point source / omnipole idea... have some questions.

AudioGeek · 13th December 2006, 09:44 PM

ok,

here is my idea:

use 4 4"-6" drivers and one tweeter per channel.

each driver on each side of enclosure and tweeter on top panel.

for a 4" driver, what frequency should i start rolling off HF so that they act like a omnipole at all frequencies at say 5 feet away?

and the same ? for the 6" drivers.

i want to run them fullrange and just put a cap in series with tweeter for x-over.

so... will a 6" drivers on each side act like a omnipole at higher frequencies, or should i stick with the 4" drivers?

i hope you understand my question.

Thanks!

AudioGeek · 14th December 2006, 07:29 PM

no answers yet?

Geoff H · 14th December 2006, 10:39 PM

I think you need to look at a polar plot for the driver. 3db down at 45 deg off axis is where they will overlap. Above that F they will start to beam.

Rather than have a driver on the rear, I would place it on the top, or 2 on the front.

I tried an array of 4 4" DCs on an arc many moons ago. Spread the upper mids OK, but couldn't get the transient attack I wanted.

You may have to build a mule and try different combo's.

Geoff.

13th December 2006, 09:44 PM	#1
AudioGeek diyAudio Member Join Date: Jan 2004 Location: Minnesota	point source / omnipole idea... have some questions. ok, here is my idea: use 4 4"-6" drivers and one tweeter per channel. each driver on each side of enclosure and tweeter on top panel. for a 4" driver, what frequency should i start rolling off HF so that they act like a omnipole at all frequencies at say 5 feet away? and the same ? for the 6" drivers. i want to run them fullrange and just put a cap in series with tweeter for x-over. so... will a 6" drivers on each side act like a omnipole at higher frequencies, or should i stick with the 4" drivers? i hope you understand my question. Thanks! __________________ It is not you... you are it.

14th December 2006, 07:29 PM	#2
AudioGeek diyAudio Member Join Date: Jan 2004 Location: Minnesota	no answers yet? __________________ It is not you... you are it.

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14th December 2006, 10:39 PM	#3
Geoff H diyAudio Member Join Date: Oct 2006	I think you need to look at a polar plot for the driver. 3db down at 45 deg off axis is where they will overlap. Above that F they will start to beam. Rather than have a driver on the rear, I would place it on the top, or 2 on the front. I tried an array of 4 4" DCs on an arc many moons ago. Spread the upper mids OK, but couldn't get the transient attack I wanted. You may have to build a mule and try different combo's. Geoff.