help/tips to reduce footprint/volume of ML-TL? - diyAudio
Go Back   Home > Forums > Loudspeakers > Full Range

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 13th June 2013, 01:15 PM   #1
diyAudio Member
 
Join Date: Jan 2012
Default help/tips to reduce footprint/volume of ML-TL?

just trying to create a ML-TL for a new 15" coax driver.

L - 155cm
Zdriver - 40cm
Zport - 142.5cm
So - 3500cm2
Sl - 3500cm2
port - 50x12.5cm
port length - 5cm

gives me this

Click the image to open in full size.

which is ok on face value.

the problem is the footprint and volume are pretty big, over 500 litres, which pushes it into tannoy GRF territory. If i have 500 litres to play with, can i do 'better' than this, i.e extension and uniformity?

is there anyway to keep that kind of level of performance but shrink the overall footprint and/or volume back down to say sub 300 litres?

driver T/S is.

Fs - 47.7
Re - 5.2
Le - 1.4mh
BL - 19.2
Sd - 990cm2
Vas - 148.7ltr
Qed - 0.36
Qmd - 6.15
Qtd - 0.34

mounting depth is 22cm, frame size is 40cm.

any suggestions and input are most welcome.
  Reply With Quote
Old 13th June 2013, 01:30 PM   #2
IG81 is offline IG81  Canada
diyAudio Member
 
IG81's Avatar
 
Join Date: Feb 2008
That slight depression around 60Hz and very slight peak at 35Hz looks like the enclosure might be somewhat on the large side. Keeping the 155cm height, a good idea IMO to keep driver ~1/3 down the line and around ear height, you then want a 2000 square cm CSA to get ~300L. Just play with the vent dimensions and location to see if it results in anything you like. f3 will very likely be a bit higher though.

What coaxial driver is this?

Good luck,

IG
  Reply With Quote
Old 13th June 2013, 01:44 PM   #3
diyAudio Member
 
Join Date: Jan 2012
Quote:
Originally Posted by IG81 View Post

What coaxial driver is this?

Good luck,

IG
OEM part, no real info on the interweb about it. Resembles a Radian coax but the T/S are slightly different, which could just be down to my measurements.
  Reply With Quote
Old 13th June 2013, 02:08 PM   #4
diyAudio Member
 
Join Date: Jan 2012
this is around 300ltrs but loses that extra bit of LF. this any better?

L - 180cm
Zdriver - 90cm
Zport - 167.5cm
So - 500cm2
Sl - 3000cm2
port - 50x12.5cm
port length - 15cm

Click the image to open in full size.
  Reply With Quote
Old 13th June 2013, 02:26 PM   #5
IG81 is offline IG81  Canada
diyAudio Member
 
IG81's Avatar
 
Join Date: Feb 2008
So you've turned it in to a ML-TQWT now, response looks good. Anything that can do a solid 40Hz and f10 in the low 30ies should have a nice and full sound. Does excursion look reasonable at the kind of SPL you expect? In any case, it's probably better than in 500L.

How large of a room will these be used in if you don't mind me asking?

IG

Last edited by IG81; 13th June 2013 at 02:31 PM.
  Reply With Quote
Old 13th June 2013, 02:27 PM   #6
GM is offline GM  United States
diyAudio Member
 
GM's Avatar
 
Join Date: Jun 2003
Location: Chamblee, Ga.
FWIW, the way I figure such alignments, ~439 L net is the minimum for a maximally flat alignment, so you can’t shrink it much without rolling off the bass, which considering its size usually necessitates a near/at wall or corner placement, ergo it seems a reasonable trade-off if room space is at a premium.

Try ~193 L/35 Hz Fb, 142.25 cm i.d. long, driver down 49.5 cm.

GM
__________________
Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.

Last edited by GM; 13th June 2013 at 02:29 PM.
  Reply With Quote
Old 13th June 2013, 02:44 PM   #7
diyAudio Member
 
Join Date: Jan 2012
Quote:
Originally Posted by IG81 View Post
So you've turned it in to a ML-TQWT now, response looks good. Anything that can do a solid 40Hz and f10 in the low 30ies should have a nice and full sound. Does excursion look reasonable at the kind of SPL you expect? In any case, it's probably better than in 500L.

How large of a room will these be used in if you don't mind me asking?

IG
Room isnt massive in terms of floor area, it is however 2 stories high which really sucks the life out of small drivers. I heard some tannoy Westminster's in a fairly small room and loved them, then heard some altec 604s and decided a big coax is the full range drivers I've spent so much money and time looking for
  Reply With Quote
Old 29th June 2013, 03:17 PM   #8
diyAudio Member
 
Join Date: Jan 2012
this is 280 ltrs with a manageable footprint of 42x44cm (work in progress)

what happens when the rear of the driver starts to 'block' part of the line as it does here? is it going to make an audible difference to things?

Click the image to open in full size.
  Reply With Quote
Old 30th June 2013, 10:22 AM   #9
diyAudio Member
 
picowallspeaker's Avatar
 
Join Date: Apr 2007
That's a DCR
Right, IG 81 ?

TB W4-1320SIF double bass-reflex
  Reply With Quote
Old 30th June 2013, 12:11 PM   #10
IG81 is offline IG81  Canada
diyAudio Member
 
IG81's Avatar
 
Join Date: Feb 2008
Quote:
Originally Posted by picowallspeaker View Post
That's a DCR
Right, IG 81 ?

TB W4-1320SIF double bass-reflex
Yes, it is.

IG
  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
Can anyone help TL or ML-TL for Alpair 10 _henry_ Full Range 3 31st December 2008 06:31 AM
What's the difference between a TL, a ML-TL and a TQWT? Bricolo Multi-Way 82 28th August 2008 02:17 PM
ML-TL or ML-TQWT with very low Qt driver Henkjan Full Range 6 29th September 2006 02:29 PM
Small box for FE103 - ML TL or ML TQWT? ChuckT Full Range 15 28th July 2004 05:56 AM
Mbow1 / Ml Tl boone Multi-Way 7 14th January 2004 10:49 PM


New To Site? Need Help?

All times are GMT. The time now is 07:46 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