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High Efficiency Speaker Asylum Need speakers that can rock with just one watt? You found da place. |
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High Efficiency Speaker Asylum Need speakers that can rock with just one watt? You found da place. |
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In Reply to: Re: Unity vs Uno---Other John's Unity Version posted by Tim Moorman on December 8, 2002 at 15:49:10:
Hi Tim,"Question: Below what point is directionality lost?"
A wave guide with mouth width X (in) and coverage angle theta will maintain directional control down to a frequency of 10^6/(theta*X). Source "The Manta Ray Horns", Henricksen and Ureda, AES Loudspeaker Anothology v. 2, credited to Don Keele
So for 50Hz and a 60 degree coverage angle, you would need a horn mouth around 30 feet wide.
"I guess I was still operating under the mistaken impression that below 100 Hz and without significant upper harmonics, we were hard pressed to identify a source."
That is precisely the problem, it is more difficult for the brain to localize low frequency sources, especially when they come from the medial plane--in front, behind, above or below. When the brain cannot localize the source, it sounds like it is coming from inside your head. A feeling I personally can't stand. Pay attention next time you're listening and you'll know what I mean. The solution to this problem is to increase the lateral arriving energy relative to the medial arriving energy in the bass region. This can be done by increasing the directivity of your bass speakers and locating them at the sides of the room. You can also decrease the amount of bass reverberation in the room by a) adding more absorption--not very effective in the bass region or b) get a bigger room--somewhat expensive. Another trick that Dave Griesinger uses is to put in a 90 degree delay on one of the woofers below around 100Hz (you'll need to also add a 3dB boost of you do this). The end result if you do all this is that your brain still won't be able to localize the bass, but it will recognize that it is not coming from inside your head. In my room, I find that just going to dipoles is enough to get the bass out of my head. In addition, the directivity of a dipole woofer is a much better match to a horn mid and treble than for a monopole. I found when I had monopole woofers that if I equalized the on axis response, then the bass sounded boomy. If I equalized the power response, the bass lacked dynamics. The dipoles sound dynamic, but not boomy.
"Wacky subs are fun! It's just wood and wire for most of us--nothing too exotic."
The wackier the better in my book. I've got a bad case of sawdust lungs at the moment and I'm loving it.
John
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Follow Ups
- Re: Unity vs Uno---Other John's Unity Version - hancock 09:11:42 12/11/02 (1)
- Re: Unity vs Uno---Other John's Unity Version - str8aro 09:28:02 12/11/02 (0)
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