Of the two c-j amps you list, the Premier 12's were
introduced in 1993 while the LP140M's came out in 2006. The
Premier 12's are going to give you the warmer sound
associated with the older c-j house sound.
One other thing, the LP140M's use the CDJ Teflon coupling
capacitors and this does definitely result in a more
neutral, less "tubey" sound. I discovered this for myself
when I had the C1 capacitor upgrade done to my Premier 140
amp.
introduced in 1993 while the LP140M's came out in 2006. The
Premier 12's are going to give you the warmer sound
associated with the older c-j house sound.
One other thing, the LP140M's use the CDJ Teflon coupling
capacitors and this does definitely result in a more
neutral, less "tubey" sound. I discovered this for myself
when I had the C1 capacitor upgrade done to my Premier 140
amp.