Subwoofer suddenly started rumbling with the receiver off.

has it ever worked, if so did you ever use it in the cold because in the cold it is possible for the wiring inside the speaker to crack and break

if you turn the bass setting in your radio down it will take the bass out, but may take some of the bass out of the subs as well, if this occurs and you still are not satified, you either have to get a car receiver with a non fading subwoofer preout, or you could get bass blockers for all the speakers you dont want the bass in

if your unit come with external Adaptor power up type. then mostly is the adaptor already blown, replace the adaptor will do.

When a subwoofer first notices a signal on the incoming line, this causes the amp to kick on which can result in some initial "noise" as the amp powers up.

Subwoofer is center speaker from A+B speaker signals. first check your wire to the receiver. Otherwise you need electronics service on the amplifier inside the speaker.

THE T9510-04 SUBS ARE SINGLE COIL SUBS AND YOU CAN VIEW THAT WIRING DIAGRAM AT THE FOLLOWING LINK:
http://www.mtx.com/caraudio/products/subwoofers/TechData_T9510-04.pdf

THE T9510-44 SUBS ARE DUAL VOICE-COIL SUBS AND YOU CAN VIEW THAT WIRING DIAGRAM AT THE FOLLOWING LINK:
http://www.mtx.com/caraudio/products/subwoofers/TechData_T9510-44.pdf

SINCE YOU NEED A 1 OHM LOAD, I PRESUME BRIDGED AND ARE USING TWO SUBS, THEN HOPEFULLY YOU HAVE THE DUAL VOICE COIL TYPE, AS THEY ARE DUAL 4 OHM AND YOU WILL HAVE TO CONNECT THE VOICE-COILS IN PARALLEL WHICH WILL MAKE EACH SPEAKER A 2 OHM SPEAKER AND THEN CONNECT THE TWO SPEAKERS THEMSELVES IN PARALLEL AND THIS WILL PROVIDE YOU THE 1 OHM LOAD. IF YOU IN FACT HAVE THE SINGLE 4 OHM VOICE COIL VERSION, THEN IT WILL ONLY PARALLEL THE PAIR DOWN TO 2 OHMS. OK. LET ME KNOW IF YOU NEED FURTHER ASSISTANCE.....V

check ur rca cables might be broken

I assume this is an active sub. The amplifier has most likely failed. You have proved the signal source is not the problem, well almost if you can sucessfully connect the aiwa sub to another amp then we will know for sure. Usually amplifiers fail with an output device short circuit. The hum you here is the power supply direct on the speaker, I would not leave it on for long or speaker damage may ensue.

Ok it sounds to me that your remote wire is not hooked up right casue if you trun your car off then your amp should power down an when you trun your car on it should power up

Check at a Walmart first because they would be the least expensive. If they don't carry it, go to Radio Shack.

Please mark this as a Fixya!