The best way to improve the bass in these wonderful speakers is to replace the sheet metal screws holding the woofers in place with #10-32 machine screws threaded into "tee" nuts. This only takes an hour to do.
Then completely bypass the low pass network of the internal crossover and use an active crossover and a good solid state amp (I currently use a Bryston 10B crossover and Bryston 7B NRB amps for the woofers in my RS-IIB's).
Replacing those loose banana jacks with good binding posts while you're in there certainly won't hurt.
If it's been a while since the woofers were last refoamed, you should send them to Bill Legall at MillerSound and have him do his magic as long as you have the speakers in pieces.
Then completely bypass the low pass network of the internal crossover and use an active crossover and a good solid state amp (I currently use a Bryston 10B crossover and Bryston 7B NRB amps for the woofers in my RS-IIB's).
Replacing those loose banana jacks with good binding posts while you're in there certainly won't hurt.
If it's been a while since the woofers were last refoamed, you should send them to Bill Legall at MillerSound and have him do his magic as long as you have the speakers in pieces.