Thinking Marty but manufacturer recommends sealed - thoughts? - AVS Forum | Home Theater Discussions And Reviews
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post #1 of 7 Old Yesterday, 09:05 AM - Thread Starter
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Thinking Marty but manufacturer recommends sealed - thoughts?

As my fellow Canadians will attest, getting our hands on a performing sub is difficult and very costly shipping these behemoths across the border. In the very little research that I've done these are looking like a great deal and Canadian to boot http://www.istonline.ca/mach5_ftw_lte.html.

I like the idea of the Marty enclosure but need some guidance. IST recommends a 300L (roughly 10ft) sealed enclosure. Does this mean it will not perform well ported? I'm not against sealed but thought I could get more out of the subs this way, not to mention the tried and tested simplicity of the Marty.

FWIW the room is 20'x16'x9', I was going to start with 2 up front adding near field afterwards if required.

Appreciate the input.
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post #2 of 7 Old Yesterday, 09:46 AM
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Software model the driver in the proposed enclosure and you'll know. If you don't have that ability then use a driver that's specifically recommended for use in the proposed enclosure. That said, a Qes of .70 indicates a driver intended for sealed or IB use.

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post #3 of 7 Old Yesterday, 06:41 PM - Thread Starter
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Qes? Boy I still have a lot to learn.
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post #4 of 7 Old Yesterday, 07:18 PM
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Did you see/read the DIY FAQ yet?
New to DIY? FAQ's in here

Lots of good info there. Really though I think you might just need to do some more research. Being able to model a driver in different enclosures is invaluable.

If you want to keep it simple, a great way to do that is to follow someone else's model (driver + enclosure).
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post #5 of 7 Old Yesterday, 07:51 PM - Thread Starter
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Agreed, thanks for the reference. Part of me was hoping for a quick drop in solution, it's been a daunting build so far!

Off to learn.
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post #6 of 7 Old Yesterday, 08:02 PM
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Processor - Marantz AV7702, Speakers - Chane A5rx-c (LCR), UAC-8.2 rears. Subs - Mach 5 IXL-18's. Amps - Sherbourn PA 7-350, iNuke6000DSP, D2L-SUB4-For Sale. Sources - Mac Mini, Oppo 103. Display - Epson 3500, Screen - DIY AT Spandex 100"

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post #7 of 7 Old Today, 03:02 AM
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hi Gouie

for a driver to work well in a ported cab, it usually has to have a little stronger motor system than for a sealed cab. otherwise, the big increase from the port doesn't really kick in (unless the cab is made unrealistically large).

here is an example of three subs for comparo with the ftw 21 LTE, 1000 watts into each system.

1. blue line is 21 ftw lte in 10 c.f. sealed.
2. red line is same in mini-marty type cab (~9 c.f. tuned to ~17hz)
3. green line is 64 cubic footer tuned to 16hz.


so what can be seen here is that going ported in a medium size cab doesn't pay a whole lot of dividends, but if you can go to ludicrous size, you can pick up quite a bit of output. I'm actually not sure what the excursion limits on that driver are (specs indicate 3 inch peak to peak which is about 37mm each way). if that's the case, that output or something close to it should be within reach.







while more expensive, the uxl18 is an excellent choice in the larger marty's.
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