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Old May 15, 2011, 11:54 PM
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Phill Phill is offline
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Join Date: Mar 2007
Location: Morden MB
Posts: 591

My System Specs

Default Sub Transmission Line

I hope my thread is not too OT but I thought I would throw my question out there and see if something sticks.

My plan is to build a Transmission Line for a Type R 12 Alpine sub for HT use. I want to use a TL bc I can tune it by length to the "exact" resonant frequency of the sub which happens to be 26hz. That means I will need TL in the length of just over 10.5 feet. AFAIK the math goes: 1100(ft per sec)/26hz(free air resonance of the driver)=42.307ft(size of the wavelength at the fq) I plan the TL to be 1/4 the wavelength and that is how I arrive at ~10.5 feet. I plan on using 12" Sono-tube for the construction of the TL and then fill it with poly-fill as need to adjust the sharpness of the sub response. For an amp I want to use a Alpine MRV-T707 bridge to mono @ 4ohms. I am hoping for an output of ~400watts RMS from the amp but I have not actually checked to see what it can deliver in the real world.

The idea is that my HT needs a lot of help below 40hz and this home brew TL is supposed to be a solution. I have considered SVS subs or a Dayton Sub kit but seeing as I have most of the parts to build a TL I thought it was worth a shot

I would appreciate any questions or suggestions or comments. How do you think this will turn out?

For a visual of what I am talking about here is a pic of two Transmission Lines. I will be making just one. TBH my TL will have to lie on the floor bc I have 8ft ceilings.


Here you can see that the interface to the sub is rather simple to build and should not take long to make.


(Pics are from "The Legend of EL PIPE-O")
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