Posted by Wayne Parham [ 68.91.12.154 ] on September 09, 2005 at 03:20:24:
In Reply to: Re: Eminence Beta12LTa -- best cabinet? posted by Sean on September 09, 2005 at 02:17:52:
You could do sealed, sure. The Beta 12LT works very well in a sealed box. But it provides deeper bass extension in a vented box of the same size. Compared with sealed cabinets, vented boxes reduce excursion between fb and fh, which is a large portion of the bass range. Excursion only increases below fl. See the posts called "Port vs Sealed" and "Resonance".
Sealed alignments
Cabinet size f3 f10 peaking (100Hz - 200Hz)
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1.5ft3 70Hz 50Hz +2dB
2.0ft3 70Hz 45Hz +1dB
3.0ft3 65Hz 40Hz
4.5ft3 65Hz 37Hz
6.5ft3 65Hz 35Hz
9.5ft3 65Hz 33Hz
Vented alignments (Helmholtz frequency = 35Hz)
Cabinet size f3 f10 peaking (100Hz - 200Hz)
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1.5ft3 70Hz 47Hz +2dB
2.0ft3 63Hz 40Hz +2dB
3.0ft3 55Hz 35Hz +1.5dB
4.5ft3 45Hz 28Hz +1dB
6.5ft3 38Hz 27Hz
9.5ft3 33Hz 27Hz
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