Samuel33, I'm not sure what your concern is. In his review of the CAT JL2 Sig mk.2, Marc also used a CAT preamp and the ARC Ref 3 preamp. For the record, he wrote:
"I used the JL2 Signature Mk 2 with CAT SL1 Ultimate Mk 2 and Audio Research Reference 3 preamps, and the Aurum Acoustics Integris CDP CD player/preamp. Sources included an Audio Research Reference CD7 CD player, an Ayre Acoustics C-5xe universal player, and Zanden Audio's Model 5000 Signature DAC and 2000 Premium transport. Speakers were Wilson Audio WATT/Puppy 8s and MAXX 2s, and Verity Audio Lohengrin IIs. I had an abundance of amps on hand for comparison, including Lamm ML2.1 SET and M1.2 Reference hybrid monoblocks, Atma-Sphere MA-2 Mk III OTL monoblocks, an Audio Research Reference 110 stereo tube amp, and a Conrad-Johnson Premier 350 stereo solid-state amp."
http://www.soundstage.com/revequip/cat_jl2_signature_mk2.htm