ovnilab.com <-- always the best resource for bass comps. I don't believe you must have a multiband comp for bass, even 5 strings, but it may help you achieve your sonic goals. FEA labs makes an excellent dual band comp IIRC.
I use a Cali76 which is based on the Urei 1176, the most used studio bass comp since the early seventies. It is single band. I love it with my Fender P5s. No loss of highs or lows when set properly.
Basses: Fender Am Std P5 (x2)
Amp: Verellen Meatsmoke Preamp, Crest Pro-lite 2.0
Cabs: Fearless F115, F112