TML Subwoofer sanity check - 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 29th September 2009, 10:46 PM   #1
LarsJ is offline LarsJ  Sweden
diyAudio Member
 
Join Date: Aug 2009
Default TML Subwoofer sanity check

Hi,

Want to get a sanity check of the project before I put to much time and effort in it. Get some opinions if this is a good idea or if itís just a dead end.

In the living room we have a TV-table (with solid sides) that has only a shelf underneath that is just collecting dust and magazines. Under this table Iím planning to hide a Sub-woofer. Available space is W=110, D=56, H=51 cm. Cover front and back with some nice fabrics, should get quite good VAF on this.

The idea is to build a sub with two 12 inch elements mounted back to back, one at the front and one at the rear, and load them symmetrically with a transmission line with ports both to front and back. What difference would it be with port guidance contra without?

See attached drawing

Will start with a Pioneer drivers used in a pair of ďpartyĒ speakers at the moment.
TS-W302C: QTS=0.331, VAS=231.38, Fs=21.5 Hz, RMS=150W, IMP=4 ohm.
Yes, I know its car speakers but the plan is to get some better suited later on, what that now would be.

Some opinions or advises before I start?

Br
LarsJ
Attached Files
File Type: doc Sub-woofer.doc (37.0 KB, 36 views)
  Reply With Quote
Old 30th September 2009, 09:06 AM   #2
Henkjan is offline Henkjan  Netherlands
diyAudio Member
 
Henkjan's Avatar
 
Join Date: Jan 2006
Location: Berkel en Rodenrijs
I have a TL sub under the TV as well
tadaaaa.jpg

on the TL: basically a good idea, the 'dual firing' might even help in a better integration in the room
a few tips: try to put the driver at 1/3 of the length; the chamfering of the corners is not needed
  Reply With Quote
Old 30th September 2009, 04:12 PM   #3
frugal-phile(tm)
diyAudio Moderator
 
planet10's Avatar
 
Join Date: Oct 2001
Location: Victoria, BC, NA, Sol III
Blog Entries: 5
Quote:
Originally Posted by LarsJ View Post

Available space is W=110, D=56, H=51 cm....VAS=231.38, Fs=21.5 Hz
Just a hunch... the available space (308 litre gross) is not sufficient to put even a single driver TL.

dave
__________________
community sites t-linespeakers.org, frugal-horn.com, frugal-phile.com ........ commercial site planet10-HiFi
p10-hifi forum here at diyA
  Reply With Quote
Old 30th September 2009, 08:32 PM   #4
Henkjan is offline Henkjan  Netherlands
diyAudio Member
 
Henkjan's Avatar
 
Join Date: Jan 2006
Location: Berkel en Rodenrijs
looking at MJK's allignment tables, 1 should certainly be OK, 2 will be a bit tight...
  Reply With Quote
Old 30th September 2009, 11:03 PM   #5
LarsJ is offline LarsJ  Sweden
diyAudio Member
 
Join Date: Aug 2009
With a simple rearrangement the driver is placed at 1/3 down the line.
First ruff estimation gives L~300 cm, SL/SO~0.35 and Fo~23 Hz
By heavy stuffing of the speaker the mismatch between driver and TML could be masked, becoming more like an open baffle. Loss of efficiency is not so critical for me. With better suited drivers the stuffing could be reduced later on.

Br
LarsJ
Attached Files
File Type: doc Sub-woofer.doc (28.0 KB, 8 views)
  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
F1 Voltage sanity check rpafenberg Pass Labs 7 28th March 2009 10:42 AM
Sanity Check ..... please Lostcause Digital Source 0 16th October 2008 06:19 PM
XO sanity check for newbie avizandum Multi-Way 2 30th December 2007 08:29 PM
Subwoofer sanity check fat_terry Subwoofers 5 4th September 2004 10:49 PM
Sanity check planet10 Multi-Way 14 7th March 2004 10:15 PM


New To Site? Need Help?

All times are GMT. The time now is 03:25 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