distortion

[ben lague]

For some reason when I turn up my punch bass it distorts tremendously. I have a rockford fosgate 250.2 and a 500bd. I am running a stock cd player with momo components off the 250 and a momo 12 off the 500 bd. I just got everything recently and it was all brand new. Maybe not the most professional people installed it but they did it right, i think. They said it was the sound of pushing alot of air, but it sounds like crap to me. i turned the sub around, so it faces toward the seat, and it helped alot. they box is a .85 qlogic type 1 and its all in a 2001 frontier crew cab. I listen to rap and didn't realise i picked the wrong sub for my music, but i don't want to have to change it because I think it has alot of potential. Would a bandpass box be alot better? Any help would be greatly appretiated.
Sincerley,
a desperate and frustrated polk fan

[Kim]

Ben,
The first thing that I would recommend is removing the MM120 out of the Q-Logic enclosure. This woofer needs a air tight seal to perform at its best. The "Q-Ring" is very difficult to get a good air tight seal. Plus the particle board enclosure can not withstand the intense pressure generated by this woofer. Look for a 3/4" MDF .88 cubic feet sealed enclosure. Check the enclosure to confirm if there is a air leaking form the enclosure. You can take a piece of tissue and go around the outer perimeter of the woofer's
basket to see if there is any air escaping from the enclosure.
I would suggest looking at a enclosure from the folks at SubZone. The model number is H-121LQ. This is a 3/4" .88 cubic feet sealed enclosure and the cost of this box is between $ 75.00
to $ 85.00 each. Reseal all interior seams with a silicone caulking.
You can reach SubZone at ( www.subzoneusa.com ) or call them at (800)-810-8728
Have you set the high pass and low pass crossover to the same frequency?? If not, try setting the crossover between 80 to 90 Hertz for the front, rear and subwoofer. If the front and rear speaker are running full range along with the woofer, there is probably some low frequency cancellation occuring inside of the vehicle. The end result is a very thin, ill defined bass response. You don't want the front, and rear speaker reproducing the same low fequencies as your woofer.
If you have any questions, feel free to give us a call at (800)-377-7655 between the hours of 9 AM to 6 PM Eastern time, and we will be glad to help.

Good Luck!
Kim

[95RollaLX]

I seen u said that momos arnt desinded for rap? What their not good with a rapid change of notes or something? What kind of music would be good for them?

[Kim]

For RAP music you would want to build the band pass enclosure that we have on our website. This enclosure has "gain" incorporated into the design so you will not have to drive the woofer very hard to get a incredible amount of bass. For this combination you can use a amplifier that has a power rating of 400 to 600 Watts bridged. Simply click on the woofer, then on box plans.

Thanks,
Kim