Are you using the Krells with a tube pre now? I have used many in the past without the coupling caps and had nary a problem with my 700c. Having a direct path to the speakers is a plus I think.
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I have a FPB 600c and am using a ARC LS25 MKII. I called Krell about the question of engaging the coupling capacitors and the service manager told me that it is perfectly ok for me to run the ARC tube pre-amp without engaging the coupling capacitors as the ARC pre-amp has excellent DC protection on its output stage.