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View Full Version : Ported Box for 2 12" PowerBase Evo's



07BronzeFuz
07-10-2009, 05:44 PM
Guys I just got 2 of the older style Powerbase evo's. They have the blue cone and chrome baskets. I email powerbase and they recommend this

Optimum Ported Volume ES 12DS Standard Metric
Gross Vb Internal 2.1 cu.ft 59.47 Liters
Slot Port (W x H = Sq. In) 15 sq.in x 15 D 96.8sq.cm x 38.1cm D
Or Alternate Circular Port (2) 3 x 13 D (2) 7.6 cm x 33 cm D
Fb (Box Tuning) 36.45 Hz 36.45 Hz
F3 (-3dB Cutoff) 28.22 Hz 28.22 Hz
Pe (Watts-Rms) 400-800 Watts 400-800 Watts
Subsonic Filter Setting If Applicable 25-30 Hz 25-30 Hz

Small Ported Volume ES 12DS Standard Metric
Gross Vb Internal 1.6 cu.ft 45.3 Liters
Slot Port (W x H = Sq. In) n/a n/a
Or Alternate Circular Port 4 x 16 D 10.2 cm x 40.6 cm D
Fb (Box Tuning) 36.59 Hz 36.59 Hz
F3 (-3dB Cutoff) 33.92 Hz 33.92 Hz
Pe (Watts-Rms) 300-700 Watts 300-700 Watts
Subsonic Filter Setting If Applicable 20-25 Hz 20-25 Hz


Sealed is optimum sealed is 1.25 and large is 1.75. with 16 oz of polyfill.

I need help on placement of the woofers and port. I really want a slot port but may have to do it on the side. I have about 35" from side to side and maybe 17" in height. I'm not looking to fill the entire trunk up either with box. What should I do. Of course I want it to be loud as possible. I also have a 60/40 folding seats in the rear. I'm afraid a slot port will take up so much cu ft inside I might have to do PVC 4".