troubleshooting.. it could be so many things - improper grounding would be the first thing i'd think of, but it might also be the headunit, the amp, the sub. can u try the head unit without the amp and sub? also, it appears which side the wire the rca/power might be a possibility. it's their responsibility to fix it anyway.
it's definitely not normal. if bill has been paid in full, try to get them to fix it otherwise small claims.
if it hasn't been paid, withhold payment.
the 'young men' doing the installs are contractors/apprentices..who obviously don't give two hoots. i had the same problem when i installed.. never again. i always look for family owned businesses now with installers who own the business and have years of experience.
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