Dappa

I fitted my new Rockfords and they seem to be playing up.

They cut out time to time and come back to life with a whack of the door card.

As far as I am aware all connections are tight.

Any clues what it could be ?

suzuka-blue-s2k

The only thing I could think of is a loose connection somewhere. I would double check just to be sure.

TPhong

if all your connections are tight, make sure the speaker connections and/or speaker wire isn't grounding out on the chassis or door anywhere.

Baron2099

Loose connection, amp power surge, or loose amp connection to the battery under the hood

Round 3

Speaker terminals might be hitting the door skin or window might be hitting it on the way down. do you have speaker spacers?

eumylove

Maybe its a defective speaker. The voice coil might be torn and when it bumps or rattels it can disonnect or have a loose end. If all the connections are correct you should deffinatly check the speakers it self