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275 Search Results Found |
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Forum: Speaker «»
Posted on: Sun, 19 December 2010 10:09 «»
By: Wayne Parham
"Vented Speaker Systems"
That's a tuning port. The box becomes a Helmholtz resonator. This is often called a called bass-reflex cabinet.
Suggested reading:"Vented speaker systems", Brian Davies, Electronics Australia (1981 Aug/Sep)
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Forum: Pi Speakers «»
Posted on: Wed, 08 December 2010 09:38 «»
By: Wayne Parham
Re: A question of wood thickness
MDF is wonderful material for these speakers. Since the port length of the two π tower is set by its rear panel thickness, the Helmholtz frequency is a function of the thickness of the wood. Here are some recommended hole sizes for various panel thickn...
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Forum: Pi Speakers «»
Posted on: Wed, 13 October 2010 13:09 «»
By: Wayne Parham
Dealing with internal standing waves
It's hard to say, really. The port is 10" long, so you'll have to bend it if you make the box any shallower than it already is. But that's OK, just make the port like the seven π cabinet. Beyond that, built it, test it and see.
My suggestion i...
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Forum: Pi Speakers «»
Posted on: Fri, 27 August 2010 21:33 «»
By: Wayne Parham
Re: Cabbing some Eminence Beta 15s
PiAlign choses a cabinet and tuning, and doesn't allow you to change that recommendation. There is a little Helmholtz calculator (below) I always used way back when if I wanted to find the box frequency of a given cabinet volume and port. Now days you ...
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Forum: Pi Speakers «»
Posted on: Fri, 27 August 2010 14:49 «»
By: Wayne Parham
Re: Two PI-tower WAF compromise
You can make a box between about 1.5ft3 and 5.5ft3 tuned to 40Hz and make the Alpha 10 happy.
The thing with the larger boxes is the possibility of internal standing waves lining up in a deleterious manner. What you don't want is a pressure node lini...
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Forum: Pro Sound «»
Posted on: Fri, 20 August 2010 13:20 «»
By: Wayne Parham
Re: Advice building bass cab
Vtotal is based on outside dimensions and Vb is interior dimensions minus offset from driver displacement.
I generally use a Helmholtz calculator to determine the port frequency and then calculate internal standing waves based on distances to boundari...
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Forum: Pi Speakers «»
Posted on: Sun, 30 May 2010 22:03 «»
By: grindstone
Re: 2 pi tower variants
Well, at my skill level, I'm counting the first two honks and not going high-order.
I mean, to state the obvious, making the volume into anything other than what you designed makes it something else so the question is what makes sense (no answer here,...
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Forum: Pi Speakers «»
Posted on: Sun, 30 May 2010 15:13 «»
By: Wayne Parham
Re: 2 pi tower variants
I'll send you the plans for the towers, some additional thoughts below.
First, the two π tower isn't a transmission line or horn, so folding it is sort of non sequitur. Its tuning mechanism is Helmholtz, so the shape doesn't matter... with the follow...
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Forum: Pi Speakers «»
Posted on: Wed, 05 May 2010 09:28 «»
By: Wayne Parham
Hornsubs verses direct radiators
I love horns, as you may know. And I think basshorns are some of the most challenging and exciting to build. The problem is, they have to be large to be good. That makes them difficult to use in a home hifi environment. Maybe in a batchelor pad or ma...
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Forum: Pi Speakers «»
Posted on: Mon, 12 April 2010 12:44 «»
By: Wayne Parham
Re: 3pi/ 4pi plans
There is probably no problem with those dimensions, but you could only really know for sure if you measured a speaker made that way. It's pretty close to a stock build though, so I'd be optimistic, kind of surprised to find any surprises.
You know...
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