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Old 25th November 2012, 05:34 PM   #1
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Default Betsy K options

I've been looking at cabinet options for my Betsy K drivers and can't seem to get my head around 4-8 cubic foot MLTL's! I think I would like to try sealed boxes for these and wondered if anyone could share similar experiences with this option.

Larry
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Old 26th November 2012, 02:56 PM   #2
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Driver specs dictate optimal cab size for a given tuning, so any reduction reduces its low end response. Reduce it too much and and you wind up with a boom-box if you don't allow the back pressure to dissipate, which of course allows the bass response to bleed away also.

Sealed will have no bass to speak of except possibly via true corner loading, but few folks like the sound of a 'FR' driver stuck down at the floor in the corner, so up at the ceiling is the usual choice.

The Betsy's specs are better suited for sealed alignments, but to get an extended bass response requires an even bigger cab than vented, but does go lower, so combined with a bit of room gain it's a better choice overall since it can do organ symphonies, movie soundtracks at least at modest SPLs without needing EQ to protect it.

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Old 26th November 2012, 02:56 PM   #3
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Based on measured T/S params from my pair of BetsyK, 54 liters net, F3/F10 76 / 43 Hz. Won't take much power (<5 w) before over excursion.

They really don't want to be sealed. You vary size over a wide range and not change the response very much.

Note that these results are modeled. Haven't been built (and won't be).

They actually look prety good in 76 liters net, tuned to 44.5 (F3/F10 = 44/34) . There will be some quarter wave effects that haven't been accounted in these simulations.

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Originally Posted by larryldspkr View Post
I've been looking at cabinet options for my Betsy K drivers and can't seem to get my head around 4-8 cubic foot MLTL's! I think I would like to try sealed boxes for these and wondered if anyone could share similar experiences with this option.

Larry
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Last edited by fastbike1; 26th November 2012 at 02:59 PM.
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Old 26th November 2012, 11:24 PM   #4
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Thanks, I guess I already knew the answers to my questions, but was in a state of denial! lol Now all I have to do is build a suitable cabinet that "looks" smaller than it is! I will let you know how that turns out.

Larry
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