7pi plan and guidance request [message #87182] |
Wed, 31 January 2018 17:52 ![Go to next message Go to next message](/forum/theme/AudioRoundTable/images/down.png) |
w.bartek
Messages: 2 Registered: September 2017
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Esquire |
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Hi all -
I was able to get a handful of JBL 2226 and 2242 a while back. When trying to decide how I wanted to use them I found pi speakers. I think I want to do a 7pi build but am not sure which drivers I should use. They will be used mostly for cinema type content but would also be used for music. Does one play louder than the other? How is the low extension when using the 2242 compared to the 2226? Has anyone tried using two 2226: possible having the second cabinet hung from the ceiling?
Looking forward to your feedback.
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Re: 7pi plan and guidance request [message #87184 is a reply to message #87182] |
Thu, 01 February 2018 09:44 ![Go to previous message Go to previous message](/forum/theme/AudioRoundTable/images/up.png) ![Go to next message Go to next message](/forum/theme/AudioRoundTable/images/down.png) |
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Wayne Parham
Messages: 18752 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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