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393 Search Results Found |
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Forum: Speaker «»
Posted on: Mon, 18 July 2016 10:46 «»
By: Wayne Parham
Re: Mono "flanking sub"
Subwoofer cabinet shape isn't really important because the cabinet is acoustically small. Standing waves cannot setup inside.
Welti started off doing just position but later added equalization. Geddes proibably followed suit. It's an Nth degree thi...
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Forum: Pi Speakers «»
Posted on: Fri, 05 February 2016 14:51 «»
By: Wayne Parham
Re: I've always wondered about this
Some of the bass bins over the years were designed with the woofer placed physically lower. Most though, it has been placed in or near near the middle. Truth is, the bandwidth makes it not matter all that much, and the upper limit prevents internal st...
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Forum: Pi Speakers «»
Posted on: Tue, 07 July 2015 10:42 «»
By: Wayne Parham
Re: Barzilay 4pi
Sorry, I missed this earlier. The question was asked whether tuning at 38Hz should be modified and increased to 40Hz.
I designed the system for 38Hz tuning. But really, the difference in response that results from a Helmholtz frequency of 40Hz is so...
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Forum: Pi Speakers «»
Posted on: Wed, 10 December 2014 10:21 «»
By: Wayne Parham
Re: Two PI: A Little Bright OR Light in the Bass?
You're right. I was replying to the first post in the thread, not the most current one.
I'll respond to your more recent comments this time.
I like using blocks of wood built-up to make a port. Your 2" drill bit is fine. The small differenc...
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Forum: Speaker «»
Posted on: Tue, 07 October 2014 15:26 «»
By: Wayne Parham
Re: Best midbass horn and question about lobing
I would proffer two observations, one that you asked for and one that you didn't:
First, if the required SPL can be achieved with a single horn, I would always prefer one horn to two because of the interference that necessarily results. Of course, yo...
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Forum: Pi Speakers «»
Posted on: Sun, 14 September 2014 19:30 «»
By: Wayne Parham
Re: Two PI: A Little Bright OR Light in the Bass?
The problem with stretching the standard model to form a tower is that standing waves develop inside. Our tower was mathematically modeled to make sure neither the midwoofer nor the port are in a pressure node at lower midrange frequencies, which preven...
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Forum: Pi Speakers «»
Posted on: Fri, 18 July 2014 13:27 «»
By: Wayne Parham
Re: Alternatives to Martin King's spreadsheets
One thing you can do - and that makes the most sense to me - is to use one of the standard T/S modeling programs to get an idea what various alignments will do. Basically, just check the response at different box sizes. You'll see the larger the box, t...
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Forum: Pi Speakers «»
Posted on: Wed, 16 July 2014 11:22 «»
By: Wayne Parham
Re: Alternatives to Martin King's spreadsheets
When you tune a box to a certain frequency, you're setting Helmholtz (cavity) resonance using box and port size. In T/S simulations, this is known as fb.
Alternatively, one can use 1/4λ (pipe mode) standing wave resonance instead of Helmholtz resonan...
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Forum: Pi Speakers «»
Posted on: Wed, 16 July 2014 10:57 «»
By: Wayne Parham
Re: 2 PI - maximum volume to avoid Helmholtz standing waves
Man, I'd love to have the time to run simulations and fiddle around like I used to. But these days, I'm so backlogged I just can't. If I even said I'd get to it, might be the best of intentions, but I'd be lying. I'm just so slammed with projects, and...
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Forum: Pi Speakers «»
Posted on: Tue, 15 July 2014 23:45 «»
By: CRISTIAN M
Alternatives to Martin King's spreadsheets
Hello all,
Are there alternatives to Martin King's spreadsheets to evaluate port / driver location?
I've been dealing with a software called "bassbox" which is very useful, but it doesn't provide clues to minimize the effect of standing wav...
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