Few simple checks ray
Check all speaker cables amplifier end & speaker end to make sure their not short circuiting IE no lose strands of wire poking out and all is wound up smooth...also check no interconnects are touching metal to metal or using thick speaker cable or interconnects..
Could be a source issue but unlikely....
hope this helps...
Bi Amplification
Quad 33 with current Mod for CD
2 Quad 303 Bi Amped
Turntable
Thorens TD 125 MK1 , SME 3009 S2 Non Improved , Shure V15 II , SME 2000 Plinth
CD Transport & DAC & PSU
Marantz 6005 , Beresford Caiman , Paul Hynes SR4
Loudspeakers
Tannoy 615 MK2
Cassette
Goodmans GSW 435