Kapow420

Not to sure what the problem is so I came here in hopes of some feedback. A friend of mine just lent me his system cause he doesnt have wheels for the summer but I'm not sure if he's ever run them because I'm getting a really weird sound on the bass hits comming from the box... I think.

I'm running two 12" Infinity KAPA's that have a 1200w peak and 430rms I believe. They are in a "BASSWORX" factory box where both subs are seperated and seperately ported with what looks like about a 1.5"X10" square port. All being Run off an 800rms MTX Thunder amp.

The issue is that when the bass hits (with the volume up) i get a weird snap, almost scratch sound. I've checked the subs and they dont seem blown. I had them running out of the box, and they sound perfectly fine. If I place them in the box but lift the sub up a bit (as to let air pass in and out of the sub hole itself) I get no weird noise but it's not until tighten the subs down that I get the weird snapping noise. And it looks like the subs are flexxing back with the pressure after every hit (like the sub hits and the air has trouble leaving the port so it snaps back at the cone) Which leads me to believe that it might be a port issue. I feel that if the speakers had enough air movement that this back pressure would be let out elsewhere and not force the sub to snap back against itself.

Not to sure if this is the issue though because I dont have a whole lot of knowledge when it comes to car audio so I was hopping to get a litle help on here.

DeadlySones

iTrader: (4)

The subs are unloading. You need to set the subsonic filter higher. Them BASSWORKS boxes are tuned really high. Usually around 45-48hz. When you play lower notes at high volumes the sub unloads and causes this fast snap your witnessing.

Its an easy fix, turn up the subsonic filter to stop this at the expense of loosing some lows, or else, get another enclosure built for them designed to play what you like to hear.

HTH

Kapow420

Fooled around with the amp, lowered the Gain and turned on a Filter that works on a switch. There is no dial to set level of the filter though. The filter helped out alot and lowering the gain and other levels reduces the snap back but at the cost of that punch I would like to feel. Just running it on low for now so I dont wreck the subs but I would really like to either make this enclosure work with these subs by tunning the box to the specs of the subs (but would not know where to start) Or just make a whole new box for the subs if I just can't make this one work for whatever reason.

Here are the specs if anyone feels like helping out a guy who knows very little about about car audio tunning and thought this system install would have been alot simpler. Any help would be appreciated though.

Subs: 2-12" Infinity KAPPA Series 122.7

Speaker Type-Passive
Speaker-Diameter 12"
Nominal (RMS) Output Power-350 Watt Response Bandwidth-18 to 250 Hz
Input Impedance-1/4 Ohm
Sensitivity-92 dB
Magnet Type-Neodymium
Connectivity Technology-Wired
Additional-Features Dual voice coil

Box: Bassworx's Dual 12" Slot Ported (Mod#GPH212BK)

The site says Box has a CuFt. of 2.8 (not sure if thats each enclosure cause each sub is seperated in the enclosure) and is tuned to 38Hz (kinda all french to me, not too audio savy)

Amp: 1-MTX Thunder tc8001

Amplifier signal to noise ratio-75 dB
Amplifier continuous power/channel qty-400 Watts x 1 Amplifier output-1 channel
Amplifier high level inputs-Yes
Amplifier input signal voltage-0.1 to 5V
Crossover type-Active crossover
Crossover slope-24 dB
Crossover low pass frequencies-40 to 200 Hz
Crossover bass boost frequency-40 Hz
Crossover bass boost gain-0 to +18dB
Amplifier total output power-2400 Watt
Amplifier/Amplifier Class-Class D
Amplifier distortion factor-0.25%
Amplifier Output Details-400 Watt - 4 Ohm - THD 1.0 %
-1 channel(s) , 800 Watt - 2 Ohm
-THD 1.0 % - 1 channel(s)
Additional features-Subsonic filter
-Input level controls