BiBer wrote: > Phil Leigh;396635 Wrote: >> try a different interconnect cable between SB and amp (just as an >> experiment) > > Already done this, tried some good quality cinch strips, and then > several thin cables, the sort of cables you get with new gear. It > doesn't seem to change anything, only the thin cables are sometimes > picking up some 50Hz hum. > > Phil Leigh;396635 Wrote: >> Normally a "bump" as you describe implies a low level of DC on the >> outputs. This should be being blocked by output capacitors in the SB. > > So the "bump" is the normal behavior of the SB? Or are the output caps > faulty? > >
Usually, devices like these are capacitively coupled (as Phil said in his post). This filters out any DC components which might harm sensitive hardware. Assuming this, it sounds like the DC level of the unselected SB is creeping off 0 volts when not sourced by your amp. On the other hand, depending on how your amp is put together, I could imagine the DC level of the "other" source you are switching from is significant. That is, maybe, switching from the other source to the SB is causing what sounds like a thump. I can't imagine it is the SB as described in the first paragraph above. Simply because the SB's power supply is a "wall wart". That is, the SB floats and isn't grounded to the outlet. If it is as described in the second paragraph above, try unplugging the source from which your are switching from when you hear the "thump" as you switch to the SB. You your self said the "thump" is not always the same. I bet it depends on the source you are switching away from. In any case, it is always a good idea to plug all your audio equipment into outlets that are near each other to eliminate possible differences in ground potential. I would recommend getting a properly or overly rated power strip. (One last note, when you put "bump" into a forum subject line it sounds like you are "resurrecting" an old thread. Just FYI.) _______________________________________________ discuss mailing list [email protected] http://lists.slimdevices.com/mailman/listinfo/discuss
