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Help me to design transmission line for TG9FD-10-04
Help me to design transmission line for TG9FD-10-04
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Old 26th June 2019, 05:50 AM   #1
gadut is offline gadut  Indonesia
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Help me to design transmission line for TG9FD-10-04
Default Help me to design transmission line for TG9FD-10-04

can anyone help me to design/calculate transmission line design for this driver? I'm not looking for any low bass, more to beauty design but not jeopardize the sound.

attached is my inspired design, but i have no idea on how to calculate the length or mouth/throat size (correct me if the terminology is correct). I will build it with stacked plywood cut.

really appreciate for the help

[ full custom ]ba Claw do horn FOSTEX FE108E MM-161S: Real Yahoo auction salling
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File Type: jpg vkraft2-img600x450-1491304710vvlezi5957.jpg (117.3 KB, 342 views)
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Old 26th June 2019, 02:20 PM   #2
xrk971 is offline xrk971  United States
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Help me to design transmission line for TG9FD-10-04
This driver can be substituted for almost any design that uses TC9FD - the T/S parameters are different but close enough in that both are moderately high Qts, Vas and fs is about the same.

Look at the project Index on post #1 of this thread: Foam Core Board Speaker Enclosures?

In particular, these prohjects:

Flat wall mount stereo MLTL with Vifa TC9FD:
Foam Core Board Speaker Enclosures? - Page 147 - diyAudio

Flat BIB or FIB with Vifa:
Terry Cain's BIB -why does it work and does anyone have those Fostex Craft Handbooks? - Page 516 - diyAudio

FIB alternate without V channel:
Terry Cain's BIB -why does it work and does anyone have those Fostex Craft Handbooks? - Page 512 - diyAudio

Folded bookshelf MLTL with Vifa:
Fostex Fe83en the right small box? - diyAudio

Curvy wall Tabaq with P830986 (Dec 23, 2015):
TABAQ TL for Tang Band - Page 119 - diyAudio

Scale this one by 70% and it should work - PMC inspired TL Monitor with DC28F and DC130A (Oct. 30, 2015):
Low-Cost PMC-inspired TL Monitor with DC130A and DC28F

And you can always use the AMLT technique if you have a moderate Qts driver:
Accidental MLTL Technique

If I had to recommend one, try the 0.40x Karlsonator (guaranteed to please and sound great), very easy to build - a TQWTL:
Mini Karlsonator (0.53X) with Dual TC9FD's

Click the image to open in full size.
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Last edited by xrk971; 26th June 2019 at 02:25 PM.
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Old 26th June 2019, 08:45 PM   #3
jimbro is offline jimbro  United States
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gadut - the speaker in your image is a back loaded horn, not a transmission line.
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Old 26th June 2019, 09:17 PM   #4
planet10 is online now planet10  Canada
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Help me to design transmission line for TG9FD-10-04
Quote:
Originally Posted by jimbro View Post
gadut - the speaker in your image is a back loaded horn, not a transmission line.
It should be noted that intended a horn and called a horn, it is actually a badly designed TL.

dave
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Old 26th June 2019, 09:40 PM   #5
jimbro is offline jimbro  United States
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Quote:
Originally Posted by planet10 View Post
It should be noted that intended a horn and called a horn, it is actually a badly designed TL.

dave

Or digestive tract
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Old 27th June 2019, 12:47 AM   #6
gadut is offline gadut  Indonesia
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Help me to design transmission line for TG9FD-10-04
@X
that are alot of samples that I can try, you make all of them look easy to build I just got new knowledge on TL length is 1/4 wavelength of Fs, i might experiment with 3" pvc pipe combined with knee connector to get desired length.

this new release driver seems also a good 3" driver and it's cheaper than the early popular SB65wbac

SB Acoustics :: 3” SB10PGC21-4<br><font color="#C70039">SHIPPING</font>

Quote:
Originally Posted by jimbro View Post
gadut - the speaker in your image is a back loaded horn, not a transmission line.
Quote:
Originally Posted by planet10 View Post
It should be noted that intended a horn and called a horn, it is actually a badly designed TL.

dave
I'm really confused with the terminology of TL, BLH or FLH or whichever the proper name, i just give it to you the master for their naming

beside looking beauty TL design, I want this build to replace my existing Creative T20 for my TV output. it lacks of clarity to fill my 5x6m family room
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Old 27th June 2019, 01:26 AM   #7
perceval is offline perceval  Taiwan
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The TG9, and its relative the TC9, have a high Qts that is not suited for a TL. You will not get the bass extension a TL can offer, and it will be in the same range as a normal smaller and easier to build vented box.

Same goes for that new SBA driver, which I'm still waiting for, as our local distributor hasn't received them yet.

Look at X's designs made for the TC9 to bring out the best from that little driver.

Also note that the 8 Ohm version performs better than the 4 Ohm.
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Old 27th June 2019, 04:00 AM   #8
gadut is offline gadut  Indonesia
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Help me to design transmission line for TG9FD-10-04
I just realized the 0.8 Qts, it seems TL should be dropped now. I'm focusing on the designs tha X provided
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Old 27th June 2019, 12:01 PM   #9
xrk971 is offline xrk971  United States
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Help me to design transmission line for TG9FD-10-04
You can still do mass loaded TL (MLTL), and some TL’s or even BLH’s can work with the TC9FD, and so I think TG9 will be very similar. They just need to be modeled appropriately. The 0.40x Karlsonator is a proven folded TL design with incredible sound and bass-gain. That is, it doesn’t need a baffle step compensation, in general.

It works so well, you can see that it has replaced a member’s commercially made studio monitors here:
Click the image to open in full size.

Btw, I made a BLH for the TC9FD very similar to the one you were looking at above, it just did not have enough bass gain - made lots of mid bass. This was before I k ew how to simulates speakers - so not saying it was a good design. But the characteristic sound was no where nearly as nice as the much simpler and compact 0.40x Karlsonator.
Click the image to open in full size.

A much better sounding BLH speaker is the Cornu and it’s not hard to make out of foam core:
Click the image to open in full size.

Click the image to open in full size.

There’s a whole separate thread in it.
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Last edited by xrk971; 27th June 2019 at 12:11 PM.
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Old 20th July 2019, 11:22 AM   #10
gadut is offline gadut  Indonesia
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Help me to design transmission line for TG9FD-10-04
while waiting wood filler dried on my subwoofer build, i started to build X design which i think it's simplest one. rabbet join result is getting better now
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