I'm interested in the new M3-1200-A amp from d-Sonic for stereo use in near term. However, I just got an original magnum 3500-7 amp from used market for HT and want to use it's balanced input. At the back of the amp, there's a warning that says there's a risk of electric shock if balanced inputs are used. Looks like the original magnums were not grounded. How concerned should I be about using balanced input given the warning?
Speakers: Pioneer/TAD S-1EX, S-7EX, Ascend HTM200
Pre/Pro: Onkyo PR-SC5508,Bel Canto Pre-6, Sherwood 972
Amp: D-sonic Magnum 7-3500
Source:Oppo 105, Ciunas DAC, SB Touch