| Re: 7pi plan and guidance request [message #87184 is a reply to message #87182] |
Thu, 01 February 2018 09:44   |
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Wayne Parham
Messages: 18691
Registered: January 2001
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Illuminati (33rd Degree) |
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If you have the right corners, I would suggest using the 2226 drivers in seven π constant directivity cornerhorns and make subwoofers from the 2242 drivers. Put the subs in opposite corners or somewhere distant from the cornerhorns, in a multisub configuration. This will smooth low-frequency room modes. If the subs will be in corners, then put them in seven π-18 cabinets. If not, then put them in an 8ft3 box tuned to 30Hz.
If you don't have corners suitable for constant directivity cornerhorns, then make four π mains for the 2226 drivers and flank the mains with helper woofers using 2226 drivers. This "flanking sub" configuration helps mitigate self-interference from nearest boundaries, especially the wall behind the speakers. Constant directivity cornerhorns don't suffer from near-boundary reflections because they are acoustically close. But if you can't use seven π cornerhorns because the room layout doesn't allow, then use four π mains on 12" stands and flanking subs beside them.
In this case, each flanking sub (helper woofer) would actually be another four π cabinet sans tweeter, and it would sit beside, behind and below the main speaker. This has it offset a few feet in all three dimensions. Low-pass the helper woofer at 90Hz second-order. As described above, I'd suggest the 2242 woofers be used as distributed multisubs, with the low-pass set to around 80Hz fourth-order.
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