GXR124 cone moves with out music

[LILDRAGON]

Hi I am fairly new to car audio and I am not sure if I setup anything wrong. My GXR124 is making a buzzing sound and lots of cone movement when the engine is on. With out the engine on the cone stays still when no bass is needed. I am running a Rockford Fosgate RFX9300, Lightning Audio S4.600, Lightning Audio 4gag wires, Stinger Dream Series RCA. The amp is pushing out about 100W RMS (suppose to be 150W RMS at 14V) to the sub. The sub is mounted in a sealed 1.25cu box with half of it polyfilled. On the other channel is a Alpine bandpass box. The car is a 98 Honda Accord LX 4 Door. Thanks for all the help.

Also have another q's is I just bought the MM124. Will it sound okay in the same box and will 350RMS push the sub enough. The amp is rated at 450RMS 4ohms @ 14V if I bridge the channels. Thanks again for any help and keep in mind that I am money tight and just want hard pressure bass (SQ can come after).

[Kim]

I would suggest doing some troubleshooting. We need to find out where and how the signal is being contaminated. First try disconnecting the RCA cables and then turn on the system. If the noise is gone the install a new pair. There maybe a a bad or broken gound or shield connection in the cable. Can you use a different source for the input to the amplifier? If you can, then this will tell you if the problem is with the head unit. The next step would be to measure the voltage at the battery and compare it with the voltage that is at the amplifier. Double check your ground connections. There maybe a loose or dirty connection.
If all of the above does not yield a good result, then return the amplifier to your dealer for service or exchange. But judging from your desription, on of these recommendations should eliminate the problem.

Regarding the enclosure... your 1.25 cubic feet sealed enclosure is too big for the new MM124. This woofer requires a sealed box volume of .88 cubic feet and we recommend using a amplifier that has a power rating of 500 Watts Bridged into 4 Ohms to drive these subs.

[LILDRAGON]

Thanks for the answer I am pretty sure now that it is the RCA somehow, but i'll know for sure over the weekend.

Reguarding the box would a bandpass give me more pounding bass than a sealed box with the same amp config for the MM124? Thanks.