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

Multi-Way Conventional loudspeakers with crossovers

PRO-9TL leftovers
PRO-9TL leftovers
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 29th February 2012, 06:23 PM   #1
c1d2f3 is offline c1d2f3  United Kingdom
diyAudio Member
Join Date: Feb 2012
Default PRO-9TL leftovers

I've got the following bits from some Chris Rogers PRO-9TLs;

Audax hd12x9d25
Morel EM1308
Kef B139
Falcon acoustics crossovers

I pulled all this stuff out of a set of rotten PRO-9TLs that sounded great originally but were big! The Kef and Audax both work fine but the metal surrounds need a re-spray and the sticky tweeters are pretty dirty! The Morel units are brand new replacements for the original Peerless M122; I've still got a spare Peerless driver in very good condition but I couldn't find a second unfortunately.

So... two questions;

1. Does anyone know any decent 'SLIM' floor standing TL designs for the B139 drivers (I'd like to mount them on the side of the enclosure if possible)?
2. Should I re-use the dirty Audax tweeters or cough up for a new set of tweeters?

I've looked at loads of b139 enclosures online (including the very very large coffin design lol) but I've not found many aesthetically pleasing ones! :-)

I've had these bits for a couple of years now and I need to do something productive!

Thanks for any advice!
  Reply With Quote
Old 29th February 2012, 06:49 PM   #2
planet10 is online now planet10  Canada
diyAudio Moderator
planet10's Avatar
Join Date: Oct 2001
Location: Victoria, BC, NA, Sol III
PRO-9TL leftovers
You could slice one of the bipoleB139 TLs in half and end up with a very slim TL for a single B139

Transmission Line Speakers

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 1st March 2012, 11:26 AM   #3
c1d2f3 is offline c1d2f3  United Kingdom
diyAudio Member
Join Date: Feb 2012
They're still a bit on the large size!

I'd love to do a side firing design like Jamo s608s or Canton Karats - they're a nice size too!

Click the image to open in full size.

I've used the size calculators on this site (B139 SP1044 - EBP 64, Vas 164lts, Fs 25, Qts 0.37, Qtc 0.707, D 8.37in, Fb 25Hz) and the ported volume came out as 123.29 lts with f3 28.34Hz and fb 25Hz with a 3inch port, 4.5inch deep.

Is this correct? - I wasn't certain about the value of Fb

So...assuming this is right, I can make a 24*45*115cm (WDH) enclosure (plus a bit extra for speaker displacement). I've not made my own set of speakers before, so do you think I should keep it this simple, or consider increasing the size to incorporate a transmission line?

  Reply With Quote
Old 1st March 2012, 12:36 PM   #4
c1d2f3 is offline c1d2f3  United Kingdom
diyAudio Member
Join Date: Feb 2012
How can I move this thread to the multi-way section... sorry, wasn't paying attention when I posted!
  Reply With Quote
Old 1st March 2012, 12:50 PM   #5
iko is offline iko  Canada
diyAudio Moderator
iko's Avatar
Join Date: May 2008
Location: Toronto
PRO-9TL leftovers
  Reply With Quote
Old 1st March 2012, 03:11 PM   #6
sreten is offline sreten  United Kingdom
Join Date: Nov 2003
Location: Brighton UK

I simmed it using your numbers and its OK with a 100L box tuned to 25Hz.

rgds, sreten.
  Reply With Quote
Old 1st March 2012, 08:34 PM   #7
c1d2f3 is offline c1d2f3  United Kingdom
diyAudio Member
Join Date: Feb 2012
I've done a quick mock-up to scale, with an internal volume of about 120 litres and a port on the back near the top.

Any thoughts, comments, suggestions??

I'm not too sure about the height of the woofer and port yet, that will be the next hurdle! Also, I'm tempted to mount the tweeter behind the front panel with a wave guide to make it a bit neater.
Attached Images
File Type: jpg Assem2.JPG (220.3 KB, 59 views)
  Reply With Quote
Old 1st March 2012, 09:39 PM   #8
PeteMcK is offline PeteMcK
diyAudio Member
Join Date: Feb 2002
Location: Western Sydney
If size is a concern, you could probably get the cab down to ~ 60L at the expense of a few Hz, you'd still be in the mid 30s
Impedance varies with frequency, use impedance plots of your drivers and make crossover calculations using the actual impedance of the driver at the crossover frequency
  Reply With Quote


PRO-9TL leftoversHide 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
Harris Tech BassBox Pro/Xover Pro + CD ROM kingfisher Swap Meet 0 17th February 2012 04:14 PM
Fostex leftovers singles, blemished, wierd planet10 Swap Meet 1 15th November 2010 06:22 PM
Building from leftovers, advice on mixing impedances djfoundation Multi-Way 5 12th February 2010 06:28 PM
a few more leftovers FS cadmaniac Swap Meet 3 29th January 2004 05:43 PM
Riken-Ohm Leftovers Pkg Deal cadmaniac Swap Meet 3 3rd January 2004 02:17 PM

New To Site? Need Help?

All times are GMT. The time now is 10:01 PM.

Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.00%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio