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Old 4th March 2005, 06:29 PM   #31
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I'm thinking of a setup like this..

The rear of the ob betas exposed to a somewhat damped alcove. The horn sub integrated into the cabinetry. The horn mouth firing into the corner of the room directly at a concrete foundation wall. The wall behind the cabinet is concrete as well. I know it would be nice to get the mains further out but I think the 24" is about all I will be able to get away with due to the dang WAF!

Comments, criticism?

Any good articles on horn design someone can point me to? A single driver system would suit me fine for cost reasons. I wouldn't mind scaling a proven design to my dimensoins.(LABhorn maybe?) Does anyone think this will NOT perform well if implemented reasonably well?

Thanks guys..this early planning will make all the difference in the world.
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Old 4th March 2005, 07:10 PM   #32
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If that's a crt tv the woofer magnet will need sheilding. The same goes for the Beta 8cx. I find that polyfill and/or thin open cell foam behind the driver helps tune an OB for near wall placement.

The 8cx makes a nice center channel, but I'd let it breathe too. However, it will sound too thin by itself due to the much lower Qts. If you go with the 8's they'd need something to help fill in the bass. I highly recommend OB for the center too because it's primary load is dialogue and OB is outstanding for more natural sounding dialogue (no more "what did he say?").
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Old 23rd July 2005, 02:54 PM   #33
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OK,
I'm still thinking about this and have a set of beta 12cx's..

Specifications: * Power handling: 250 watts RMS * Voice coil diameter: 2" * Le: 1.01 mH * Impedance: 8 ohms * Re: 5.57 ohms * Frequency range: 45-20,000 Hz (with PSD2002 driver and pxb2-1k6 crossover) * Magnet weight: 38 oz. * Fs: 43 Hz * Vas: 5.66 cu. ft. * Qms: 6.69 * Qes: .51 * Qts: .48 * Xmax: 3.0 mm (spl~97dB 1w/1m)

I will be using the psd2002 compression driver (spl~105 dB 1w/1m) and ~10 watt mini Aleph for same.

~25 watt Aleph for the woofer in the CX. Active Xover

My goals are dynamics, impact, and clarity. I do need to keep the footprint and size down. In other words..no 2.5 ft3 box here! I will be using a sub. I am thinking response solid to 50hz or so will do me just fine

My question for all..and GM.

If I decide on OB...how wide does the baffle have to be?(prob too wide for me)
Can I just use an open back box?

Does anybody have any suggestions on an alignment/setup that will not sacrifice dynamics yet fit in a not too big footprint. I am thinking It is possible since I'm not asking for low bass.

All suggestions are welcome..thanks
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Old 23rd July 2005, 04:38 PM   #34
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I've had really good success with open box type shapes, but not with the sides at 90 degrees because it imparts a boxy sound. Make the front only wide enough to fit the driver and splay the sides at least 1" for every 6" of depth. You'll have to experiment to decide what you like best and you'll definitely need at least some polyfill on the backside since you are that close to the wall. My guess would be sides or "wings" of 8" & 9" will suit your needs and you will probably need a top cap.
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Old 23rd July 2005, 05:17 PM   #35
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Quote:
Originally posted by johninCR
I've had really good success with open box type shapes, but not with the sides at 90 degrees because it imparts a boxy sound. Make the front only wide enough to fit the driver and splay the sides at least 1" for every 6" of depth. You'll have to experiment to decide what you like best and you'll definitely need at least some polyfill on the backside since you are that close to the wall. My guess would be sides or "wings" of 8" & 9" will suit your needs and you will probably need a top cap.

This is EXACTLY what I had in mind. Thanks for the post, I now see it as worth experimenting with.
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