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144 Search Results Found |
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Forum: Pi Speakers «»
Posted on: Fri, 12 July 2024 15:15 «»
By: Wayne Parham
Re: Retrofitting Altec 612 cabinet for a 4pi build
I wouldn't change the dimensions of the cabinet for these reasons (from the Pi Speakers FAQ):
Cabinet design, port placement and internal standing waves
Damping material placement
Altering Dimensions
I realize you are talking about reducing the inter...
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Forum: Pi Speakers «»
Posted on: Sun, 05 November 2023 09:38 «»
By: Wayne Parham
Re: 4 Pi Build in San Luis Obispo - Progress
The cabinet is pretty simple - it's a rectangular box - so cabinetmakers don't need anything more to be able to cut and build from these plans. They're not like the 12Pi hornsubs, which really is a complicated build, and needs more detail in the drawing...
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Forum: Craftsmen «»
Posted on: Tue, 31 October 2023 08:58 «»
By: Wayne Parham
Re: Unique Speaker Shapes
Some loudspeakers are made in irregular shapes to breakup internal standing waves. I think that is a good idea, but I have found that through careful dimensions, damping material and driver locations, a "good old" rectangular cabinet can be ma...
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Forum: Pi Speakers «»
Posted on: Sun, 13 August 2023 08:21 «»
By: Wayne Parham
Re: 2 and 4 Pi
I've measured a few of Eminence's compression drivers made after the PSD2002. They are fine, but didn't push me towards offering them. You can try the ASD-1001B, but to do that you'll need to adjust the R1/R2 values to compensate for the reduced sensit...
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Forum: Pi Speakers «»
Posted on: Sun, 09 July 2023 10:01 «»
By: Wayne Parham
Re: 4-pi "clone", active - am I on the right track?
Those look cool!
Here are some things to consider, test and check:
Phase angles, crossovers and baffle spacing
Baffle spacing, phase angles and time alignment, revisited
Crossover optimization for DI-matched two-way speakers
Cabinet design, port p...
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Forum: Pi Speakers «»
Posted on: Sun, 04 June 2023 23:02 «»
By: Wayne Parham
Re: Jbl 2226h and 2447h
Yes, close, 38Hz actually. And the positions of the driver, port and internal damping material are also optimized to minimize the effects of internal standing waves.
In a cabinet this size, that's very important. It's arguably more important than th...
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Forum: Pi Speakers «»
Posted on: Thu, 06 April 2023 18:33 «»
By: Wayne Parham
Re: Am I in the Right Place?
Going a little larger - to 5ft3 - adds a smidge more bass and remains properly damped. You can model it and see what I mean, or build a physical model and measure it. Going smaller reduces bass output, but again, remains properly damped. So that's a u...
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Forum: Pi Speakers «»
Posted on: Fri, 17 March 2023 09:50 «»
By: Wayne Parham
Re: Pi3 vs Pi4
I think that will work but is there any reason you can't move the television console a little bit?
The three Pi subwoofer is a 20" cube, but you can modify dimensions slightly with no ill-effects. Don't make it too long though - we don't want st...
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Forum: Pi Speakers «»
Posted on: Fri, 24 February 2023 12:26 «»
By: Wayne Parham
Re: Subs for floorstander and corner horns
Yes, absolutely. Compensate for any displaced internal volume by "growing" the cabinet to make up for the difference.
In this case, internal standing waves aren't possible because cabinet dimensions are so much smaller than a wavelength thr...
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Forum: Pi Speakers «»
Posted on: Tue, 23 August 2022 09:09 «»
By: Wayne Parham
Re: My 3π adventure
I meant to add some comments about the Helmholtz frequency in each of my responses above, but forgot. It was more important to me to discuss the use of flanking subs and multisubs, and the reasons for needing them. So I became involved in those respons...
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