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Old 12th July 2009, 06:43 PM   #1
hagr is offline hagr  Norway
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Default DIY center BLH with Fostex FE206E?

Hi! I want to build a center to match my upcoming Jericho-horns with Fostex FE206E. I have never seen such a thing, but maybe you have? I'm thinking of a single small double mouth back loaded horn.

Can anyone help me?

Harald
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Old 13th July 2009, 09:27 AM   #2
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You're not likely to reap many benefits from back-loading the 206 for that duty -not like that anyway. Centre channels don't need to go low, so you'd probably be better off running it either sealed, or in a short, front-loading waveguide. I'm not sold on the idea of low-mid back-horns. Alternatively, just don't bother with a centre-channel & run phantom centre. Personally, I prefer it to a separate centre speaker, but YMMV of course.
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Old 13th July 2009, 03:23 PM   #3
hagr is offline hagr  Norway
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A simple sealed box will be considered

I've been looking at a couple of Spawn horns but unfortunately, they all seem a bit big for my use.

The main reason I want to use a horn construction is that I want the sensitivity of the Jerichos (about 100dB/2,83v/M) and also match the look, but if I can't find any that fits my needs perfectly I'll build something more simple.

Harald
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Old 13th July 2009, 03:32 PM   #4
hagr is offline hagr  Norway
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http://cardersound.tech.officelive.c...chaseInfo.aspx

Scroll a bit down this page, and you will find a center with a Fostex fullrange driver. That's kind of what I'd like to build, but it's not a problem if it's slightly bigger
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Old 13th July 2009, 03:58 PM   #5
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I know the Spawn & CarderSound boxes well, primarily because I designed them, with the exception of the Morgan sub. The Kyler / Jade boxes you're refering to are essentially multi-purpose cabs.; they can be used as mains or surrounds, or as a centre channel. Different general requirements -different driver too, that needs to be handled in a different way. Remember, a BLH of any kind is really only useful below the driver's mass-corner, so when the bandwidth it's going to be covering is already above the driver's mass-corner, much of it's purpose in life is lost.

BTW -the Jericho is not really 100dB. Well, it is & it isn't. Across it's operating BW, it is, give or take (from about 50Hz - 300Hz). Everything above that is simple direct radiation from the driver & the efficiency you get is what it inherently posesses, which is about 95 - 96dB 1m/1w in practice.
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Old 13th July 2009, 04:43 PM   #6
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Instead of sealed, would aperiodic be a better approach? It's true you don't need the low frequency boost from a horn, but you don't want the rear wave locked up inside the box do you?
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Old 13th July 2009, 05:25 PM   #7
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While many might maintain that the center channel is the most important one for dialogue, etc, it doesn't contain a lot of low frequency information, so why expend the various associated costs (i.e. physical box dimensions, driver cost) ?

You could probably get a pretty close match to the tonality of the FE206E with either a single FE166E or even a pair of FE126E, either of which would require a much smaller box. As for difference in theoretical sensitivity, there should be more than enough adjustment in the HT processor to accommodate for that.

Actually, based on my experience with HT processors/receivers, I'd be inclined to suggest that the difference in tonality between the 206 and FE167 might well be swamped by the electronics, and I know for sure the latter driver works very well for this purpose in a pretty simple and compact sealed enclosure.
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Old 13th July 2009, 06:19 PM   #8
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Quote:
Originally posted by hagr
Scroll a bit down this page, and you will find a center with a Fostex fullrange driver.
I'll add something Scott didn't say... if you scale that box for the larger & lower Q FE206e you end up with the Carder Madison (or Sachiko, for DIYers)

dave
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Old 13th July 2009, 09:55 PM   #9
hagr is offline hagr  Norway
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Thank you for lots of great information I will play a bit with a couple of drivers in WinISD and decide what I'm going for then!

I think I will drop the horn and put the driver(s) in a sealed enclosure

Harald
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Old 13th July 2009, 11:09 PM   #10
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You're welcome.

It'd certainly make life easier. And remember, you could always add a form of short front horn / waveguide to it if you felt so inclined.
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