ml tqwt with unknown driver - 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 31st July 2008, 05:45 AM   #1
diyAudio Member
 
Join Date: Aug 2004
Location: sunny Queensland
Send a message via Yahoo to stevodude
Default ml tqwt with unknown driver

Hi guys, I like the shape and stance of this enclosure:

mjk's project 2 ML TQWT -
Click the image to open in full size.

http://www.quarter-wave.com/Project02/Project02.html

Now the nearest info I could find on the driver was this sheetclick on it and zoom in in picasaweb)

Click the image to open in full size.

and another that say Fs was 55Hz.

Will this go in one of these? I mean I'm going to give it a go anyway, but I'm not sure of the dimensions of the enclosire, nor the position of the driver.

Cheers, stevo.
  Reply With Quote
Old 31st July 2008, 10:28 AM   #2
diyAudio Member
 
Scottmoose's Avatar
 
Join Date: Mar 2005
Location: UK
Looking at that, I have my doubts. That page indicates that they were used when new in slotted (nee ~resistive vent) boxes, suggesting to me they're a high[ish] Q design. If so, you'll likely get an uncontrollable bass response as-is.

FWIW, I just ran a check on that box with the high Q Visaton B200 just to see what's going on with a unit of that sort. As-is, response is what you'd expect (vile). However, if you damp / stuff the entire cabinet, and stuff the vent too to make it a quasi aperiodic alignment (while keeping the aesthetic of the cabinet), it does passably enough down to about 50Hz or so.
__________________
Community sites www.frugal-horn.com http://frugal-phile.com/
  Reply With Quote
Old 31st July 2008, 12:05 PM   #3
diyAudio Member
 
Join Date: Aug 2004
Location: sunny Queensland
Send a message via Yahoo to stevodude
So, basically I'll be just using the design as asthetics only, and won't be helping the driver.

and is probably better of in a 2 way simple sealed/small ported enclosure being a high Q driver? correct?

can't be any worse than my beer box speakers LOL...

Click the image to open in full size.
  Reply With Quote
Old 1st August 2008, 04:21 AM   #4
diyAudio Member
 
Join Date: Aug 2004
Location: sunny Queensland
Send a message via Yahoo to stevodude
back on the transmission line enclosure, This is a quote from another website that I found someone new some information about the driver:

Quote:
dr.ido
04-01-2006, 11:13 PM
Here in Australia in the 60s and 70s a common speaker was sold under several different brand names (Kriesler, Pye, HMV, and probably others), but they were all basically the same. A single Magnavox 8WR or Rola C8MX (which were basically interchangable) in a ported box. The exact dimensions escape me at the moment, but they were all the same size. Only the finish, grill cloth and badges differed.

The Magnavox 8WR and Rola C8MX were both 8 inch drivers with 2 inch whizzer cones and pleated paper surrounds. Early versions have AlNiCo magnets, later versions are ferrite. AlNiCo versions are usually 15 ohm, ferrite 8 ohm, but some oddball ones show up (3.5 ohm Rolas and 27 ohm Magnavoxes).

I find the high end rolled off too early, they do need a super tweeter. In the slim line cabinets they are usually found in they lack bass, but they improve dramatically in a larger cabinet. They supposedly work well in a transmission line, but I have never heard them in one.
  Reply With Quote
Old 1st August 2008, 06:52 AM   #5
diyAudio Member
 
Join Date: Aug 2004
Location: sunny Queensland
Send a message via Yahoo to stevodude
OK, I am going to scrap that idea (again :-) )

so simplest build with best wide audio range for a pair of fe206e 's I can pickup from local company majormusic.com.au for $230 delivered for the pair.

I like a bit of bass, my hearing is probably half shot from the early eight's and being a drummer giging for 10 years, but I can still tell bad from 'thats nice' /nods head...

room is 3 meters wide (2.2mtr anamorphic screen), 9 meters long seats 9 people :-), and about 2.6 meters to ceiling.

music is pretty much mainstream rock/pop, small percentage classical/country, mostly David bowie style music:-)
amps are currently a JVC surround 70w x 6 , 70's JVC transistor amp 30 x 4, and a couple of diy tripath amps ( various stages of build).

Current mains are some floor standers, base reflex 3 x 8" bass , 4" mid 1" tweeter's which do great for moovies with plenty of punch for the video noise and bass. but want to be able to switch amps and listen to some nice clear music...

Metronome
simplest to build, 4 sides, top bottom, port. - can't find a plan for the fe206e

BIB
the calculator doesn't have the fe206e listed..

or bruce

price wise the metro's or the BIB would use about the same amount of wood and probably time aswell to build. The Bruce using more wood, and more time/effort to build.

I like the metro shape, the others are a bit square without doing something fancy with the shape.

Considering my wife works when I'm home, so shortest build period is not a requirement, but a preference :-)


please help me decide on a solution
  Reply With Quote
Old 1st August 2008, 07:15 AM   #6
diyAudio Member
 
AdamThorne's Avatar
 
Join Date: Oct 2006
Location: Los Angeles, CA
The metronome is simple conceptually, but depending on how anal you want to be about your construction making all those non-parallel cuts can be a PITA.

I'd bet the BIB is a simpler build.
  Reply With Quote
Old 1st August 2008, 11:27 AM   #7
diyAudio Member
 
Scottmoose's Avatar
 
Join Date: Mar 2005
Location: UK
Quote:
Originally posted by stevodude
Metronome
simplest to build, 4 sides, top bottom, port. - can't find a plan for the fe206e
Use the 207 dimensions. You might need to add more correction. You might not.

Quote:
BIB
the calculator doesn't have the fe206e listed...
Yes it does. And anyway, that's why they call them calculators: you can enter specs into both sheets yourself you know -all you need to do is type in the driver Vas, Qt & Fs.


Quote:
Originally posted by stevodude
or bruce
Decent but superceeded as-is by Chang now.

If you want quick / simple & have corners to load them into (they're corner horns) then the BIB would seem to a bit of a no-brainer.

Alternatively, as you like Martin's ML TQWT, why not use that. Using accurate 206 specs (average of 8 drivers) measured by Dave, from a technical POV it should work OK in that box, no modifications required, as shown below. I think it should squeeze in, physically.
Attached Images
File Type: gif ml tqwt 206.gif (5.7 KB, 403 views)
__________________
Community sites www.frugal-horn.com http://frugal-phile.com/
  Reply With Quote
Old 1st August 2008, 05:05 PM   #8
GM is offline GM  United States
diyAudio Member
 
GM's Avatar
 
Join Date: Jun 2003
Location: Chamblee, Ga.
Greets!

FWIW, I had some experience with the Magnavox circa '67 in a factory cab of ~8 ft^3 combined with a 2.2 uF capped off HF horn. It was open at the bottom and spaced up off the floor with 1/4" tall x 1" diameter furniture tacks according to my notes. This was the cab that taught me two valuable lessons WRT cab static and acoustic resistive mass loading when I 'cloned' it as a ~48" tall floor-stander by omitting its 3/4" thick slate top in-lay and naively converted its floor slit vent into a standard baffle thickness rectangular shaped one higher up.

What started out as a curiosity about how an acoustically too short TL might affect vent loading with cheap 'throw away' drivers turned into a minor cornucopia of speaker design insight that's dictated my cab layout preferences ever since.

Regardless, these I used are best suited for low output impedance, AM/FM, vinyl, systems of the day, so for today's wider BW sources it ideally needs a sub system and more extended super tweeters.

GM
__________________
Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.
  Reply With Quote
Old 4th August 2008, 04:40 AM   #9
diyAudio Member
 
Join Date: Aug 2004
Location: sunny Queensland
Send a message via Yahoo to stevodude
Thanks everyone.

I've done a basic model of the metronome for the fe207, which will fit the fe206e in no probs.

I've modeled it on 3mm Plate steel ( as I have quite a few large sheets lying around over at the farm shed. ), so once I finish weilding up my ride on mower , I'm going to build a pair of steel metronome's , if anything it will give me some more experience with the weilder. :-)

I've seen a BL horn built out of steel, and i want to give it ago, as all it will take is my time for welding, no other cost, so nothing to loose.

I've uploded my metronome sketchup into 3d warehouse if anyone wants it. Dimensions I just checked are slightly out :-/ but only by a couple of mm, soe probably won't make any difference.

Port I guess will be 3" (75) x 3"(75) long?
and basically line all the walls with some sound deadening, may not need any cotton fill?

Click the image to open in full size.
  Reply With Quote
Old 4th August 2008, 10:21 PM   #10
diyAudio Member
 
Join Date: Aug 2004
Location: sunny Queensland
Send a message via Yahoo to stevodude
oh and the BIB won't be any good as they won't be anywhere near the corners as I have the wide projection screen up to 1/2 meter off the wall and bass traps behind the screen and the theatre speakers in front of the edges, so the new full ranges will be infront (outside) the theatre speakers. (ie pretty close to the side walls).

next weekends project is cut the steel up for fitting and sand blasting, then tack welding. Then I'll have a go at a 2 pack gloss black.
they are going to be quite meaty looking I do believe
  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
Driver Rms-value unknown, what to do? mac-attack Subwoofers 9 7th January 2007 10:54 PM
ML-TL or ML-TQWT with very low Qt driver Henkjan Full Range 6 29th September 2006 03:29 PM
El W-3 871S is a god driver in TQWT? Jaime Full Range 1 19th May 2006 05:33 PM
Unknown fullrange driver bigwill Full Range 3 15th February 2005 06:30 PM
Unknown driver help postman Multi-Way 4 23rd September 2003 09:44 AM


New To Site? Need Help?

All times are GMT. The time now is 07:09 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