Which enclosure for best bass performance? - diyAudio
Go Back   Home > Forums > Loudspeakers > Multi-Way

Multi-Way Conventional loudspeakers with crossovers

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 21st March 2013, 02:44 AM   #1
SpirosZ is offline SpirosZ  Greece
diyAudio Member
 
Join Date: Jan 2013
Default Which enclosure for best bass performance?

I am still in the process of finding the right design for my HT using high efficiency pro drivers.
So far some of my favorites are the SEOS waveguide designs.

I am thinking about building one using the Eminence Delta 12lfa woofer but I want to get the best possible bass performance out of that driver.
Size in not a problem as long as it is not more than 45cm wide and 45cm deep (more or less).
I don't have a problem with height but I would like a design that brings the drivers at ear level when sitting.
Pi speakers uses that driver in a BR enclosure aound 105-110lt in the Three Pi speaker, Eminence recommends a BR enclosure between 25.5-102lt or a sealed at 19.8-28lt and WinISD recommends 218lt BR tuned @ 32Hz.
WinISD also gives me nice looking curves with boxes between 110-180lt tuned between 32-35Hz.
I did a few calculations for a TQWT enclosure and came up with boxes between 133-185lt
Most of them came out too deep but the smaller one looks fine with internal dimensions 86.8X38.3X41.6 (cm H/W/D) for an internal volume of 133.3lt and an f3 of 38.4Hz

If I model a box of 133.3 lt in WinISD tuned around 32Hz (using the same size port as the one in the TQWT enclosure) it looks nice with a sight downslping curve and an f3 at 34Hz and f6 at 27Hz (better than the f3 38.4 of the TQWT). .
The TQWT box is actualy just a BR box with a bracing that makes it act as a quarter wave tapped tube. What am I supposed to expect from it?
Will the TQWT design have any benefits compare to the simple BR box?
I cannot sim the response of the TQWT with WinISD and Hornresp is too complicated for me to even try a different design (it may be able to simulate the TQWT but I have no idea how).

Am I on the right track? Is there a better option that I haven't think of?

Last edited by SpirosZ; 21st March 2013 at 02:48 AM.
  Reply With Quote
Old 21st March 2013, 07:57 PM   #2
SpirosZ is offline SpirosZ  Greece
diyAudio Member
 
Join Date: Jan 2013
Is it possible to angle the front baffle (for toe-in) and not lose the TQWT loading?
  Reply With Quote
Old 21st March 2013, 08:04 PM   #3
diyAudio Member
 
Join Date: Nov 2010
Fully sealed enclosures always sound better.
  Reply With Quote
Old 21st March 2013, 09:50 PM   #4
diyAudio Member
 
Join Date: Aug 2003
Location: Cheltenham
Quote:
Originally Posted by toprepairman View Post
Fully sealed enclosures always sound better.
All things being equal, I agree.
  Reply With Quote
Old 21st March 2013, 10:08 PM   #5
SpirosZ is offline SpirosZ  Greece
diyAudio Member
 
Join Date: Jan 2013
Tighter most of the times for sure but extension suffers greatly and I plan to use it without a sub.
  Reply With Quote
Old 21st March 2013, 10:49 PM   #6
diyAudio Member
 
danny_66's Avatar
 
Join Date: Jun 2005
Location: Lierde
Quote:
Originally Posted by toprepairman View Post
Fully sealed enclosures always sound better.
Not for my speakers, I first tried a closed cabinet, but didn't have enough low bass.
So I made a bass reflex with a downfiring port and I got all the bass that I wanted
I much prefer a bass reflex that goes down to 30hz than closed that rolls off much sooner (If the same drivers are used)
__________________
My RefSpeaker
  Reply With Quote
Old 22nd March 2013, 04:07 AM   #7
diyAudio Member
 
Join Date: Feb 2012
Location: Los Angeles
Don't forget about transmission line enclosures.
  Reply With Quote
Old 22nd March 2013, 05:41 AM   #8
diyAudio Member
 
Richard Ellis's Avatar
 
Join Date: Sep 2006
Location: Mar del Plata, a BIG seasonal getaway city, can see the Ocean from our residence.
Quote:
Originally Posted by toprepairman View Post
Fully sealed enclosures always sound better.
Not really, the Eminence 12 Delta LFA has an efficiency bandwidth product of exactly 100 ....Putting it smack middle into the porting camp.
Running this driver in a sealed enclosure would be like having a race-horse pulling a buckboard.


__________________________________________________ ___Rick........
  Reply With Quote
Old 22nd March 2013, 09:38 AM   #9
Jay is offline Jay  Indonesia
diyAudio Member
 
Join Date: Feb 2003
Location: Jakarta
Low Qts woofer in horn enclosure.
High Qts woofer in sealed enclosure.

Low Qts woofers tend to have weak bass, but when done properly/successfully, the quality of the bass is usually better than high Qts woofers.

Horn is the best for apparent reason (talking about single bass driver here): When you try to get the lowest octave (the bass) from a woofer, you loose the high octave (midrange) quality. Horn can restore the midrange quality while reaching the lowest octave (can be through big horn which is best, or through transmission line)
  Reply With Quote
Old 22nd March 2013, 10:05 AM   #10
SpirosZ is offline SpirosZ  Greece
diyAudio Member
 
Join Date: Jan 2013
Quote:
Originally Posted by Jay View Post
When you try to get the lowest octave (the bass) from a woofer, you loose the high octave (midrange) quality.
How is that happening?
  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
SE poweramp with best bass performance Hylle Tubes / Valves 14 27th October 2012 05:03 PM
fabricated steel enclosure bad for driver performance? mrkahn Multi-Way 10 11th April 2008 04:52 PM
enclosure tuning performance crippledchicken Subwoofers 0 8th August 2006 05:35 AM
Amp1-B Terrible Bass Performance dsavitsk Class D 16 18th September 2005 10:05 PM
Bass Drivers - performance/$ ShapeS Multi-Way 20 8th March 2004 04:17 PM


New To Site? Need Help?

All times are GMT. The time now is 12:11 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