MTM TL Project - diyAudio
Go Back   Home > Forums > Loudspeakers > Multi-Way
Home Forums Rules Articles diyAudio Store Gallery Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

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
Thread Tools Search this Thread
Old 8th October 2005, 10:42 PM   #1
diyAudio Member
Join Date: Dec 2004
Location: Payette, ID
Default MTM TL Project

Just finished my MTM TL, ala D'Appolito, project. I used different drivers, partly due to money considerations and partly to try something different. I used Dayton DC160-8 61/2" midbass and Vifa D25AG-35 tweeters. I used 2nd order Linkwitz-Riley filters to crossover at 1800 Hz. The midbass impedance was equalized at 6 Ohms to match the tweeters.

At first I thought the system was a little metalic sounding, but after a few weeks of break in I was very satisfied with what I was hearing. The highs were crisp and accurate; the mids were pretty good, considering the drivers; the bass was a little weak, but acceptable. The sound stage was a little forward, but also acceptable. My over-all impression was very good bang for the buck ($350 including MDF enclosures and Solen/Mills/Jantzen foil

I drive the speakers with an LM3886 Chipamp directly from a Sony ES series CD. The Chipamp seems to drive the 6 Ohm system quite well. Next project will be a DAC and Preamp.

Attached Images
File Type: jpg 2.jpg (54.0 KB, 473 views)
  Reply With Quote
Old 9th October 2005, 03:49 AM   #2
diyAudio Moderator
wintermute's Avatar
Join Date: Aug 2003
Location: Sydney
Blog Entries: 22
Very nice

I know what you mean about metallic sounding, I have heard those D25's before and didn't like them for that reason, maybe I would get used to it not sure...... I'm very much in the soft dome camp

Any intelligence I may appear to have is purely artificial!
Some of my photos
  Reply With Quote
Old 9th October 2005, 04:41 AM   #3
GM is online now GM  United States
diyAudio Member
GM's Avatar
Join Date: Jun 2003
Location: Chamblee, Ga.

Interesting! This is the only Vifa tweeter I've auditioned that I thought sounded anywhere near close to 'accurate'. Oh well, I guess it's due to decades of listening to alum. diaphragmed horn drivers which are much more highly damped than a point source tweeter. If you're in an experimental mood you can lightly coat them with Damar varnish to damp their >20 kHz break-up modes a bit. Give them a few days to dry before energizing them.

When you say 'TL', do you mean ML-TL? FWIW, the Qts is a bit low for a ML-TL and way too low for a TL to get good LF extension so either would require some BSC to be tonally balanced in-room unless you designed them as a 2.5 way.

Anyway, lookin' good!

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 2005, 09:17 AM   #4
diyAudio Member
Scottmoose's Avatar
Join Date: Mar 2005
Location: UK
Is it me, or do these look similar to the Thor?

Not bad at all -very impressive in fact. How did you calculate the dimensions / TL type? Oh -one suggestion; if you still find the sound a bit forward, try adding a little series resistance to the mid-bass drivers, or even overall, in the lead from the amp. Only problem with that is, it might push your chip amp into clipping. Still, worth a try.
  Reply With Quote
Old 11th October 2005, 03:18 PM   #5
diyAudio Member
Join Date: Dec 2004
Location: Payette, ID
Hi Scottmoose,

The enclosure is a copy of the Thor. Since I know just enough to be dangerous about speaker design, I searched for lower-cost divers that were close in specs to the original. My plan was to give it a try and if I didn't like it I could spend the $ later on the Seas.

Thanks for the suggestion concerning the forword sound stage; I will experiment with it. I'm still in the process of tuning the line and experimenting with different amount of stuffing.

  Reply With Quote
Old 12th October 2005, 08:42 AM   #6
diyAudio Member
Scottmoose's Avatar
Join Date: Mar 2005
Location: UK
I thought as much. They look very good to me!

One or two suggestions to try out / refinements. Joe seems to have got the Thor enclosure a bit mucked up, and using drivers similar to the originals, it'll have a significantly rising response over 100Hz. He appears to have forgotten paralleling two drivers doubles Vas, so the twin driver[s] see a half-sized enclosure. This gives the forward presentation and light bass you mention. Something interesting for you to try as you're still experimenting: temporarily disconnect one of the two mid-bass drivers. My bet is you'll find a flatter response with better bass performance and a less forward presentation.

With twin drivers, I reckon increasing the stuffing desnsity in the rear part of the line to 1 lbs to the cubic foot will help a bit. Some series resistance (probably about 5ohms) in the hot lead to the mid-bass units should help too, or better, try parallelling the resistor with something like a 2.5mH inductor which should tame it completely. Better bass response, greater soundstage depth and a less forward presentation should be the result.

  Reply With Quote


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
CDPRO2 Group Project (open source project) BrianGT Digital Source 147 8th August 2008 12:37 PM
My OLD Project....... cheap tube audio project!!! tube-lover Tubes / Valves 4 8th May 2008 10:26 PM
first project ceebmoj Full Range 5 23rd January 2008 08:51 AM
My first project, cool project. sorinsistem Solid State 3 19th January 2006 06:08 PM

New To Site? Need Help?

All times are GMT. The time now is 04:57 AM.

vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2016 DragonByte Technologies Ltd.
Copyright 1999-2016 diyAudio

Content Relevant URLs by vBSEO 3.3.2