I have an older car which came with a AM/FM radio/tape deck type stereo. These days to listen to music in the car I usually take one of those line out to tape deck adapters with the "fake" tape and run it off the headphone output in my phone.
The other day when I started up this little system wasn't working correctly. It usually sounds pretty decent, but suddenly it sounded like it was being played through a bad AM radio - all the kick drum and bass guitar was gone and it sounded like there was some strange phase cancellation issue happening. The headphone output tests fine, and I tried using a different line out to tape deck adapter and the same problem is happening.
Any idea what could be going on?