Sub hitting rapidly at a certain volume

[dross93ranger 10+ year member]

I just installed a cd player, amp, and subwoofer in my Ranger. I have done plenty of installs without one problem, until now.

The sub hits fine at low volumes, once I hit a higher volume the sub will start hitting rapidly(nonstop), even if I turn the volume all the way down it wont stop. The only way I can get it to stop is by pulling the RCA's out of the amp or turning the amp gain knob down 1/4 turn (down to half). I had a different cd player in the truck last week and different sub, same amp. The amp acted fine on my other sub, but was wired up 4 ohm so it never reached 300w like it is hitting now.

Where do I need to start on diagnosing this?

Headunit was used, amp was used, sub is brand new.

Also wires are nowhere near touching, and the amp is 300RMS at 2 Ohm and the sub is 300RMS.

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[Heeltoeclutch 10+ year member]

This reminds me of when my old powered sub was pulling ground through the RCAs - it would do something similar...

Your grounds are solid?

 

[dross93ranger 10+ year member]

They are solid, I just redid the amp ground as well just to be sure. I have some different RCAs I can swap out.

 

[dross93ranger 10+ year member]

Ran a brand new set of RCAs from the headunit, over the seat and into the amp and its still doing it.

 

[dross93ranger 10+ year member]

Alright bypassed the amp gain knob and its in the headunit. Now it will do it all the time. Thanks for your alls help. In the meantime I have an old Alpine CD unit I can install.

 

[dross93ranger 10+ year member]

Confirmed, I just installed a really old Alpine I had sitting around and now it works perfect. Are there any known problems with rcas on Kenwood units?

 

[Heeltoeclutch 10+ year member]

Glad to hear you found the issue... I don't know anything about kenwoods but someone will //content.invisioncic.com/y282845/emoticons/tongue.gif.6130eb82179565f6db8d26d6001dcd24.gif