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Basses: Geddy Lee, Jaguar, Fender PB-551, Mark Hoppus Jazz, Michael Kelly Firefly
Head: Markbass LittleMark II
Cab: Markbass Traveler 102P x 2
Its not really 'biamping' unless there's a crossover that's splitting the frequency ranges across a couple amps to different cabs.
Speaking of cabs, the OP doesn't say if he's trying to run 2 amps into one cab or two separate cabs. If the answer was a single cab, than that's a NO-GO. If its multiple cabs than there are a variety of ways to do this.
I do this as my standard rig. Would never use a single head on stage.
1. A BOSS CE3 has 2 outputs - 1 into each amp
2. A spliter plug (bought a few of them for $1.50 ea on Ebay) from my tuner into 2 amps
3. Some Tuners I haev heard have 2 outputs
4. some other pedals have 2 outputs
5 Splitter (Y cable) as stated above.