Hi Shoshis, assuming you're listening to MC mode in the "15 ohm" or "4 ohm" positions through a full-range system, then that sounds like you've probably got a quiet unit there, but I'll add that the hum, if you had any, wouldn't be most apparent through the tweeters -- that's primarily the random noisefloor, which is also quite low in my unit. The LF hum I have however can be very clearly detected, not only audibly, but by placing a fingertip on a woofer cone, where as a defined sinusoidal hum it feels very different from the lower random noisefloor shown in MM mode.
BTW, I noticed in Atkinson's comments in Stereophile he mentioned that he "did not find any interaction between the phono inputs". This doesn't seem to be the case with my unit however -- with a signal present at Input 1 and Input 2 unconnected, I can nevertheless hear the music faintly through the speakers when Input 2 is selected on the front panel. Conversely, when listening to Input 1 with MM mode selected at the rear panel, I can still hear some mild frequency response modification when changing SUT impedance taps at the front panel -- which correlates with the fact that the rotary-control switching transients can also still be heard, so clearly the SUTs aren't totally removed from the circuit by the rear-panel switch.
Also, when I turn my 324 off, after a slight delay I get a dying-quail high-frequency tone though the loudspeakers that lasts for a second or two, at a volume high enough that, if I don't mute or turn down my preamp first, would give me cause for concern for my tweeters. Anybody else notice this?
BTW, I noticed in Atkinson's comments in Stereophile he mentioned that he "did not find any interaction between the phono inputs". This doesn't seem to be the case with my unit however -- with a signal present at Input 1 and Input 2 unconnected, I can nevertheless hear the music faintly through the speakers when Input 2 is selected on the front panel. Conversely, when listening to Input 1 with MM mode selected at the rear panel, I can still hear some mild frequency response modification when changing SUT impedance taps at the front panel -- which correlates with the fact that the rotary-control switching transients can also still be heard, so clearly the SUTs aren't totally removed from the circuit by the rear-panel switch.
Also, when I turn my 324 off, after a slight delay I get a dying-quail high-frequency tone though the loudspeakers that lasts for a second or two, at a volume high enough that, if I don't mute or turn down my preamp first, would give me cause for concern for my tweeters. Anybody else notice this?