[Paul[_13_]]

Unfortunately, Fender has either made a design flaw in this
amp, or they got a bad batch of cheap 8 Ohm speakers. This
is obvious because a Google search shows many people have
blown the speakers on these units. The particular unit
I am repairing is only 3 months old, from date of purchase, and
both speakers were blown during a gig.

The spec sheet for the Rumble 350 is 370 Watts into 4 Ohms (8 ohms
parallel).

From what I researched, these Eminence speakers should do the
trick:

http://www.eminence.com/pdf/Legend_B102.pdf

I was not able to find a 10" speaker higher than a 200Watt rating.

About $80 a pop on Ebay.

If someone knows of a cheaper, but equally good speaker, please let me
know, but I really would like these replacements to LAST.