HEB100 PASSIVE HUM ELIMINATOR 2 CHANNEL MCLELLAND MCLELLAND HEB-100"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