Preamp Audio Research GNS LS7 to LS15. Your view?


Is it worthwhile to upgrade from a GreatNorthernSound modified LS7 to a stock ARC LS15 with infiniCaps?

The additional remote is a bonus but not essential.
The GNS modified LS-7 is very musical with my Amperex tubes but I am just wondering if LS15 can go further.
Upgrading fever... I guess.

Any opinion is welcome.

Current setup:

Sony XA777ES CD Player
GNS modified ARC LS7 pre
McCormack DNA0.5 RevA power
DIY Scanspeak speakers
DIY interconnects
Cardas Hexlink Golden 5C SpeakerCables
tankaiyiap
My take on this is the LS-7 in it's stock form is better sounding than the LS-15. Look to upgrade someplace else.
Sturgus