DIY MTM Transmission Line Design - Help Needed

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Hi All,
I am Saikat from India (Kolkata). This is my first post in DIYAUDIO.

I am planning to build my first DIY towers in next few months. After reading a lot about different designs, I've decided to go for a TL design. I've shortlisted the following drivers/components combo:

BAJAAO TriTrix MTM TL Speaker Kit Components Only Pair (this is the only site sells parts-express components in india)

The original parts-express link is here:

TriTrix MTM TL Speaker Components And Cabinet Kit Pair | 300-702


As per parts-express the design of the TL is lke this:

IMG#1
TriTrix_TriuneTLenclosuredwg.gif


I am considering another TL design as well. This design is having only 1 woofer. I'll modify the design for MTM later.

IMG#2
TransmissionLineSpeaker.png


Now my questions to experts are:

1. I do understand that the parts-express design is tried and tested but if I consider the later design (i.e. IMG#2) what could be the advantages/disadvantages of the same?

2. I've read that the parts-express TL produces around 75watt RMS. Is there a better solution I could get under 25K (INR) all inclusive? If I consider shipping+duty for india, the equivalent price would be around $200. Lets consider I have a budget of $200. It could be extended to $250 as well.

3. Should I go for the transmission line design? The primary usage would be for movies (60%) / music (40%) (sometimes its 70% movies and 30% music). I do have a pair of Monitor Audio BX2. If the DIY sounds better than BX2s, I could put them for surrounds as well.


If the DIY tower sounds better, I'll go for the DIY center as per the following design:

IMG#3
Tritrix10ltrsealed.gif
.

TriTrix design has been take from:
Tritrix_pg_3

But, in case my BX2s sounds better than DIY TL, I'll keep BX2s for LR and go for BX Center.

Suggestions/Opinions welcome. Please note I have a Yamaha A810 AVR and Yamaha YST-FSW050 Sub (in case that helps).
 
Hi All,
I am Saikat from India (Kolkata). This is my first post in DIYAUDIO.

I am planning to build my first DIY towers in next few months. After reading a lot about different designs, I've decided to go for a TL design. I've shortlisted the following drivers/components combo...


Now my questions to experts are:

1. I do understand that the parts-express design is tried and tested but if I consider the later design (i.e. IMG#2) what could be the advantages/disadvantages of the same?

Welcome to the forum!

Basically, none. Single unit of course, so less efficiency, power-handling & dynamic range. No driver offset so no additional help with suppressing harmonic modes (driver at the throat provides maximum excitation of the pipe fundamental & all harmonics). And from the look of it, the 2nd one isn't an especially great example of its type either.

2. I've read that the parts-express TL produces around 75watt RMS. Is there a better solution I could get under 25K (INR) all inclusive? If I consider shipping+duty for india, the equivalent price would be around $200. Lets consider I have a budget of $200. It could be extended to $250 as well.

Forget RMS. It doesn't mean much other than (very arguably) how much power is needed to fry the voice coil. Sensitivity is the more relevant guide in terms of output, i.e. how many decibels it will produce at 1m for either 1w or 2.83v input.

3. Should I go for the transmission line design? The primary usage would be for movies (60%) / music (40%) (sometimes its 70% movies and 30% music). I do have a pair of Monitor Audio BX2. If the DIY sounds better than BX2s, I could put them for surrounds as well.

Ultimately only you can make that decision. The TriTrix TL is a decent example of its type & its designer (Curt) certainly knows what he's doing. For the money, you're not likely to be able to do a great deal better. Different perhaps.
 
:cop:

Do you have permission to post the copyright marked images ?

I think Saikat followed "netiquette"
- origin of the image is detectable an even a written link to the original web page was provided

So, this quote is a merit for the Tritrix design, which is intended for diy builders, and the source is open access 🙂:note:🙂
 

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Hi All,
Thanks a lot everyone for your valuable suggestions.
I have taken some time and created another TL design with MTM layout in Sketchup.
Please find the images below:

IMG#1
An externally hosted image should be here but it was not working when we last tested it.


IMG#2
An externally hosted image should be here but it was not working when we last tested it.


IMG#3
An externally hosted image should be here but it was not working when we last tested it.


The front baffle design is same as Tritrix TL design. I've changed the waveguides. The front open port is inspired from PMC ATL design.
The design dimensions are 7.5"x36"x15" (Width x Height x Depth).

1. Could you please suggest what are the changes I should make in this design?
2. Is there a chance this might work better than tritrix default TL design? - considering the fact that I am going ahead with Tritrix drivers/crossover.
3. Should I go ahead with MTM design or MT/TM design? - for MTM layout, tritrix supplies two 8ohms mid woofers. If you suggest MT/TM layout please suggest any alternate driver option (8ohm) for this.
4. Tritrix comes with 2nd order crossover. Should I go for seperate crossover design (like 3rd order) for TL design? - In this scenario, I'll go ahead with seperate driver and crossover components.
 
You haven't attached any pictures, so we can't provide any suggestions.

Note that the TriTrix was sized using Martin King's alignment tables; it is not simply a shot in the dark. Re your other questions, see my previous post. As for the crossover, I'm not sure what you are asking when it comes to 'separate crossover.' The kit has a crossover with high pass & low pass filters designed for those drivers. Do you mean should you design something with higher acoustic slopes? If so, that's an entire new XO from scratch.
 
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@Scottmoose... thanks a lot for your valuable feedback. I do appreciate it.

I do consider myself a noob where DIY is concerned. However, I've decided go ahead with the TriTrix design only. What I've learned from this exercise is I need to read a lot going forward. 🙂
 
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