Popping when kids are jumping

OK, so it’s likely the amp. Turn it off. Open the amp. Turn it on with speakers connected and no inputs. Use a thin wooden stick to gently prod at different parts inside the unit until you cause the popping. That should indicate where the fault lies.

"Turned the amp off, dac on and gone"

Obviously ;-)

If you think the fault lies within the amp - with it turned ON and nothing connected to it other than speakers,  lift one side maybe 1/2 " or so and let it fall back down,  try both sides. If theres a loose solder joint or connection inside that can be exited by the quite small vibrations form bouncing kids on the floor, above will certainly expose it.

Best of Luck

Peter

Mass and elastic.
I would not go 'poking around with a stick' inside an open amplifier with it turned on.. But that is just me.
I do swap duplex with power on at times.. Some things are scarier. (mainly due to fear of blowing up amp.).
Anyway, my notion is get a nice 20" or 24" suitable concrete patio square for $4 at Builder's square. and a couple of rubber pads.
I also added tip toes under the concrete, but that may be unneeded.
I also use #10 butyl chemical bottle stoppers.. But any sort of rubber bumps will do.Amazon has sorbothane rubber feet. main ones called "Isolate-it"in all sorts of weight carrying sizes
Place the amp feet on the rubber on the concrete square.
Problem solved.