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I helped a school to purchase 6 XD-V55L units. Five of them check out great, with good, clear sound. The 6th unit sends a hum, along with the signal from the mic. I tried it with different mics and different receivers. Any ideas? Thanks, Roy
Product Manuals: XD-V55 Pilot's Guide XD-V55H Pilot's Guide XD-V55HS Pilot's Guide XD-V55L Pilot's Guide XD-V55 Features: 300 foot (100 meter) range 12 Channels supporting up to 12 simultaneous systems 24-Bit digital audio signal; providing the audio response of a cable without companding 10Hz to 20 kHz bandwidth, with up to 117 dBA dynamic range Microphone Modeling (on the Handheld Transmitter) EQ/Filter Modeling for headset, instrument and lavalier mics (on the Bodypack Transmitter) NOTE: Please do NOT use Stereo (TRS) 1/4" connector/cables with the 1/4" unbalanced Output Jack on the XD-V55. The ring of a stereo cable is used for data transmissions in factory setup and may cause computer-like noise to be coupled into your audio signal if you use a Stereo 1/4" cable. Please use a standard 1/4" MONO cable for the unbalanced Audio Out on the XD-V55 Receiver. Dynamic Filter: engage this feature on the receiver to minimize stage rumble or handling noise. THH12 (Handheld Mic Transmitter) offers four selectable vocal microphone models:  - Shure SM57  - Shure SM58  - Sennheiser e835 [L6] - Line 6 Custom TBP12 (Beltpack Transmitter) offers four selectable EQ/filter models: [FLAT] - No EQ (no roll-off or boost to the signal) [s1] - Microphone EQ (Vocal EQ Setting #1: Low Cut) [s2] - Microphone EQ (Vocal EQ Setting #2: Headworn Lavalier Setting) [iF] - Instrument (20-foot guitar cable High Frequency roll-off) Changing Transmitters from RF2 (Default Mode on XD-V55) to RF1 Mode (for either THH12 Handheld or TBP12 Bodypack): Power on the Transmitter Hold the Select button until the Channel Number flashes Press and hold the On/Mute (Power) button and then quickly press the Select AND Value/Power for Handheld) within one second. Waiting longer than one second may turn off the Transmitter Check the LCD Display; reading should change to RF-1 in place of CH, indicating that the Transmitter is now in RF1, which is what the older XD-V70 and XD-V30 Receivers operate on To revert back to RF2 Mode, repeat the above process in Step #3. The Transmission Mode that is set will be remembered when the Transmitter is powered off. Does USB 3.0 create interference in the 2.4GHz frequency range? USB 3.0 computer cables and peripherals, including hard drives, are known to emit radio frequency interference throughout the 2.4GHz band, which results in reduced range and/or performance for any 2.4GHz device in its proximity (including wireless keyboard or mouse, WiFi, etc.). We recommend placing any digital wireless receivers at least two meters away from the USB 3.0 device and its cabling. Below is a link to a study by Intel regarding this interference. http://www.intel.com/content/www/us/en/io/universal-serial-bus/usb3-frequency-interference-paper.html