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Old 23rd September 2005, 06:28 PM   #1
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Default Possible wide baffle project

Okay, the room is finally clear after a serious and painful sort-out. Several old prototypes have been binned. My much loved Ariels have been sold on, as have a couple of pairs of MLTLs, whilst the open-baffle project, now complete, has been placed in storage with the Tannoys until I have a larger room. Iím once again building a pair of Martinís ML TQWT (my third pair Ėthe first two have been swiped by friends), which will be my regular listening speaker. They should be finished and in-place by the end of the weekend.

But now, thanks to my post summer clean-out I have a pair of FE207Es and a couple of spare sheets of MDF lying around. This is an unnatural state, and something must be done. Especially as I like to have a project to work on over the winter. So hereís the idea. Iíve already built a pair of Martinís MLTLs with the 207, and liked them a lot. And of late, Iíve got interested in the considerable potential wide-baffle speakers offer, so the idea of combining them has some appeal. Iím still at the kicking ideas around stage, but so far, the dimensions mooted are as follows. Line length remains the same (obviously) at 42Ē. Width triples to 28.5Ē, and depth reduces to 4Ē. The front baffle is slightly curved backward to maintain the same So and Sm dimensions. The driver will be mounted on a false-baffle to allow it to fit within the shallower cabinet.

OK, thatís the plan gentlemen (and any ladies out there). Any thoughts or comments on it will be greatly appreciated

Cheers
Scott
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Old 23rd September 2005, 10:32 PM   #2
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Interesting...one thought comes to mind. Since you like the MLTLs you built, you could simply make only the front board wider/taller and keep the box the same behind the baffle.

One other thought, Tom Z has put a box design together for the FR125 that essentially is a wide horn of sorts. (check out www.fullrangedriver.com) He said he tried many boxes and this design really works. I wonder if it could be adapted for the 207??

Best of luck.
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Old 23rd September 2005, 10:39 PM   #3
Dumbass is offline Dumbass  British Antarctic Territory
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Even though the baffle would be wide, the driver would be still very close to top, right? And chance of moving the driver down a bit?

Have you tried any phase-plugging? I recently installed the wrench socket phase plugs on my FE207E, was very pleased with what it's done to the upper mids and highs.
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Old 24th September 2005, 10:57 AM   #4
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Shifting the driver in an MLTL is a little tricky due to the way the line works. I'll play around in MathCad for a bit and see what gives before starting any work.
I haven't tried any phase-plugs -yet! Actually, I've been meaning to for a while, so this should be the right time to try it out!

Those FR125s sound interesting too -I'll have to think about that...

Cheers for the input
Scott
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Old 24th September 2005, 06:48 PM   #5
Dumbass is offline Dumbass  British Antarctic Territory
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One more thought, with the shallow enclosure you might end up with not enough depth for the port (you want at least 2" between the inside end of port and the back wall IIRC). So consider venting to the side (mirrored pair, natch). Or you could set up a stand like the Jordan VTL and downward vent, or stand with reflector like this:
http://www.quarter-wave.com/Gallery/Jay_ML_TL.jpg
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Old 24th September 2005, 06:54 PM   #6
Dumbass is offline Dumbass  British Antarctic Territory
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Oops, one more idea. Instead of changing the driver position, just have the front baffle extend upward beyond the enclosure. Or just build a taller box and put a partition in there to keep the TL dims the same.
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Old 25th September 2005, 02:16 PM   #7
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Both good suggestions -many thanks, I'll include them in the design I'm drawing up
Cheers
Scott
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