The HumDinger blocks up to 0.7V DC volts on your power line.
If you hear any power transformer buzz hum from your equipment, the HumDinger probably will eliminate this issue.
We mean noise coming directly from the equipment itself, not from through the speakers.
If not, simply return it for a refund.
If your DC offset on your power line is more than 0.7V, then probably two HumDingers in series will fix the issue.
Frank