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Old 06-22-2014, 11:29 AM
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Default Convert 4th to a 6th. opinions?

Built the 4th for my tantric md15's and they just dont grab the lows that my 2-10s in a 6th did. Here's my thoughts.
Add a series port from the sealed to the ported chamber by adding a section to the rear of the enclosure (blo-thru truck box). Seems easy enough to do.

Here's a few pics



see the added portion at the rear? its a 12x3 port yielding a 9.1sqin per cuft port area for the 30Hz chamber. I know it's a bit small volume for 2 15's per side, but I'm gonna try it. Easy to put back to a 4th if I dont like it.

Front port is 28x9 which is 19sqin per cuft volume
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Old 06-22-2014, 08:05 PM
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no comments?
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Old 06-22-2014, 08:23 PM
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Rear chamber should be close to optimal ported airspace. It still won't bring out the bottom end. It may get a little louder, but it's the volume of space that allows the bottom end to come through
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Old 06-23-2014, 09:34 AM
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i wonder if you could grow the rear chamber box a bit larger to bring up the "sealed" side of the 4th to optimal size for ported for your subs.... then port in to the common chamber.

right now it might just act like a ported box that is a tad on the small side for those subs ?

either way i say try it - if its not what your after - then you can easily put it back to how it was before ya kno ?
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Old 06-23-2014, 09:59 AM
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you're going the wrong way with it. that 6th will be more of a flop than the 4th is.

rework the baffles so the subs fire forward and change to 8 4" ports and 50-60hz tuning{depending on the final numbers}
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