Cabbing some Eminence Beta 15s [message #63923] |
Fri, 27 August 2010 20:34 |
JCDC
Messages: 43 Registered: August 2010
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Baron |
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Hey All,
I was using B15s for open baffle but now I want to throw them in cabs.
PiAlign comes with many files for the B15: B15, B15 in a pi system and B15 in Boxplot.
The up-to-date specs are:
Vad=11.8
Qd=1.72
Frd=35
Very close to the original:
Vad=11.3
Qd=1.8
Frd=36
PiAlign suggests:
Vol 6.9 cuft, Fr 22.5 and Q .97 (new specs)
Vol 6.3 cuft, Fr 24.3 and Q 1 (old specs)
Going with the new specs yields an aesthetically pleasing 2 x 3 x 1 1/3 ft, 7 cuft cab.
Boxplot shows a 2dB hump centered at 78Hz and an F3 of 44, an F10 of 28 and an F20 of 15. Not bad!
But that is a pretty big cab! Could I get away with a 5 cuft or even the 2.5 of a 4 pi?
In a 5 cuft cab with the same tuning, Boxplot shows a 2.5dB hump centered at 82Hz and an F3 of 48, an F10 of 33 and an F20 of 17.
The 2.5 cuft doesn't look good, with a 4dB hump centered at 97Hz and an F3 of 60, an F10 of 43 and an F20 of 25.
What I don't know about is how this affects impulse response?
What do you think? The 2.5 looks right out ... but how about the 5?
Thanks,
Jeff
PS PiAlign doesn't update the Encl Fr when I change port dimensions?
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Re: Cabbing some Eminence Beta 15s [message #63927 is a reply to message #63925] |
Sat, 28 August 2010 17:47 |
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Wayne Parham
Messages: 18787 Registered: January 2001
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Illuminati (33rd Degree) |
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Well, indoors, a 2dB hump in a cabinet is probabably not going to matter much, especially if there is plenty of output below it and with a slow rolloff slope. The larger low-end Eminence woofers all tend to do that in boxes smaller than a house.
I'd prefer the Omega 15 because it's a better woofer and can be used in a much smaller box. Of course, it's more expensive but the cost of wood for the larger box kind of makes up for that.
No matter how you slice it, the best thing to do is to add subs. That will smooth everything out. So in a sense, the thing you're looking for is really midbass and midrange quality.
But if you're looking for a budget build, the multisubs and more expensive midwoofers might be too much. In that case, the big box build will give you some deep bass, and if you're not using subs, that can be important.
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