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speaker plans 4 pi [message #96611] Sat, 08 April 2023 11:41 Go to next message
pda2000 is currently offline  pda2000
Messages: 1
Registered: April 2023
Esquire
Hi Wayne!
Thanks for your hard work and generosity.
Could I please get a set of 4 pi plans?
Thanks,
Jim Nash
Re: speaker plans 4 pi [message #96612 is a reply to message #96611] Sat, 08 April 2023 12:56 Go to previous messageGo to next message
Wayne Parham is currently offline  Wayne Parham
Messages: 18648
Registered: January 2001
Illuminati (33rd Degree)

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Re: speaker plans 4 pi [message #96722 is a reply to message #96611] Thu, 25 May 2023 22:56 Go to previous messageGo to next message
Vistacrusin is currently offline  Vistacrusin
Messages: 3
Registered: May 2023
Esquire
Hi Wayne,

Been reading through a bunch of posts and a couple of your papers

Could you send me the 4 pi plans please

Does that include the crossover information? Values, layout, recommended models

I found some JBL of the 2226 HPL 8 ohm local that I'm waiting to pull the trigger on prior to going through the plans.

B&C DE250 comes in Polyimide or Titanium. Is the Polyimide the correct driver for this application?

Thank you
Re: speaker plans 4 pi [message #96724 is a reply to message #96722] Thu, 25 May 2023 23:59 Go to previous messageGo to next message
Wayne Parham is currently offline  Wayne Parham
Messages: 18648
Registered: January 2001
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And - yes - the polyimide version of the DE250 is the one you want.

By the way, look into the concept of flanking subs too. If you don't use a pair right away, maybe save that for an upgrade project later.
Re: speaker plans 4 pi [message #96725 is a reply to message #96724] Fri, 26 May 2023 00:13 Go to previous messageGo to next message
Vistacrusin is currently offline  Vistacrusin
Messages: 3
Registered: May 2023
Esquire
Doesn't appear you private message went through.
Re: speaker plans 4 pi [message #96726 is a reply to message #96725] Fri, 26 May 2023 00:43 Go to previous messageGo to next message
Wayne Parham is currently offline  Wayne Parham
Messages: 18648
Registered: January 2001
Illuminati (33rd Degree)

Plans went to your Gmail address.
Re: speaker plans 4 pi [message #96789 is a reply to message #96611] Fri, 09 June 2023 20:26 Go to previous messageGo to next message
Vistacrusin is currently offline  Vistacrusin
Messages: 3
Registered: May 2023
Esquire
I acquired two full 4 pi kits from someone going a different direction. All products new with premium built crossovers

I sourced two JBL 2226 hpl woofers from a local used music instrument store.

I need to start sourcing parts to make a 3rd for the center channel. I've seen the posts to remove the port and to center the horn. Is this still correct, or should the port be moved somewhere else?

Is there any changes to the crossover that needs to happen? I couldn't find anything in the FAQ.

Is there a preferred method of raising the speakers. I have access to some large beams and could do solid wood risers. Or something different?

Thanks.
Re: speaker plans 4 pi [message #96790 is a reply to message #96789] Fri, 09 June 2023 22:57 Go to previous messageGo to next message
Wayne Parham is currently offline  Wayne Parham
Messages: 18648
Registered: January 2001
Illuminati (33rd Degree)

That's awesome! Hope it was a good deal for both you and the seller.

The deal with the center channel is the port can be removed for aesthetics. There isn't a benefit when doing so, in fact, there's a slight penalty. But only slight. The spectral match is still very good from 200Hz up, and below that you're in the modal range anyway. So it's not bad, and it looks better if the left and right speakers are made in mirror images - each with the tweeter towards the outside. The center speaker can have the tweeter centered when the port is removed.

Best to have the mains 12" to 15" up off the floor, with flanking subs placed slightly behind and beside the mains, sitting on the floor so slightly below the mains too. Left main has a left flanking sub and right has a right sub. Each is passed a (100Hz second-order) low-passed copy of the signal sent to the main it is flanking. This approach mitigates SBIR and higher-frequency room modes and also compensates for baffle step while providing increased bass extension.
Re: speaker plans 4 pi [message #96814 is a reply to message #96790] Sat, 01 July 2023 09:32 Go to previous messageGo to next message
Greg. is currently offline  Greg.
Messages: 1
Registered: July 2023
Esquire
Hi Wayne,

I've finally managed to pick up the drivers (JBL + B&C) for a pair of 4 pi as well!

Thanks for supplying the waveguides. Could you please send me a copy of the plans.

I appreciate the work you've put into this and I'm looking forward to the build.
Re: speaker plans 4 pi [message #96816 is a reply to message #96814] Sat, 01 July 2023 12:05 Go to previous messageGo to previous message
Wayne Parham is currently offline  Wayne Parham
Messages: 18648
Registered: January 2001
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