[Old Davy]

Had the entire day off so bit the bullet, removed the radio cage and installed the OEM underseat Forester sub. First I put it under the driver's seat but it was 'too stimulating'. Moved it under the passenger seat and it's just right, bolstering the bass frequencies to my liking, adjustable on the sub itself or at the radio tone controls, according to taste and passenger comfort. I recommend the OEM underseat sub (can be found online for less than $100) if you want to preserve originality and cargo space. I previously replaced the deck and door speakers with 3-ways for a huge improvement. But there are times on the hiway when you just want rock-out mirror shakin' thumping...
My 97 has the original cassette radio and a cubby pocket underneath. The customer in 97 had a Kenwood 10 CD changer put in by the dealership, mounted in the trunk. Plays through FM modulation. The wired controller was filling up the useful cubby pocket so I extracted it and ran the cable up under the windshield trim to beside the mirror mount and map lights.
Did you all know the SVX headliner fabric is Velcro-friendly? Got the garage door remote stuck up there beside the visor, as well...

My thanks to Dave Carter for his comprehensive Radio How-To and sending me the male/female SVX connectors from Texas. With his guidance I transferred the 2004 Forester harness pins to the SVX connectors for a clean plug&play install with no cut wires.