Have you tried other amps including SS?
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You have efficient speakers so there may be some residual hum from your Canary Amps ( I have a set of REF2) that you cannot eliminate. Start from the very end ie. connect speakers to amps, short the inputs with shorting plugs and turn them on, the level of hum you have at this point is your base level. Then work your way forward, connect the DAC to the amps if hum increases or appears you have to look at how equipment is grounded. You mention that you have dedicated circuit (s) to you system - if two circuits one from each leg of the feed to your house, this is a certain way to introduce hum in your system.
Best of luck
Have you tried one of these on the cable to your Dish Network DVR?
From what I understand Jensen makes a better and more expensive one as well. I have the Viewsonic and it works well enough.
All the best, hope it helps,
Invstbiker, if I were you I would start by disconnecting the preamp from the amp and see if the amp hums on its own.
300bs don't make a lot of power, so they have to be on efficient speakers. For this reason, they have to be hum-free. If, not, I would return it to the manufacturer for repair, unless there is a hum balanced control that simply needs adjustment.
OTOH if the system is quiet after this test, the next step is to disconnect all the inputs to the preamp and see if the preamp is quiet with amp and speakers.
Let us know what your progress is.