I have a Clubman with the HK audio system, and one of my door speakers is making horrible noises. Should I just a replacement HK speaker for the failing one and toss it in there? Is there something I can do to determine if it is the speaker or the amp before I buy a new speaker?

 

I would swap it with the other door speaker to see if it changes sides. If not, it still could be the amp, head unit, or wiring.