MarkBlair
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ZYGI & ski bum -
Thanks for the replies! Objectively, however, I may be too nit-picky about this hum. I set up my SPL meter on a tripod at my nearfield listening distance (about 30 inches) last night, and the ambient room level was a bit over 41dB. Then, with only the amp (no preamp) turned on, the SPL measured about 44dB. Which -- to be fair -- is still pretty low! And, in all firness, the hum is just barely audible with nothing else coming from the speakers. Incidentally, it read the same with the peramp on, too.
My challenge now is to figure out whether this is actually within limits (the manual just mentions a max 1.5mV of noise + hum). But it's not a show-stopper, so I probably won't adjust my listening distance or even expend too much time troubleshooting it further -- unless either of you two (or someone else) see's a problem here.
My room is not an ideal size for recording/mixing -- just 10'x12'x8' high. And I'm currently in what's considered by many acoustic "experts" to be the best listening location (3/8 the lenght of the long wall away from the short wall -- so I'm now 54" back from the center of the short wall).
Plus, to form a roughly equilateral triangle with the speakers, while still keeping them far enough from the walls (my PMC TB2S+'s have a rear-pointed Advanced Transmission Lines and need some room for the bass to "breathe"), I don't have any real maneuvering room.
So, I'm kind of "locked" into my current listening location. Also, with 90dB speakers, I don't want to ask the SE84C+'s 1.8 watts RMS into 8 ohms to go past its limits, either.
And changing my PMC TB2S+ speakers for something more efficient at this time is non-negotiable (google them and you'll see what I mean).
So, it's probably onto recording and mixing for the time being. After all, humming a tune is a lot more interesting than tiuning the hum...
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