User manual AKG HT 4000

[. . . ] FCC Statement This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Parts 74, 15, and 90 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. [. . . ] Push and hold the ON/OFF button (3) until the message "oFF" appears on the display. If you are not sure as to what carrier frequency the transmitter is tuned to, place the transmitter into SILENT mode following steps 1 and 2 below. In SILENT mode, you can check and adjust the carrier frequency and input gain without transmitting a radio signal. Push and hold the jog switch until the display backlighting comes on and the status LED extinguishes. The display will first show the battery capacityin hours and as a bargraph and then the currently selected carrier frequency in MHz. As the backlighting goes out, the display changes as follows: The transmitter is now in SILENT mode and the display shows the Preset menu. You can either select one of the Preset Subchannels from the Preset menu (section 3. The spacing between Preset frequencies prevents any mutual interference. Carrier frequencies are also called "Subchannels" whose numbers are indicated below the "CH" label. The spacing between these frequencies is wide enough to prevent any mutual interference (intermodulation). They save time because you do not need to calculate your own carrier frequencies and help you avoid intermodulation problems. Each Preset has a one or two-character "NAME" relating to the country where the respective carrier frequencies are allocated (e. When designing a multichannel system, make sure to use Subchannels within the same Group only. Using Subchannels of different Presets and/or Groups simultaneously may cause intermodulation. To check which Frequency Group(s) is (are) approved in your country, visit www. If no Preset has been stored in memory, the 2nd line of the display shows "-- -- --". To select the next higher Frequency Group number, turn the jog switch briefly to the right. To select the next lower Frequency Group number, turn the jog switch briefly to the left. Having selected the desired Frequency Group, push the jog switch briefly. To select the next higher Subchannel number, turn the jog switch briefly to the right. To select the next lower Subchannel number, turn the jog switch briefly to the left. This brings up the following screen: 8a If you want to save the selected carrier frequency, push the jog switch briefly. [. . . ] Feedback is the result of part of the sound projected by a speaker being picked up by a microphone, fed to the amplifier, and projected again by the speaker. Above a specific volume or "system gain" setting called the feedback threshold, the signal starts being regenerated indefinitely, making the sound system howl and the sound engineer desperately dive for the master fader to reduce the volume and stop the howling. To increase usable gain before feedback, plasce the main ("FOH") speakers in front of the microphones (along the front edge of the stage). If you use monitor speakers, be sure never to point any microphone directly at the monitors. [. . . ]