| Re: 4PI Cabinet plans / question [message #75036 is a reply to message #75035] |
Sat, 22 December 2012 09:46   |
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Wayne Parham
Messages: 18787
Registered: January 2001
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Illuminati (33rd Degree) |
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| thatsnasty wrote on Sat, 22 December 2012 02:39 | I have my 4Pi's built and they sound fantastic!
The center is sealed as I was talking about above, but I had a question.
I'm currently crossing over the center at 80hz and the L/R at 50hz. I originally had the center at 50hz as well, but during more bass heavy content, I saw it was seeing some pretty decent excursion.
I was wondering if you had an idea how much power the 2226H can take with a 50hz cross in a sealed box?
My receiver (pioneer vsx-1018) will put out around 100-150w at max so just making sure I don't blow the thing up, lol.
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That's one of the main reasons I prefer vented boxes. They reduce excursion while at the same time adding extension. And in the modal region, the changing phase of a Helmholtz resonator is unimportant, so it's definitely better to run vented mains.
Still, the center channel looks nicer sealed, and I think your solution is a good one. They just can't take quite as much power, but they can be high passed a little higher for protction, as you've done. When high-passing the mains, do it as low as you can to increase overlap/blending so the room modes are mitigated as much as possible with multiple sound sources. The high-pass numbers you've chosen are just about perfect.
Here are some response and excursion charts, for comparison:
Response of four π loudspeaker
Woofer excursion on standard four π loudspeaker
Response of four π with port removed to make a sealed system
Woofer excursion on sealed four π |
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