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Old 1st October 2006, 03:36 PM   #1
badman is offline badman  United States
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Default Fostex plus Heil

Pardon the mess please!

The rig: active biamp of the big heils with fostex FF225k in "Rethm the second" cabinets, first order at 4600. SET on the heils, UCD on the fostex. For those uninitiated with the Rethms, they're sort of a hybrid horn/acoustic labyrinth designed for use with lowthers.

Questions? Comments? Moans and Groans? I'm working on some neat stands for the heils to match the rethms. It's pretty neutral and transparent though Click the image to open in full size.
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Old 16th October 2006, 03:04 PM   #2
badman is offline badman  United States
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Default New stands to match the rethms

Tall stands, details and pic at

Stands on a blog!

Oak, PVC, expanding urethane, and ply with heils on top! Sounds great, XO has been moved up to 6500Hz, still first order active. The heils and these fostex have very similar dispersion characteristics even that high, which is a major shortcoming in many midwoof+tweet designs.
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Old 21st October 2006, 12:02 AM   #3
JandG is offline JandG  United States
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Default I like that alot.........

That system is nice ......I like the way it is set up. I am in that sort of land also. I see some seroiuse good sonics happening there. I am intrested in the Heils's I use the Fountek neocd3 now, to get a taste.. a fast 4" Coral & active bottom @ 140 . please give some insight to how it perform sonically. I could care less about any measurements.....
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Old 21st October 2006, 12:11 AM   #4
v-bro is offline v-bro  Netherlands
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Would they be to high when mounted on top of the Rethms?

It would help against reflections and improve point-source behavior...
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Old 23rd October 2006, 01:39 PM   #5
badman is offline badman  United States
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v-bro: On the link from the second post, you can see some taller stands I did to reduce reflections. Yes, I know top mounting would be an improvement in point-source behavior, and am considering it, however I'm concerned about getting the mounting stable enough, I sure don't need the heils falling off the speaker onto my kid's head, those suckers are heavy!

JandG, well, sonically, they're pretty good, though I am still fiddling with the crossover and some other items (just revised my preamp last night too). Very transparent, but I don't know that the fostex are keeping up with the heils that high up, there seems some detail lost.

I'll keep this thread updated as it progresses, certainly it's a unique sort of setup.
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Old 24th October 2006, 03:12 AM   #6
badman is offline badman  United States
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Lightbulb Sometimes it just takes.....

Sometimes it just takes someone pointing out what you already knew... Click the image to open in full size.

improvements galore, as you might expect.
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Old 24th October 2006, 10:17 PM   #7
v-bro is offline v-bro  Netherlands
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Quote:
Originally posted by badman
Very transparent, but I don't know that the fostex are keeping up with the heils that high up, there seems some detail lost.
Did the new setup solve any of this?
My guess is it did...

this is my setup:

("Quad" esl-57 treble panel combined with 10" "Precision devices" custom sub in TL cabinet).

It may look shabby, but it sounds really sweet...
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File Type: jpg slak2.jpg (57.3 KB, 263 views)
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Old 25th October 2006, 01:51 PM   #8
badman is offline badman  United States
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Yeah, there's some good improvements in terms of perceived detail and transient speed. The fostex isn't a plodding clumsy beast by any means, having a very very low Qts and super motor. Nice setup, where are you crossing the quads over?
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Old 25th October 2006, 01:54 PM   #9
v-bro is offline v-bro  Netherlands
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About 200-250 hz. Use a DIY-ed version of Marchand xm-46 at the moment, lovely simple technique and easy to tweak and not expensive way of filtering....
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Old 25th October 2006, 02:33 PM   #10
badman is offline badman  United States
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Hehehe, the marchand circuits are very effective. I use the XM-126 (the tube one with outboard PSU), and I love the ability to swap the filter boards out and control both frequency AND slope, most analog crossovers only let you control frequency.
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