I bought 4 of Apex jr's 6" Cerwin Vega speakers to build a set of M T M's. I was using Win ISD to design a box for them and I have been coming up with a really large enclosure design. It's calculating almost 10 cubic feet! I guess maybe I need some help using WinISD.
The only spec he has not provided is XMass so I just left it out. WinISD still calculated without it. Is that a critical measurment for this software to work?
Here are the specs he gives.
Cerwin-Vega 6" 16 ohm woofer good for MTM system $5.00ea.
Fs 58.48, Vas 20.05 l, Qts 0.8872, Qes 1.1012, Qms 4.5655, Re 14.88 ohms, Rm 0.739 ohms, Le 0.2540 mH, Spl 87.45 dB @ 1W/1M, cone area 0.0133m^2
Any help with a design would be appriciated. At $5 each I just coulden't resist. Maybe it was a bad choice of driver.
Xmax only represents the ability of the driver to have wide displacement, but it isn't needed.
I agree 10ft3 is a very big enclosure for small drivers.
Have you any simulated response to post ?
simulated response? You mean via WinISD?
WinISD is giving you accurate enough numbers, with the large size due primarily to the high Qts, which BTW is too high for a standard vented design, making either sealed, aperiodic, or OB the obvious choices for a MTM, though you could do them as isobaric to reduce the cab size for a TM.
Anyway, since they will need a sub regardless, ~aperiodic would be my choice to get a good blend to it around 80 Hz and keep the cab size reasonable, so I recommend a MTM TL.
Yes, simulated response through WinISD.
I agree, this driver has a high Qts rather adapted to a sealed enclosure.
If you want them to operate fullrange, maybe this driver isn't the most adapted.
Try simulating a transmission line using Martin's worksheets
Various Transmission Line contours (TQWT, TL, straight pipe...) can fit the widest range of driver possible I think, so it may be worth a try !
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