sumsound wrote on Sat, 30 July 2005 18:28 |
Ohh for shure.
I'm kinda tripped out by the fact that my BT7's don't sound as loud at 30Hz if you're sitting right in front of them. But you really notice it the further you get away from them. From that article explaining "Long Throw Sub woofers" I wonder if the same will be true for a 4X12" Direct Radiator?
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Yes, it will. A 30 Hz wave is too long, and, you can't
isolate it in a smaller enviorment.
What you can do is use a lot of 4x12 Direct Radiators
that reads flat in normalized gain in Bass Box Pro.
How much you'll need will depend on how much you want
to excite the room.
But, bare in mind, frequencies that low will always
be per-dominant at a distance. And generally sounds
better.
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I have considered the Bandpass Box but the seem to rob you of sensitivity, so I sorta ruled them out.
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A Bandpass will give you what you want if the objective
is to get a peaky 30 Hertz. However, it will increase
the excursion, and, tax the driver a lot.
I think you need to get your hands on a Bandpass filter,
tune it to 30 Hertz, and, listen to various tracks.
You'll find that in order to achieve 30 Hertz at a sizable
level, you'll need 40, 50, & 60 Hertz as well.
This is where sinewaves can throw you off. For your sub
will sound fine playing a 30 Hertz sinewave, but, music
offers various sinwaves. And, you need the other frequencies
around 30 Hertz, to enhance 30 Hertz.
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I'm not sure about passive radiators. Group delay and Phase seem all wacky in the models I've done.
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Then you better go sealed, for all direct radiators offer
Group Delay, and, Phase Issues.
Best Regards,