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1 Forum: Pi Speakers «» Posted on: Mon, 29 July 2013 12:22 «» By: Wayne Parham
Re: Compression Drivers
Update: Earlier in this thread, there was some discussion about a supposed change in the B&C DE250 driver. I attributed it to unit-to-unit variations and sensitivity of some crossover topologies to driver parameter shifts. Some had noticed Ear...
2 Forum: Pi Speakers «» Posted on: Fri, 19 July 2013 12:12 «» By: Wayne Parham
Re: 4Pi crossover study
I think it is smart to tackle one issue at a time. The way you're going about it is good. It's just that I also think if you get the response right for the SEOS, it won't be right for the H290C and vice versa. The biggest difference is the ripple, but...
3 Forum: Pi Speakers «» Posted on: Thu, 18 July 2013 22:18 «» By: Wayne Parham
Re: 4Pi crossover study
The π crossover will not work very well on the SEOS12 because SEOS horns have too much ripple. Designers using this horn usually incorporate notch filters to get decent response. To me, this is a deal breaker. That's why I did not adopt that horn in m...
4 Forum: Pi Speakers «» Posted on: Sun, 23 June 2013 16:33 «» By: Wayne Parham
Re: Helper Woofer Location
It's hard to say if that will be too low or not. It always seems to me the most realistic impression is created when the speakers are generally the same height as the screen. Sometimes, if the screen is a little above the listeners, the speakers do...
5 Forum: Pi Speakers «» Posted on: Sun, 23 June 2013 10:10 «» By: Wayne Parham
Re: Helper Woofer Location
As with all things, you can only make generalizations without testing. I found that doghouse shape empirically when I developed the first constant directivity cornerhorns. I also tested various compression ratios. The end result is the constant direct...
6 Forum: Pi Speakers «» Posted on: Sat, 22 June 2013 12:23 «» By: dheflin44
Re: Helper Woofer Location
Unfortunately, I don't have anything to try it with yet. In fact I just sent you a PM for more parts. I'm just doing some planning and looking ahead. I can't pull the 4PIs inboard at all without blocking the screen. I just wanted to see how big a deal...
7 Forum: Pi Speakers «» Posted on: Sat, 22 June 2013 11:55 «» By: Wayne Parham
Re: Helper Woofer Location
If you can put the speakers in the corners, you really want to run seven π cornerhorns instead. They are designed for corner placement, keeping the sound source acoustically close to the apex of the corner. That removes the need for flanking subs becau...
8 Forum: Pi Speakers «» Posted on: Wed, 12 June 2013 10:16 «» By: Wayne Parham
Re: Uniform Directivity - How important is it?
Based on my observations over the years, I have made three basic assumptions that largely drive my design choices: My first working assumption is that speakers with constant beamwidth always sound better than speakers that don't, provided everything e...
9 Forum: Pi Speakers «» Posted on: Mon, 10 June 2013 17:55 «» By: Wayne Parham
Re: Pete's Home Theater Build
You're right that the benefits from the JBL driver are much more pronounced in the four π speaker than they are in the seven π cornerhorn. The woofer is low-passed at 250Hz in the cornerhorn, so much of the gain from the flux stabilization ring is unu...
10 Forum: Pi Speakers «» Posted on: Fri, 07 June 2013 15:04 «» By: Wayne Parham
Re: Pete's Home Theater Build
That's an excellent question, one that has been posed here many times. I think that the method you propose will work well, and there are plenty that have done it that way. In fact, if I did not have experience with the sound of a three or four π center...
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