Electricity is vital to sound systems but can often be affected by various interferences, distorting the alternating current (AC) wave and reducing sound quality. The problem of “DC in the power supply” is common, especially with amplifiers.
Although electrical outlets in the home are intended to provide pure AC power, various household appliances – from lighting controls to home appliance power supplies – create “unbalanced loads”, causing DC voltage in the AC supply.
When a small amount of DC voltage from the supply reaches the transformer, it can cause “saturation,” causing the transformer to produce a significant and persistent buzz. You can hear it when you put your ear close to or next to the enclosure.
The DC Blocker+ is a clever device that, when placed in the IEC (the rear power input), blocks DC from entering the amplifier, thus eliminating the transformer hum.
