BKOLFO4

Adding 1-3" in that port setup is not going to make a noticable difference. And as already stated, you need to keep the 4" to the back of the box. Plug one of the ports and see what you think about the sound at a moderate volume. If you like it, you may have to rebuild the box, or add port length with the ports extended outside of the box. Brian

I run mine on 4000+ each without any problems. Just did a pair of them on a sound stream XXX-10000D and they will take more, no problem. 2.7 should not hurt, but 40 Hz tuning is a little high unless you have a subsonic filter and it is set correctly. Brian

2.7 for both, or each? sealed or ported? Gain setting is not a volume control. . .you could easily be getting full power out of that amp even at that setting. . .depends on your preout voltage.

Do you have a pair of calipers? You could measure the gap and then Fi can tell you what they can do for you. . .

If the amp really does 1400 RMS, I would do a pair of 18's if you have the room. If not, I would do a pair of 15's. Do you already have one of the 18's? If so, what coils did you order? What are the maximum dimension of the area you have?

I already have 4 of my Mayhems sold (pending payment). Waiting patiently. . .

I just tried it with an 18" BTL order. As far as Fi, Hardcore Customs is an AA dealer. . .I talk to Scott about once a week. Fi is a great company - place the order without any fear

Wrong. . .Prices no longer include shipping. They were adjusted for average shipping and now actul shipping is charged.

gay avatar for sure.

I have used both - BTL = motor is single larger diameter slug Mayhem = triple stacked motor (4) BTL's were 0.7 dB louder vs. mayhems with the same box, same amps, but I did not measure actual power to see if the amps were making more power with the BTL's (Maybe slightly different impedance in the box). Mayhems seem to sound a little smoother. . . Brian

I run mechman in my van. . .

did you bypass the ground prong?

The guy from AVS had some interesting results. If I read it correctly, the Behringer EP1500 went from 400 to 550 watts from 4 to 2 ohms. Nothing near the rating. I do find it interesting he said the PLX3402 made 1800+ per channel at 20 Hz at 2 ohms and 2000+ at 1 kHz at 2 ohms in his test. Every other test I see on those amps (I own one) says it does not even make the rated 1700 watts at 2 ohms. The 2 ohm rating by QSC themselves is at 1Khz, not 20-20k and he got 10% over rated at 2.25 ohms at 20 Hz. That alone kills his tests for me. . . I was thinking about selling my QSC for a pair of EP2500's. . .maybe I should rethink it now. . .

I built a system with a pair of them - 1 on an 18" sub, 1 on (8) 12" subs. They are making well over 580 watts each.

Opti4000D/Opti6000D are nice amps. Either one would power a pair of BTL's. Brian

Thanks man. . .I would love to hear your CRAZY van!!!

There are plenty of dual source switch boxes. Kicker also makes the KQ5 EQ with 2 source input and 7 volt preout.

Finally, a short video: http://s183.photobucket.com/albums/x24/bko...nt=van001-4.flv When done with the video, this is what was waiting for me on the driver's side:

your facts are off a bit How so? No pole vent to start, even with no cooling options. P chamfer is the pole is chamfered to allow air to flow better. Cooling adds the channels along the outside of the pole. Cooling includes P Chamfer.

sealed or ported? Do you have maximum dimensions?

2.3 ft. . .is it sealed? 1200 is plenty to get it going. Just need the correct box.

Need to know what speaker it is to determine if they have the correct parts to rebuild it. Will need a new basket and a recone kit.

The great 12" challenge used (1) 4" aero with a single sub and had no problems. There are multiple claims that say you can get away with 1/2 the normal port area with an aero. Let us know what you think when you get the box built. . .

It is close enough to just estimate the displacement as a 4" port. I use 14 in^2 * length to get volume displacement of each port. Also - the volume used to calculate the length for a given tuning frequency is based on the net volume, not the gross. Determine what volume you want to use, find the port length. Add the volume + port displacement + driver displacement to get gross volume. Adjust your dimensions to get that gross volume. Brian

Use your max dimensions. I am assuming sub up, port rearward. Double the top plate (1.5" thick), use 3/4" everywhere else. That makes the internal dimensions 10.75" x 51.5" x 26.5". Due to the depth of the box, and the depth of the sub, you can make a port on the rear of the box up one of the sidewalls. Make it 10.75" x 8". Run it into the box 19.25" (that should make it 8" from the opposite wall). That leaves around 6.8 ft^3 tuned to 32 Hz. Brian