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811b's and PSD2002 in 4pi Theatre [message #50220] Sat, 04 November 2006 22:19 Go to next message
Paul C. is currently offline  Paul C.
Messages: 218
Registered: May 2009
Master
As you know Wayne, I have purchased some Altec 811b horns for the 4pi Theatres I am building. In searching through the Pi Forum archives I found where you had posted this:

"The PSD2002 sounds excellent on the Altec 811 with the same crossover used in the Theater four π speaker. You can really consider the whole kit to be a good second source to Altec components for the Model 19 loudspeaker, but swap the polarity of the HF driver."

Why the polarity swap?


Re: 811b's and PSD2002 in 4pi Theatre [message #50221 is a reply to message #50220] Sat, 04 November 2006 23:34 Go to previous messageGo to next message
Cuppa Joe is currently offline  Cuppa Joe
Messages: 103
Registered: May 2009
Viscount
Hey, Paul! How's life & business?

Re: 811b's and PSD2002 in 4pi Theatre [message #50223 is a reply to message #50220] Sun, 05 November 2006 10:38 Go to previous messageGo to next message
Wayne Parham is currently offline  Wayne Parham
Messages: 18783
Registered: January 2001
Illuminati (33rd Degree)

The 811 is a longer horn and it moves the driver into a position where there is destructive interference in the crossover range. By swapping polarity, you can maintain acceptable summing.


Re: 811b's and PSD2002 in 4pi Theatre [message #50224 is a reply to message #50223] Sun, 05 November 2006 11:32 Go to previous messageGo to next message
Paul C. is currently offline  Paul C.
Messages: 218
Registered: May 2009
Master
Ahh, that's what I thought, wanted to make sure.

Thanks, Wayne!

Re: 811b's and PSD2002 in 4pi Theatre [message #50225 is a reply to message #50221] Sun, 05 November 2006 11:33 Go to previous message
Paul C. is currently offline  Paul C.
Messages: 218
Registered: May 2009
Master
Staying busy! As usual.

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