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| Re: 4PI Cabinet plans / question [message #73082 is a reply to message #73069] |
Thu, 21 June 2012 13:34   |
thatsnasty
Messages: 12
Registered: June 2012
Location: Niagara Falls
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Chancellor |
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| Wayne Parham wrote on Thu, 21 June 2012 09:32 | I've sent plans to your email address.
Kits include the binding post terminal, but crossovers by themselves do not. The one we ship in the kits need a 2-1/8" x 2-7/8" hole cutout.
The four π speaker and its crossover are specifically designed for the JBL 2226H. You'll want to buy our H290C waveguide, because the crossover was designed for that as well.
For a center channel, you can simply omit the port, if you wish. I would leave the left and right mains vented, as designed. Also use flanking subs to smooth room modes and the self-interference anomalies from floor bounce and the reflection off the wall behind the speakers.
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Thanks for the quick response!
Sealed center seems like a good idea then. It will keep the speakers looking "even" as opposed to offsetting the port either way in the center.
I asked about the terminals because it'll likely cost more for shipping 3 terminals to Canada from PE then it would to get them when I buy the x-overs. Is it possible that I can buy 3 from you, without the kit, and get them shipped with the x/o?
Thanks again, if anything else comes up that the search function cannot find, I'll be sure to bug you 
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| Re: 4PI Cabinet plans / question [message #74826 is a reply to message #73072] |
Sun, 09 December 2012 10:04 |
zheka
Messages: 80
Registered: June 2012
Location: Chicago burbs
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Viscount |
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| Wayne Parham wrote on Thu, 21 June 2012 11:07 |
I do not think it is valid to consider sealed mains to be easier to integrate with multisubs. In fact, I'd say this presumption goes against the whole multisub concept, which is to blend sound sources having various phase relationships and physical locations in the modal region.
The additional extension from vented mains helps increase overlap between mains and flanking subs. The venting also reduces excursion. It is a good thing, all the way around.
I'd rather the center be vented too, but I don't think we lose much to have one channel sealed. It has a different phase characteristic, but then again, being in a different location is sort of the same thing, and is even better. It's the various locations that matter the most.
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Is there any reason why the same logic cannot be extended to tapped horn subs? In other words, can THs be mixed with sealed and bass-reflex subs in multisub setups?
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