| |
93 Search Results Found |
| 1 |
Forum: Pi Speakers «»
Posted on: Fri, 05 October 2012 16:46 «»
By: Wayne Parham
Re: Suggestions for FAQ
There is a way to make threads sticky, yes. And sometimes I think about doing it. But really, there are probably a couple dozen that I refer to over and over again, and if I made them all sticky, the whole first page would be covered with them. Mayb...
|
| 2 |
Forum: Pi Speakers «»
Posted on: Wed, 03 October 2012 13:14 «»
By: Wayne Parham
Re: 4 PI by Andy
I'm not able to see some of your pictures. Looks like they're uploaded to a private area on the internet somewhere that you can see (probably because you're logged in) but the rest of us cannot see. I suggest uploading them as an attachment here, to ma...
|
| 3 |
Forum: Pi Speakers «»
Posted on: Thu, 20 September 2012 16:40 «»
By: rkeman
Six Pi Review
Corners can be the undoing of a loudspeaker. Bass becomes exaggerated. Close proximity to the walls results in early reflections that make imaging vague and the highs grainy. Most manufacturers recommend placing loudspeakers well away from corners and the ...
|
| 4 |
Forum: Pi Speakers «»
Posted on: Fri, 31 August 2012 18:28 «»
By: Wayne Parham
Cabinet design, port placement and internal standing waves
There are three things that come into play with the cabinet geometry and the arrangement of the woofer and port(s).
First is the Helmholtz frequency, which is something pretty much all DIYers think about. When you run a T/S simulation, this is primar...
|
| 5 |
Forum: Pi Speakers «»
Posted on: Thu, 17 May 2012 17:05 «»
By: Wayne Parham
Re: H290C Horn/Waveguide
Yes, the H290 horns in existing designs can be retrofitted with H290C waveguides. It was designed specifically to be a bolt-on upgrade.
The old H290 was really pretty good, acting much the same as a waveguide providing nearly constant horizontal dire...
|
| 6 |
Forum: Pi Speakers «»
Posted on: Tue, 27 March 2012 07:55 «»
By: Wayne Parham
Re: H290C Horn/Waveguide
There is no suitable alternative to the H290, now designated H290C. The horn/waveguide properties are very specific, and it cannot be substituted without a complete redesign/test cycle. The biggest issue is the position of the acoustic center, which is...
|
| 7 |
Forum: Pi Speakers «»
Posted on: Mon, 26 March 2012 10:09 «»
By: Wayne Parham
Re: Where's the Voice Coil?
Measurements at a large distance make small shifts in acoustic center have less effect on SPL, but they don't change the effects on phase. If you have two sound sources that are a half-wavelength apart, you'll still have cancellation, no matter what dis...
|
| 8 |
Forum: Pi Speakers «»
Posted on: Mon, 26 March 2012 08:28 «»
By: Bill Epstein
Re: Where's the Voice Coil?
Measuring at greater distances to lessen the effect of the acoustic center seems to imply that by the time the wavefronts reach the listening position time delay of the drivers becomes moot?
Couldn't hurt to try and line up the voice coils, tho'?
|
| 9 |
Forum: Pi Speakers «»
Posted on: Mon, 26 March 2012 08:03 «»
By: Wayne Parham
Re: Where's the Voice Coil?
The voice coil is centered just behind the front plate. That's the physical center, but the acoustic center depends on a lot of stuff. So if that's what you're really wanting to know, you gotta measure it. But you can estimate it as being just behind ...
|
| 10 |
Forum: Pi Speakers «»
Posted on: Fri, 16 March 2012 09:53 «»
By: Wayne Parham
Re: Let's talk about 4Pi Speaker Stands =p
I like using stands that are 12" to 15" tall, and have 3°-7° tilt. The reason is this puts the acoustic center at ear height, and maintains a nice forward lobe that is centered. A very important secondary reason is the angle helps to cradle t...
|
Posting Rules
Members
Search
Help
Register
Login
Get a T-Shirt!
