starman wrote in message ...

The '94 has full digital controls for all
functions while the '91 has conventional knobs (pots) for volume and
tone.

I didn't know that.

Good idea with checking Crutchfield.

It doesn't happen often, but occasionally I have one.

The OP's friendly local Circuit City, Best Buy, or other automotive
sound system installer would surely have the information as well. It's
hard to imagine they would mind being of assistance.