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

Really basic TL question
Really basic TL question
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 10th October 2007, 06:15 PM   #1
weinstro is offline weinstro  United States
diyAudio Member
weinstro's Avatar
Join Date: May 2003
Location: N. Cal
Default Really basic TL question

Hi all,

Suppose I have a sealed enclosure, with an appropriate driver mounted. I used one of the many box size calculators to arrive at the enclosure size, aiming for a Qtc of 0.7.

Now suppose that one dimension of the box happens to equal the quarter wave length of the driver's Fs. Volume is unchanged from above, but the box is a tall column.

What happens? How would the performance of the driver differ from that predicted by say, Unibox? Does it matter where the driver is mounted?
  Reply With Quote
Old 10th October 2007, 07:33 PM   #2
Scottmoose is offline Scottmoose  United Kingdom
diyAudio Member
Scottmoose's Avatar
Join Date: Mar 2005
Location: UK
Yes, it will make a difference where the driver is mounted. In effect, assuming it's stuffed properly, what you have there is a 'real' transmission line, rather than the more usual aperiodic lines, or mass-loaded lines. Will the differences be significant? Depends on the driver & cabinet. What exactly are they?
"'That'll do", comes the cry of the perfectionist down the ages.' James May -The Reassembler
www.wodendesign.com Community sites www.frugal-horn.com http://frugal-phile.com/
  Reply With Quote
Old 11th October 2007, 04:08 AM   #3
GM is offline GM  United States
diyAudio Member
GM's Avatar
Join Date: Jun 2003
Location: Chamblee, Ga.

Assuming the box is still sealed, then there will be 'room' modes beginning at 1/2 WL with a deep notch at every harmonic, so its response will be tuned lower and anything but smooth. Driver placement makes a big difference with the midpoint yielding the smoothest, though still relatively ragged response which stuffing will smooth out to a great extent at the expense of a much higher F3.

Bottom line, not a good plan IMO.

Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.
  Reply With Quote
Old 11th October 2007, 05:16 AM   #4
Shae is offline Shae  Australia
diyAudio Member
Join Date: Oct 2007
woops wrong thread
  Reply With Quote


Really basic TL questionHide 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
amp question basic rec rebith75 Solid State 3 16th March 2007 05:43 PM
Basic RC Value Question SRMcGee Tubes / Valves 6 13th August 2006 05:39 PM
really basic question cuallito Tubes / Valves 6 15th April 2004 08:25 PM
Basic question Tommy Solid State 6 22nd February 2004 03:08 PM
really basic question MbayAQ Digital Source 3 7th January 2003 12:57 PM

New To Site? Need Help?

All times are GMT. The time now is 03:29 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