Hi. I own a JCM900-4100 (100W head) and two different cabinets: one 1960AV and one Laney 2 x 12" Ironheart.

I normally use just 1960AV with 16 ohm commections (I prefere than run 1960AV in stereo with two 8 ohm connection), but it happends to use both cabinets, usin the 2 x 12" on the other side of the stage as "monitor" for the bass guitar player... can I set JMP900 as "4 or 16 ohm" and use both "speaker out" one to 1960AV (16 ohm input) and one to Ironheart (8 ohm input)?

I use to store my 1960AV in the practice room, so, if I need to play at home, or in small gigs, I use Ironheart 2 x 12" only: how should I set the amp to connect a single 8 ohm speaker?

Thanks, Luca