Miniwatt bi-amp solution

I really enjoy my Miniwatt N3, the sound is just incredible (with a little help from REL R305 in the bass department). I have been considering getting a second Miniwatt N3 and use it in the bi-amp configuration. Can it be easily achieved with a simple RCA splitter? (The Logitech has only one set of output RCAs) I know, I would have to carefully adjust volume on both amps. Another option would be a passive preamp with 0dB gain. This option might be tricky with impedance matching, right? Any suggestions would be greatly appreciated. Thanks.