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275 Search Results Found |
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Forum: Pi Speakers «»
Posted on: Tue, 15 July 2014 10:01 «»
By: Wayne Parham
Re: 2 PI - maximum volume to avoid Helmholtz standing waves
I can't say 'cause I haven't done that. On the little model, I'd be pretty comfortable that it wouldn't cause ill effects but I wouldn't be as confident on the larger tower model. The bigger boxes are where things get dicey, and you'd be surprised how ...
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Forum: Pi Speakers «»
Posted on: Mon, 14 July 2014 12:24 «»
By: CRISTIAN M
Re: 2 PI - maximum volume to avoid Helmholtz standing waves
Yes, I was looking for those spreadsheets a couple days ago, based on your suggestions to other users, but sadly they are not available anymore (it says "restricted access").
If I rotate the bookshelf version 90ยบ then I end up having 10 x 22 i...
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Forum: Pi Speakers «»
Posted on: Mon, 14 July 2014 12:06 «»
By: Wayne Parham
Re: 2 PI - maximum volume to avoid Helmholtz standing waves
I would suggest using Martin King's spreadsheets, if they're still available:
Quarter-Wave.com
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Forum: Pi Speakers «»
Posted on: Mon, 14 July 2014 12:03 «»
By: CRISTIAN M
Re: 2 PI - maximum volume to avoid Helmholtz standing waves
Thanks Wayne,
Which software do you recommend to run those models before being physically built? (hopefully something not very complicated).
I've checked this software:
1. BassBox Pro (same or very similar to the Eminence one)
2. WinISD
3. Pass...
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Forum: Pi Speakers «»
Posted on: Mon, 14 July 2014 10:00 «»
By: Wayne Parham
Re: 2 PI - maximum volume to avoid Helmholtz standing waves
The bookshelf version is small enough that standing waves are in the upper midrange where the insulation is pretty effective. They're damped very well. But larger boxes boxes (like the tower model) have standing waves in the lower midrange and upper mi...
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Forum: Pi Speakers «»
Posted on: Sat, 12 July 2014 21:20 «»
By: CRISTIAN M
2 PI - maximum volume to avoid Helmholtz standing waves
Hi Wayne,
I'm preparing myself to build a pair of 2PI to be used primarily as stereo speakers (not for home theater or anything like that), so they need to be as full range as possible.
BUT...Due to physical constraints in my living room I cannot use...
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Forum: Pi Speakers «»
Posted on: Mon, 17 February 2014 16:52 «»
By: Wayne Parham
Re: 3 PI build
There is a write-up about measuring T/S parameters in the link below:
T/S MeasurementsOf course, now days, with some of the automated measurement devices, you can literally get these specs with just a few clicks of the mouse and a test box or some weigh...
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Forum: Pi Speakers «»
Posted on: Fri, 07 February 2014 12:08 «»
By: Wayne Parham
Re: Speaker stuffing
You know, the virtual size increase is really a Helmholtz thing. It's measureable, and it happens, but I don't care about that part nearly as much as I do the internal standing waves. As long as the changes you made don't cause ripple in the upper midb...
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Forum: Pi Speakers «»
Posted on: Wed, 25 December 2013 01:35 «»
By: Wayne Parham
Re: 4pi Baffle length
Oil filled caps are great, but don't change the cabinet dimensions or the port. There's a lot of R&D invested in these, and if you modify them, you throw that investment out the window.
It's not so much the Helmholtz frequency I'm worried about, ...
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Forum: Pi Speakers «»
Posted on: Wed, 27 February 2013 17:25 «»
By: Wayne Parham
Re: Cabinet design, port placement and internal standing waves
He used to supply a spreadsheet for ported cabinets tuned primarily using Helmholtz resonance. While his main focus was transmission lines, he also had a spreadsheet that covered bass-reflex boxes at one time. I'm sure he still does, or perhaps he morp...
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