Raquel: I apologize for not responding about the differences between the JL3 and JL3 Signature, although I asked my CAT dealer friend and haven't received a reply (how's that for a feeble excuse?). One of the significant differences are the output transformers, I can assure you of that. Exactly what the differences are, I can't say. As far as I know there are other differences to justify the $8K premium over the standard JL3s. I'll send my friend a reminder and see if I can't come up with a more definitive description. I imagine Ken Stevens might say the JL3 Signatures are a step above the JL1 LEs. I'm pretty darn sure Ken will go on record saying the JL2 outperforms the JL1s, due in part to the use of Teflon circuit boards. It's an exciting sounding amplifier.
Brian
Brian