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Flat Wall Mount Stereo MLTL using TC9FD's (2)
Flat Wall Mount Stereo MLTL using TC9FD's (2)
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Old 30th July 2015, 11:35 AM   #1
xrk971 is offline xrk971  United States
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Flat Wall Mount Stereo MLTL using TC9FD's (2)
Default Flat Wall Mount Stereo MLTL using TC9FD's (2)

This thread is being started as an OT discussion from the Tabaq thread. The design is a compact flat wall mountable stereo speaker that has great midrange clarity and pretty decent bass extension due to the mass loaded transmission line (MLTL) approach that was added to the original design based on this thread. The original open-ended TL design looked like this:
Click the image to open in full size.

I modified the dimensions of that design to fit two speakers on a single panel of 20in x 30in foam core board. The revised design plan is as follows (added 1.0in x 2.2in x 2.44in long vents):

Click the image to open in full size.

Here are some photos of what it looks like:

Click the image to open in full size.

Close up of the constrictor vent:

Click the image to open in full size.

If you want, you can decorate with a picture frame (the craft stores have a ready-made 20in x 30in frames in stock) and a poster or picture to look like this (this one has a built in class D amp and BlueTooth connectivity in addition to 3.5mm stereo jack):

Click the image to open in full size.

Several people have built this with good success. Some have split it off to be a single (non-stereo) speaker.

Here is a sound clip:
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Here are measurements of the vent bass output:

Click the image to open in full size.

Here are more recent measurements from a meter away with speaker mounted on wall at 53in driver height from floor. The wall and room combine to extend the bass to a very deep 30Hz, albeit lower amplitude (but still very present). The drop off below 100Hz is due partly to room modes and also just fall off with distance:

Click the image to open in full size.

The impulse and step response are quite nice:

Click the image to open in full size.

Last edited by xrk971; 31st July 2015 at 06:15 PM.
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Old 30th July 2015, 11:50 AM   #2
sayrum is offline sayrum  Germany
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Hey X
i also build the Vifantastisch and like the sound of the original build.
But your measurements
http://www.diyaudio.com/forums/attac...-freq-resp.png
look intriguing, what are the exact dimensions of your constrictor vent?
I want to try it out

Cheers
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Old 30th July 2015, 11:59 AM   #3
xrk971 is offline xrk971  United States
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Flat Wall Mount Stereo MLTL using TC9FD's (2)
Quote:
Originally Posted by sayrum View Post
Hey X
i also build the Vifantastisch and like the sound of the original build.
But your measurements
http://www.diyaudio.com/forums/attac...-freq-resp.png
look intriguing, what are the exact dimensions of your constrictor vent?
I want to try it out

Cheers
Hi Sayrum,
It was you who turned me into this speaker and the TC9FD. The constrictor is in the drawing - probably not clear but 1.0in x 2.2in x 2.44in long. Note that my main box size is different to fit sheet of foam core.

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Old 30th July 2015, 12:00 PM   #4
smksoba is offline smksoba
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Quote:
Originally Posted by xrk971 View Post
That was one of my first speakers that I built. It sounds much better with a modification that turns it into a MLTL. The bass is much deeper and the overall sound is smoother. The open ended TL has very little bass and lots of harmonics leaking out.

Foam Core Board Speaker Enclosures?
do you mean this one ???

Accidental MLTL Technique

can you give detail box dimensions ?
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Old 30th July 2015, 12:15 PM   #5
sayrum is offline sayrum  Germany
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Hey xrk971

Quote:
Originally Posted by xrk971 View Post
Hi Sayrum,
It was you who turned me into this speaker and the TC9FD.
I know. Am glad you took it as an incentive and went to develope your own speakers
and to introducing here in the full range forum more measuring + judging by ones own listening experiences and less just "believing" hypes about certain drivers + what they are supposedly capable of...

So the vent is 1" + 2.2" and extends 2.4" into the line?

Sorry for the OT!

Last edited by sayrum; 30th July 2015 at 12:20 PM.
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Old 30th July 2015, 01:48 PM   #6
xrk971 is offline xrk971  United States
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Flat Wall Mount Stereo MLTL using TC9FD's (2)
@Sayrum:
Quote:
So the vent is 1" + 2.2" and extends 2.4" into the line?
Yes.

@smksoba: see plan in above post #1141. The one you referenced is different - its thicker and more compact and I did not like the sound as much.

Last edited by xrk971; 30th July 2015 at 01:58 PM.
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Old 30th July 2015, 02:35 PM   #7
smksoba is offline smksoba
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Quote:
Originally Posted by xrk971 View Post
@Sayrum:
Yes.

@smksoba: see plan in above post #1141. The one you referenced is different - its thicker and more compact and I did not like the sound as much.
thanks

how much distance from center speaker to left box or right box (red line at attachment ) ?

speaker box can be split into two speaker boxes ???
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Old 30th July 2015, 03:06 PM   #8
xrk971 is offline xrk971  United States
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Flat Wall Mount Stereo MLTL using TC9FD's (2)
Quote:
Originally Posted by smksoba View Post
thanks

how much distance from center speaker to left box or right box (red line at attachment ) ?

speaker box can be split into two speaker boxes ???
About 20 in C-T-C. Yes, you can split into 2 boxes.
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Old 31st July 2015, 02:04 PM   #9
smksoba is offline smksoba
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@xrk971

your speaker box dimensions for inside box or ouside box ??
I have create box plan for 12mm MDF , it's correct or wrong ?
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Old 31st July 2015, 02:12 PM   #10
perceval is offline perceval  Taiwan
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Guys, maybe you should tag along a more relevant thread, or start a new one, as this is for the TABAQs.

Anybody looking for plans about the Vifantastisch will probably not think of looking in the TABAQs thread.
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