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495 Search Results Found |
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Forum: Speaker «»
Posted on: Wed, 27 April 2011 14:18 «»
By: Wayne Parham
Re: Room modes, multisubs and flanking subs
What sets the modal range apart from the reverberant range (also sometimes referred to as the statistical range) is the spacing between peaks and valleys. Up high, the interference is so dense it creates tightly spaced spikes. It looks like "grass...
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Forum: Pi Speakers «»
Posted on: Thu, 14 April 2011 21:47 «»
By: Wayne Parham
Re: In-wall baffle
Flush soffit mouting is a good thing because it eliminates the (baffle step) directivity transion from freespace to halfspace radiation. Anytime there is a directivity change, there is a corresponding change in on-axis response. This assumes power resp...
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Forum: Pi Speakers «»
Posted on: Thu, 14 April 2011 01:31 «»
By: Wayne Parham
Re: 3-Pi Speaker plans
Don't crossover, blend the mains with the subs. Low-pass the subs, but don't high-pass the mains. These speakers won't need the high-pass like you might do in a prosound environment. What you'll gain is better smoothing of room modes.
For more info...
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Forum: Speaker «»
Posted on: Tue, 05 April 2011 15:24 «»
By: Wayne Parham
Room modes, multisubs and flanking subs
When I first considered the multisub approach, it was prompted by papers written by Todd Welti. He did several tests that showed in-room amplitude response could be made smoother using multiple subs, and gave specific guidance about placement. His favo...
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Forum: Pi Speakers «»
Posted on: Thu, 31 March 2011 23:40 «»
By: Wayne Parham
Options in a nutshell
It's all about the midrange, when you're talking differences between the JBL 2226 and the Eminence Omega 15 in the four Pi loudspeaker. The Omega 15 sounds very good, powerful yet still natural sounding. But it isn't as good as the JBL woofer. The 222...
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Forum: Pi Speakers «»
Posted on: Sun, 27 March 2011 23:43 «»
By: Wayne Parham
Upgrades
Upgrades are worth their extra cost. I would upgrade in the following order, as I think these bring the greatest improvements in this order:
1. Woofer
2. Compression driver
3. Coils
4. Capacitors
5. Resistors
The upgraded woofer make a bi...
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Forum: Room Acoustics «»
Posted on: Sun, 27 February 2011 16:45 «»
By: Wayne Parham
Multisubs
Do a search for "multisub". The idea is to use multiple subs to smooth room modes, making the bass sound good throughout the room. That's the best way to setup subs, but it does require more than one.
If you have only one sub, it will soun...
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Forum: Pi Speakers «»
Posted on: Mon, 21 February 2011 19:07 «»
By: Wayne Parham
Re: 4 pi, oh my!
They're a very easy load for tube amps. High efficiency and benign impedance curve. Perfect for tubes.
They are intended to be built and used in mirror images. This is mostly for aesthetics but there is a very small oblique tilt in the position of ...
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Forum: Pi Speakers «»
Posted on: Sat, 05 February 2011 09:47 «»
By: Wayne Parham
Re: Jumping the gun, but a few questions
I don't suggest deviating from the plans unless you are prepared to do a lot of measurements and go through a full design/test cycle. Some modifications can be done with little impact but most can't. Making the cabinet significantly larger changes the ...
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Forum: Pi Speakers «»
Posted on: Wed, 02 February 2011 11:01 «»
By: Wayne Parham
Re: Multisubs
What I mean when I say "leave the mains wide open" is to not high-pass them, let them run all the way down.
As you've said, conventional wisdom is to high-pass the mains at the same frequency you low-pass the subs. This is a traditional cro...
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