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Old 17th March 2006, 04:26 AM   #1
jdybnis is offline jdybnis  United States
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Default B200, corner loaded bass reflex?

Hi I'm looking for an enclosure for the B200 that will work well in a corner. I'm considering a 175L bass reflex tuned to 40Hz. The enclosure I prefer is roughly rectangular except the front baffle is angled in about 15 degrees. It is 48" high, 24" wide, 15" deep on one side and 10" deep on the other side.
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Old 17th March 2006, 04:32 AM   #2
jdybnis is offline jdybnis  United States
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The ML-TQWT posted by GM in the BIB thread is 250L. Can it be modifed to fit in 175L?
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Old 17th March 2006, 07:46 AM   #3
soongsc is online now soongsc  Taiwan
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I would expect somthing much lower than that in a corner.
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Old 17th March 2006, 11:23 AM   #4
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Smallish alternative: aperiodic. See the Omega speakers A8. Shouldn't be too difficult to clone. The dimensions are on the 6moons audio review of the speakers, you'll need 2 of those Scan-Speak aperiodic vents per enclosure. Add some damping to the magnet / basket, add some bracing, smere the internals with some form of damping compound, and you should be sorted. Won't go as low, obviously, but it should get down to the mid 40Hz regions, especially in a corner, and sound nicely damped, and still be an easy load. Just a thought.
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Old 17th March 2006, 01:05 PM   #5
jdybnis is offline jdybnis  United States
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Those A8's look good. The thing is that I'm pretty much tied to making corner speakers of roughly those dimensions. It seems like a waste not to use all the volume available. Sure I can put legs on a smaller speaker, or section off the interior, but it's not often I can find a place for a 175L enclosure.

I'm restricted because there are a couple of decorative tables in the corners where the speakers are going to go. I've got to replace them. That rules out the BIB or any other speaker over "decorative table height".

There are nothing but raves for the B200. I'd like to try them out. The BR design is sufficient, but GM's ML-TQWT is significantly better. It has a lower tuning frequency AND more output across the board. I just can't build something quite that big.
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Old 17th March 2006, 06:54 PM   #6
Corloc is offline Corloc  United States
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The B200 are great drivers. I thought the BIB was talking resently about the Pioneer B20. I will have to reread the thread.

O' food for thought, the B200 beams alot. In open baffle it has taken me a while to set up the sound stage correctly. It might suit you better to use the smaller A8 design, If your stuck putting the cabs in the corners.
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Old 17th March 2006, 10:15 PM   #7
TC is offline TC  United States
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Quote:
Hi I'm looking for an enclosure for the B200 that will work well in a corner. I'm considering a 175L bass reflex tuned to 40Hz.

This is my shop system. With a pioneer reciever, it does 40hhz louder than the whole 5000sqft machine room and loud enough to be clean with earmuffs on. I added a ratshack supertweeter. Amazing sound. It's the cornerloading.

TC
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Old 17th March 2006, 10:47 PM   #8
VadimB is offline VadimB  United States
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I would be affraid of a broad peak from 130 down to 40 Hz in your simulation. This driver has a very high Q, so it will be hard to get a tight bass in BR alignment.

Have you checked the kits, developed for this driver? Here is one interesting example:
http://www.e-speakers.com/catalog/solo_100_-_pair_4813471.htm
There are more on Klung & Tone (spelling?)

Actually, I'd love to see the day when smaller speakers would not be OK in my house and I'm asked to make them bigger.
How about making 75l aperiodic boxes for B200 and another pair of 100l subs with Linkwitz Transform and 12-15" woofers, crossed over at 40-50Hz? Tune them to Q=.5 and they will match widerangers in speed and tightness nicely.

Vadim
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Old 17th March 2006, 10:58 PM   #9
jdybnis is offline jdybnis  United States
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It's a go then on the BR. Now I'm really excited. Just a standard BR, or is there something special about the enclosure you're using? Port is front firing? Maybe I'll tune it 5Hz lower to get some extra protection on the low end. I don't think the whole house is 5000sqft
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Old 17th March 2006, 11:17 PM   #10
jdybnis is offline jdybnis  United States
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Quote:
Originally posted by VadimB
I would be affraid of a broad peak from 130 down to 40 Hz in your simulation. This driver has a very high Q, so it will be hard to get a tight bass in BR alignment.
Actually the high Q works out well with the high fs. If I add a couple ohms of series resistance the peak narrows. It is centered around fs (55Hz). It should give it some kick, rather than sounding mushy.

The more I play around with the sims the more I appreciate how carefully they designed this driver.
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