Because I wanted to see if people thought it was the preamp and what they thought if?t might be, duh. Why ask?
A follow-up that isn't good: as above, I called Conrad Johnson and they said the tubes were well past their expiration date. So I had to wait a week for tubes to arrive. I got them in today and, while it sounded better, something still wasn't right. I finally thought of turning the balance knob and, sure enough, when I put it all the way left there was very little output from the Maggie on that side and what output there was was very muffled and constrained. So I switched the preamp outputs and the problem stayed on the left side - which to me tells me it's the speaker, right? Could an interconnect or speaker wire cause that? I should think that would be exceedingly unlikely, no?