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Sometimes the majority only means that all the fools are on the same side.

Use your ears to judge components, NOT your wallet! K.I.S.S.

members.tripod.com/Audiophyle

Go search young man!

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Blow your mind - PORT your box!

I have built a few Aperodic membranes for comp. before. They are not hard to build or tune, but you must remember you will loose overall output to gain low hz extention. These systems sound really "DRY", or accurate.

I have had the best luck with building the mat on the back side of the sub, with a minimum of an enclosure. You must first treat the setup like a free air, and seal off the trunks airspace from the cars interior as possible.

The box will be just deep enough for the back not to hit the magnet. Once the box is built, except for the back. I cut the back wall out to expose as much air as I can and still be able to attach it to the box, leaving a lip to attach hard screen to the inside of the back wall. (I use nylon window screen, F-26 and wood strips, to reinfore the stapled screen to the box.) When mounted to the box should give you 3/4" deep opening the the back wall for mat placement. {3/4" depth is wood thickness.}

Now make two more back wall with the same cutouts as the first. one of these will be just for spacing and the other will be the actual box's rear. I router a grove the depth of the screen into the inside of one of the box backs, and staple in the screen. DO NOT ATTACH TO THE BOX!!! Then I use F-26 to glue/seal the two new backs together. Now you have a screened in space for the tuning mat to be installed.

The mat you use is YELLOW fiberglass insulation. Not PINK!!! pink is not uniformly dense!!!

With the box, subs and amp installed into the vehicle play a test tone through the subs at their "FS"(Low vol. just enough to hear). get your volt meter. place a 1K ohm resister in series with the + speaker lead.(when you do this the voltage measurement you are taking is a mirror image of the impedance.) Place the meter leads to read voltage on the speaker outputs. (one on + one on -) Tear off a piece of insulation to fit inside the opening you cut inside the back wall of the box. Install the insulation in the gap between the box and the new backs you made. screw the new backs to the box.(NOT PERMINATLY!) ease the trunk down while looking at the meter. remember the voltage reading. Add more insulation. Ease trunk down, take a new voltage reading. Keep repeting this till the voltage levels out. once this happens. Seal the new back to the box and complete the trim work. YOU ARE DONE TUNING!

I hope this helps...

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Sometimes the majority only means that all the fools are on the same side.

Use your ears to judge components, NOT your wallet! K.I.S.S.

members.tripod.com/Audiophyle