subs vibrating randomly

[M@nJo 10+ year member]

i just installed a brand new set of front door components at a audio shop. they also adjusted my deck settings like EQ's/bass/treble/etc.

so after 15min of play time on 50% volume, my subwoofers just started hitting by itself. like its a vibration of bassline. it was pretty loud and just occured in the middle of a track (kurupt - we can freak it). that song has a heavy bass line/notes and i thought it was part of the song until the bass i was hearing/feeling was part of the track. //content.invisioncic.com/y282845/emoticons/eyebrow.gif.fe2c18d8720fe8c7eaed347b21ea05a5.gif

so i immediately parked my car and shut off and removed the key out of the ignition and it went away. weird thing is, i turned the key all the way to off but the subs were still humbling and humming. until i removed the key out of the ignition.

this has happened before to me last year, but i really couldnt figure out why this occurs?

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[Blados 10+ year member]

99% chance it's a bad ground spot.

 

[shonKd_CivIc]

feedback thru your RCAs.

either (as suggested) dodgy earth

Or you may have a dodgy set of RCAs, I recently had this problem myself where even with the h/u off I would get feedback.

Spent 5mins trying out every output on the h/u then tried a new set of RCAs and it was the RCAs had been squashed at some point.