Greatest output for space - 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 11th May 2010, 03:05 PM   #1
diyAudio Member
 
kipman725's Avatar
 
Join Date: Jun 2007
Location: London/N.lincs
Send a message via MSN to kipman725
Default Greatest output for space

I am thinking about an omi directional sound system (mono) and have a space 0.4x0.4x1.2m to work with for the bass unit. I would like this speaker to cover 30 - 100hz, input is a typicaly going to be very bass heavy party music (dub etc). Therfore quality is secondary to absolute output. I would prefer to minimise needed power input as I have a spare 80+80W amplifier that I would like to use one channel for the sub and one for the main/trebble.

I would like to know what kind of sub designs to look into, my woodworking skill dosen't extend to curves or angled cuts so most horn designs are out. Any ideas?
  Reply With Quote
Old 11th May 2010, 08:23 PM   #2
diyAudio Member
 
chris661's Avatar
 
Join Date: Feb 2008
Location: Sheffield
Blog Entries: 8
Would you miss the last 20Hz on your specified frequency response? 50Hz can be done extremely loud, but getting down to 30Hz at the same volume means a lot more displacement is needed.
__________________
"Throwing parts at a failure is like throwing sponges at a rainstorm." - Enzo
My setup: http://www.diyaudio.com/forums/multi...tang-band.html
  Reply With Quote
Old 11th May 2010, 09:27 PM   #3
diyAudio Member
 
kipman725's Avatar
 
Join Date: Jun 2007
Location: London/N.lincs
Send a message via MSN to kipman725
yep lowest note on a bass is 41Hz so I idealy don't want any atenuation of this. If anercoic response -3dB is 30Hz then room gain should extend the response down to 20Hz. I aiming for serious trouser flapping.

having a look around at the ultra low end drivers within the student budget I have found:
http://onecall.farnell.com/pro-signa...-12/dp/3708550
I suspect this is a rebadged skytronic woofer, I would have to mesure it to find its thile small parameters but I think 4 of these in a ported enclosure would be pretty impesive.
  Reply With Quote
Old 11th May 2010, 09:28 PM   #4
GM is offline GM  United States
diyAudio Member
 
GM's Avatar
 
Join Date: Jun 2003
Location: Chamblee, Ga.
Hmm, ~192 L before subtracting out the driver(s), bracing, vent(s) doesn't leave much available space to make high SPL at even 50 Hz with only 80 W on tap.

GM
__________________
Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.
  Reply With Quote
Old 11th May 2010, 10:16 PM   #5
diyAudio Member
 
kipman725's Avatar
 
Join Date: Jun 2007
Location: London/N.lincs
Send a message via MSN to kipman725
actualy I think looking at the space again I think 1x0.4x1.2 is the actual maximum size giving 480L. Is that more promising?
  Reply With Quote
Old 11th May 2010, 11:45 PM   #6
GM is offline GM  United States
diyAudio Member
 
GM's Avatar
 
Join Date: Jun 2003
Location: Chamblee, Ga.
Quote:
Originally Posted by kipman725 View Post
actualy I think looking at the space again I think 1x0.4x1.2 is the actual maximum size giving 480L. Is that more promising?
Bigger is better, but big enough? According to Richard Small (the S in T/S), max vented box efficiency in liters for 30 Hz/F3 is: n0 = ~3.9*10^6*30^3*(480/1000) = ~5.054%, then SPL = ~112.018+(10*log10(0.05054)) = ~99.055 dB and adding in 80 W = +(10*log10(80)) = ~118.08 dB/m

Since the max size will be somewhat smaller due to box panel thickness, etc., it will of course be somewhat lower. In a large room where it will be falling with distance it will be mildly entertaining, but hardly 'trouser flapping'.

GM
__________________
Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.
  Reply With Quote
Old 12th May 2010, 06:36 AM   #7
diyAudio Member
 
chris661's Avatar
 
Join Date: Feb 2008
Location: Sheffield
Blog Entries: 8
Mildly entertaining?
I can't think of many in-house systems that will do that sort of thing.

I'd strongly advise going for something a little more rugged than a hifi replacement driver. Think PA gear. There's much more efficiency on offer, and they're designed to be played loud for some time.

What SPL are you looking for?
You'll need something of high efficiency to go half-serious (120dB) with 80W.
I would expect that a single (or two) 18" drivers would easily out perform the 12" woofers you linked to.

Chris
__________________
"Throwing parts at a failure is like throwing sponges at a rainstorm." - Enzo
My setup: http://www.diyaudio.com/forums/multi...tang-band.html
  Reply With Quote
Old 12th May 2010, 03:08 PM   #8
GM is offline GM  United States
diyAudio Member
 
GM's Avatar
 
Join Date: Jun 2003
Location: Chamblee, Ga.
What does what most folks have in the way of a sound system have to do with this thread?

For bass heavy music, it takes a very small room with lots of room gain (~ +18 dB IIRC) to get the kind of visceral 'entertainment' the OP wants at 30 Hz that ~115 dB/m can be at >100 Hz.

I agree that if only one driver is used that it needs to be a good quality ($$) prosound unit, but as efficiency rises with increasing number of drivers it becomes less critical when the amp's rated power is ~on a par with the driver's continuous rating, so it boils down to how many inexpensive drivers can be had within both the financial and size constraints.

Anyway, unless the OP has enough room gain to make up for his lack of available speaker space, then what driver(s) he uses is moot at least for now.

GM
__________________
Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.
  Reply With Quote
Old 12th May 2010, 04:09 PM   #9
diyAudio Member
 
chris661's Avatar
 
Join Date: Feb 2008
Location: Sheffield
Blog Entries: 8
Quote:
Originally Posted by GM View Post
What does what most folks have in the way of a sound system have to do with this thread?
I'm not sure. Probably a lapse in concentration.

Anyway, I think we need to know the target SPL, and financial constraints before we can go any further.

Chris
__________________
"Throwing parts at a failure is like throwing sponges at a rainstorm." - Enzo
My setup: http://www.diyaudio.com/forums/multi...tang-band.html
  Reply With Quote
Old 12th May 2010, 04:39 PM   #10
Glowbug is offline Glowbug  United States
diyAudio Member
 
Glowbug's Avatar
 
Join Date: Feb 2006
Location: Hillsborough, NC/McLean, VA
Plate amps up to several hundred watts are incredibly cheap; IMO, that would be what I'd look in to
__________________
Jim J.
  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
Using a standard pentode-tetrode as output "space-charge tube" any ideas-experiences? bembel Tubes / Valves 12 11th March 2010 05:56 AM
Greatest circuit ever (or weirdest) kenpeter Tubes / Valves 25 17th May 2009 08:56 PM
Which Krell has the greatest sound Alex helge Solid State 5 5th April 2006 12:40 AM
Which diaphragm shape has the greatest dispersion? 454Casull Multi-Way 3 20th July 2004 12:18 AM
one of the greatest orchestral recordings ever dorkus Music 15 7th February 2003 01:23 PM


New To Site? Need Help?

All times are GMT. The time now is 11:52 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