Does the Mig only have one speaker output? I've never heard of a y-speaker cable, the only way I would know of (other than a second output on the head) would be to daisy chain the cabs.

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Guitars:
Orville by Gibson Les Paul Custom (EMG 85/85)
Orville by Gibson SG Standard '61 RI (Gibson "The Original")
Orville Flying V (JB/59)
MIJ Fender Strat '54 RI
Warmoth Partscaster (EMG 89/SA/SA with SPC)
SX SST Ash P90
Alvarez PD80SC

Amps:
Marshall JMP MkII (100w)
Ampeg V-4B
Epi Valve Junior

Main Rig
Guitar -> Boss DD-6 -> Boss CE-5 -> Boss SD-1 -> RMC Wizard Wah -> ISP Decimator -> Korg DTR-1000 -> BBE 482i -> Marshall JMP -> Marshall 1960A

Complete list of my massive amount of gear