HUMBUSTER Dual Channel Hum Eliminator User Manual HMX-2
Thank you for choosing Kopul. Kopul’s HMX-2 Humbuster is an effective yet costeffective way to eliminate the 60 cycle buzz and noise caused by ground loops. By inserting it into the line level signal path (+ 4dBu or -10dBv), the HMX-2 eliminates the ground loop while leaving your signal intact. A humming or buzzing sound is often a telltale sign of a ground loop caused by the formation of a connection path between the grounds of two or more pieces of equipment.
The Humbuster features inputs and outputs for both 1/4˝ and XLR plugs that can be used in any combination (see diagrams on page 5). It automatically converts unbalanced signals to balanced signals and vice versa. This is advantageous when using a long length of unbalanced cable, which can pick up interference, by converting it to a balanced signal before it reaches the mixer input.
Instructions 3 1. Disconnect, turn off, and remove the power cords of all equipment except for one piece – such as the mixer. 2. Connect one piece of equipment at a time, making audio connections first, then plug in the power cord, and turn on the power. Listen for noise. 3. Continue this process until you have identified the piece of equipment causing the noise. 4. Plug in the Humbuster between this piece of equipment and the rest of the system.
• Example #2—If there is hum coming out of powered speakers that are connected to a mixer: Plug the mixer outputs into the inputs of the Humbuster, and the outputs of the Humbuster into the inputs of powered speakers. • Example #3—If you experience hum and noise when connecting the unbalanced output of a computer sound card to a mixer: Plug the outputs of the sound card into the inputs of the Humbuster, and the outputs of the Humbuster to the inputs of the mixer.
Use your Humbuster in any of these configurations HMX-2 HMX-2 Humbuster CHANNEL 1 INPUT Humbuster CHANNEL 2 OUTPUT INPUT CHANNEL 1 OUTPUT 1/4˝ in to 1/4˝ out (TS or TRS on either end) INPUT CHANNEL 2 OUTPUT HMX-2 INPUT HMX-2 INPUT CHANNEL 1 OUTPUT XLR in to 1/4˝ (TS or TRS) out 5 Humbuster CHANNEL 2 OUTPUT OUTPUT 1/4˝ (TS or TRS) in to XLR out Humbuster CHANNEL 1 INPUT INPUT CHANNEL 2 OUTPUT INPUT OUTPUT XLR in to XLR out
Specifications Inputs 2 × 1/4˝ TRS / TS 2 × XLR Outputs 2 × 1/4˝ TRS / TS 2 × XLR Frequency Response 20 Hz to 70 kHz Distortion < 0.005 THD @ 1 kHz Crosstalk > -97 dB Maximum source impedance 1k Ω Minimum load impedance 10k Ω Dimensions (H × W × D) 1.4˝ × 4.5˝ × 3.25˝ (3.5 × 11.4 × 8.3 cm) Weight 15.2 oz.
Two-Year Limited Warranty This KOPUL product is warranted to the original purchaser to be free from defects in materials and workmanship under normal consumer use for a period of two (2) years from the original purchase date or thirty (30) days after replacement, whichever occurs later.
