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help tuning push-push ApexJr super 8 woofer
help tuning push-push ApexJr super 8 woofer
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Old 27th September 2005, 09:56 AM   #21
planet10 is online now planet10  Canada
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help tuning push-push ApexJr super 8 woofer
Originally posted by jdybnis
What kind of cross brace did you use between the two drivers? I'm thinking of epoxying a few hardwood dowels between the backs of the drivers.
The structural brace between all the side walls was notched so that the magnets butted up against it.

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Old 27th September 2005, 02:24 PM   #22
jdybnis is offline jdybnis  United States
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I'll give that a shot before I start messing with epoxying the drivers.
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Old 28th September 2005, 04:00 AM   #23
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Just plugging the numbers into the ML-TQWT WS I get a T/S max flat with some peaking at Fb and another program calc's a bit high vent mach, so the need to 'stick a sock in it' is understandable.

FWIW, last year I took a look at this driver for someone and came up with this T/S max flat Voigt style dual driver pipe, but if they built it I never heard back, so as always YMMV:

L = 54"
SO = 1.122"^2 (physically comes to a point)
SL = 130.452"^2
rp = 2.121" (for simmimg purposes, build using dual 3" dia.)
Lp = 13"
drivers down 35.38"

It sims somewhat better damped for its much greater Vb than the BR of course, but like any max flat alignment it may sound a bit 'one note' in-room with this low an Fb, so I recommend bottom firing and possibly some vent damping for it also if near a wall or corner.

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