For a speedy processing of your order, please ensure you enter your phone number at checkout. "Hum" noise is a common problem in sound systems, even with the volume control set at minimum level. The HEB-100 is a low-cost tool that you can use to prevent the "hum" caused by ground loop. This unit can also act as a converter of unbalanced signals. | "Hum" noise is a common problem in sound systems, even with the volume control set at minimum level. The HEB-100 isa low-cost tool that you can use to prevent the "hum" causedby ground loop. This unit can also act as a converter of unbalanced signals. Specifications Frequency Response: 10Hz~50Hz, +/-5dB@+4dBu THD: 0.1% typical@1 KHz, +18dBu Insertion Loss: 4dB @ 100K U load 5.5dB @ 600 U load Connections: 1/4" TRS balanced / Unbalanced Jacks Power Requirements: Passive Dimension: 113 x 75 x 40mm Weight: 400g Weight: 0.498