Hello hardhattg ! Bi amping is worth it if you add an electronic crossover to your system along with the extra power amp. An electronic crossover lets you get a 24 db/octive (very steep) crossover that keeps the tweeter and the woofer from unwanted overlaping each other AND lets you get rid of the (generally low quality) crossovers in the speaker cabinets. It will connect after the preamp and feed the power amps. If you choose a DBX 223, you get to play with the levels and crossover points. Great Fun! There are different models with different connectors. be sure to get the type you need.
So, open up the speaker cabinets, remove the existing passive crossover parts. Connect the woofer directly to the old terminals (if they have magnetic parts, replace with (at least) brass terminals. Connect the tweeter wires to a new pair of non-ferrous terminals. (If you experiment a lot, add a 20 mfd or larger high quality capacitor in series with the tweeter to keep the buzz out if you happen to make any sort of mistake when the power amps are on.) Your power amps now connect directly to the speakers, allowing their damping factor to influence the drivers, vastly increasing their ability to control distortion. The difference will delight you. (High quality cables will really show up now.) Enjoy the music.