this thread) and I just put them in my bedroom

They can get down to about 25Hz with the cones barely moving! But the problem is, you can only hear/feel it if you're right at the opposite end of the room as the subs! This applies to everything below about 40Hz. The lower I go, the further away from the subwoofers I have to get to actually hear the note. My room is terrible! 25Hz is interesting because when you stand right next to the speakers, you can't hear or feel anything, but you can hear stuff in other rooms vibrating

I might try them in the middle of the room, but that will require me to move a lot of my junk out of the way.

Any help would be appreciated


  Reply With Quote
Old 24th September 2005, 02:31 PM   #2
diyAudio Moderator
pinkmouse's Avatar
Join Date: Apr 2002
Location: Rotherham, England
Default Re: Subs too big for bedroom

Originally posted by bigwill
...but that will require me to move a lot of my junk out of the way.

Any help would be appreciated...
Sorry mate, I don't do lifting!
Rick: Oh Cliff / Sometimes it must be difficult not to feel as if / You really are a cliff / when fascists keep trying to push you over it! / Are they the lemmings / Or are you, Cliff? / Or are you Cliff?
  Reply With Quote
Old 24th September 2005, 02:37 PM   #3
DorinD is offline DorinD  Romania
diyAudio Member
DorinD's Avatar
Join Date: Jan 2005
Location: Bucharest
Hi Bigwill,
I would make a guess that your description has something to do with different phase of the waves coming from drivers and ports. Could be anything else but this is simple to check; just close the ports and see what's happening.
I'm just thinking to make a TL sub and such situation (big sub in small room) is also my case, so I want to make a try with a closed-ended half-wavelenght TL.
  Reply With Quote
Old 24th September 2005, 02:49 PM   #4
diyAudio Member
Join Date: Apr 2005
Location: Belfort
Send a message via MSN to youyoung21147
They are probably out of phase : it's quite hard to run 2 subs in a small room.

Try switching off one of them, or reverse the speaker's connexion on one of them. Maybe it can solve the problem.
  Reply With Quote
Old 24th September 2005, 02:49 PM   #5
johnnyx is offline johnnyx  United Kingdom
diyAudio Member
Join Date: Jan 2004
Location: manchester
FWIW I have experienced this with closed box speakers, so it's nothing to do with ports. The output @ 25Hz measured the same level as that @ 40Hz, yet I couldn't hear bass below 30Hz. Just the way it is with small rooms, I suppose.
  Reply With Quote
Old 24th September 2005, 02:56 PM   #6
bigwill is offline bigwill  United Kingdom
diyAudio Member
Join Date: Dec 2004
Location: UK
Thanks for the suggestions people I'll try reversing the phase of one of them. This might be the problem, since when you turn on my amp you usually get a thump you can feel even with small speakers, but with these you couldn't

It might just be the room though!

I'll give it a go

Edit: Ok, I just tried it. Music sounds better but suddenly there is NOTHING below 35Hz ANYWHERE! I guess they were in phase in the first place. This is crazy!
  Reply With Quote
Old 24th September 2005, 03:30 PM   #7
zobsky is offline zobsky  India
diyAudio Member
zobsky's Avatar
Join Date: Mar 2002
Location: Dallas, Tx, USA
try playing with placement (perhaps with only one turned on for a start)
1. move them away / closer to the rear wall
2. try flipping it to/ bottom so the terminus is at the bottom instead of the top
3. try placement along a wall rather than at a corner
4. try firing the driver at the wall
5. try playing with the amount of stuffing
6. bunch the subs together, .. see if you can get the wavefronts to reinforce each other

other combinations of 1,2,3,4,5,6

something else which i do, and am not sure how useful it is in the context of your issue is to run the subwoofers nearfield as opposed to farfield (however, in your case, the nearfield response is your issue so .. )

it might be useful to run a frequency response test if that's possible.

i had the similar room modes issue in my living room leading to the eventual banishment of any hi fidelity devices from that space
"Not everything that can be counted counts, and not everything that counts can be counted." - Albert Einstein
  Reply With Quote
Old 24th September 2005, 03:39 PM   #8
Did it Himself
diyAudio Member
richie00boy's Avatar
Join Date: Nov 2003
Location: Gloucestershire, England, UK
I reckon there's nothing wrong with your speakers and it's simply that you have a lot of nulls in your room. Fiddle with the positioning, but in a small room I don't think you'll make huge differences.
__________________ my website for UK diy audio people - designs, PCBs, modules and more.
  Reply With Quote
Old 24th September 2005, 03:59 PM   #9
diyAudio Member
tomtt's Avatar
Join Date: Aug 2002
Location: kansas city mo, and on occasion, around the world ...
Blog Entries: 15
perhaps the subs coud be placed in another room
  Reply With Quote
Old 24th September 2005, 05:16 PM   #10
bigwill is offline bigwill  United Kingdom
diyAudio Member
Join Date: Dec 2004
Location: UK
I think the problem is the fact that my bedroom is basically a big concrete square!

Luckily, most of the bass seems to be concentated in the corner where my computer is, and it's nice to listen to music while on there, so it's not all bad

Another thing that could make the responce a bit more peaky is the fact that my TLs are unstuffed. I will experiment with this soon!
  Reply With Quote


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
Bedroom speakers oaristys Multi-Way 15 13th June 2009 01:58 PM
Bedroom DJ speakers echosystm Multi-Way 3 22nd February 2007 01:49 AM
Car audio in my bedroom. KoRnRULZ6 Car Audio 3 25th September 2004 09:23 PM
Speakers for bedroom 5th element Multi-Way 3 9th April 2004 09:50 AM
Looking for opinons about 5 x Alelph-5 for bedroom HT. eclam Pass Labs 3 11th April 2003 07:44 AM

New To Site? Need Help?

All times are GMT. The time now is 07:58 PM.

vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright 1999-2017 diyAudio

Content Relevant URLs by vBSEO 3.3.2