After hunting for the amp in the frunk am I right in thinking the most basic cdr-30 doesn't have a separate amp - wonder if photo below shows where amp should be by the toolkit?

 

Yes, this is the spot.
The ASK amplifier is part of the Sound Package Plus, I guess you dont have that option code in your car documentation.
Cheers,
Tore

 

Cheers Tore - thinking aftermarket head unit might be in my future with iPhone contact lists and nav!

 

Sorry for the thread revival once again. I'm having this same issue, but yet a little different. The speaker "feedback" that I'm getting is quite loud, not a slight hiss or buzz.

Car has been on trickle charger (Porsche CTEK) since Nov 1. On first door open a base rumble, quite loud, was coming through drivers side speakers (radio off, key out of ignition). Almost sounds as if base and volume is turned up on max. Car started without issue, yet what sounds like "audio feedback" is constant. Feedback is present with key in or out, radio on or off. Radio does turn on and all functions seem to be working. When radio on, you can slightly hear broadcast on station but is overpowered by a loud low base rumble. When radio off and key out of ignition, feedback continues for about 3-5 minutes then shuts down. Upon opening the door, feedback starts within a few seconds without putting key into ignition or powering up radio.

Am suspecting that my amp gone bad? Any suggestion or guidance would be appreciated.

 

Sorry for the thread revival once again. I'm having this same issue, but yet a little different. The speaker "feedback" that I'm getting is quite loud, not a slight hiss or buzz.

Car has been on trickle charger (Porsche CTEK) since Nov 1. On first door open a base rumble, quite loud, was coming through drivers side speakers (radio off, key out of ignition). Almost sounds as if base and volume is turned up on max. Car started without issue, yet what sounds like "audio feedback" is constant. Feedback is present with key in or out, radio on or off. Radio does turn on and all functions seem to be working. When radio on, you can slightly hear broadcast on station but is overpowered by a loud low base rumble. When radio off and key out of ignition, feedback continues for about 3-5 minutes then shuts down. Upon opening the door, feedback starts within a few seconds without putting key into ignition or powering up radio.

Am suspecting that my amp gone bad? Any suggestion or guidance would be appreciated.

Same issue. Did you ever figure it out?

 

You are describing a typical ASK amplifier failure. There's at least a couple of construction flaws in the amp that can cause it to either go completely dead, or start hissing or rumbling. All of these can be fixed though, I have a one-day turnaround for such a job.
Cheers,
Tore

 

Thanks ToreB!! Confirmed - Pulled amp fuse (Row D F10), loud rumbling immediately stopped. To my surprise, radio somewhat still works. Appreciate the help. Sending PM your way!