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Old 21st January 2013, 04:21 PM   #21
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Well that Fountek I liked in post #19 is new to me and really catches my interest. Not available quite yet though. Looks like it'll be around q = 0.8 in 25 to 30L if you stuff it full. Easily takes a 80hz cross over to bigger subs. Would cross nicely around 300hz. And only $55/ea.

You could do passive, it just takes quite expensive components. Most people would cringe doing this, but just use iron core inductors and non-polorized electrolytic caps. At least until you've got the cross over dialed in. You'll still be spending >$10 per inductor likely. But cheaper than buying amps and a dsp module. I can't offer much expertise on passive line level active, but parts are cheap for that IF you have the amps.

I tried starting a discussion around this very sort of thing here: Cross Over design and Woofer choices for FAST

But it didn't go very far other than me expressing how I would do it. Dave chimed in with a few of his thoughts. It might offer some help though.
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Old 21st January 2013, 06:01 PM   #22
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Given those constraints, CHP70 (Gem 1), makessense. They have the advantage over A7 that they will not expose the shortcomings of a typical HT receiver as much. Or as much as the FF85.

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Old 21st January 2013, 07:16 PM   #23
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Doesn't the CHP70 have a rolled off top end? I find my HT receiver rolls off the top unless I put it in Pure Audio mode (which can't be done for movies). So combined the top end may be very rolled off.

Just a thought.
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Old 21st January 2013, 07:32 PM   #24
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CHP70 (gen 2) has a shelved down top end. Those in Europe are in the enviable position to get gen 1 from Rudy while he still has stock, the gen 1 driver is broadly similar to EL70 -- the only direct comparison from Zia.

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Old 21st January 2013, 07:39 PM   #25
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Without really knowing what I´m talking about - wouldn´t the Fostex ff225wk work?

One would think that they sound somewhat similar due to material and suspension?

/P
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Old 21st January 2013, 07:50 PM   #26
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My set of FF225 are still sitting on the shelf. We have truly only evaluated the 3 smallest FFs, and the FF85 is a standout (except for lack of bottom).

FF225 also requires tweeter, and you would be getting potential bass performance that you would be throwing away.

dave

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Old 21st January 2013, 08:19 PM   #27
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So a ff85 on top with ff225 doing bass is a no-go?
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Old 21st January 2013, 08:28 PM   #28
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efficiency differences would mean need to bi-amp, and for the cash to buy FF225 you'd be way ahead with a traditional midbass.

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Old 21st January 2013, 08:59 PM   #29
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But.. they look so good.

Ok dave - thanks!
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