Hachiroku $B%O%A%m%/(B

My Mazda 626 seems to have an appetite for speakers.
I have replaced the passenger's side front speaker for the third time a
couple weeks ago, and already it's buzzing like a bee is trapped in it.

The speakers installed are capable of MORE than the rated wattage of the
JVC Cd player (~22 Watts per channel, speakers are 50W or more)
All the other speakers work great, including the Driver's side dash
replaced in January as a set with the one that went bad a couple weeks ago.

There aren't any leaks, there doesn't appear to be any 'stray magentism'
anywhere around, no obstructions or protrusions of any type into the
speaker area.

I'm out of 'inexpensive' speakers (the last one that blew was a Clarion,
not the most expensive, but not a cheapo by any means...) Connections are
tight.

Usually audio problems don't throw me, but this one has me stumped.

Any ideas?