User manual AKG HEARO 787 SURROUND

[. . . ] Never place the equipment near heat sources such as radiators or electric heaters, or expose it to direct sunlight, excessive dust, humidity, rain, vibrations, or impacts. Never use alcohol, petroleum-based cleaners, or paint thinners to clean the headphone or transmitter case. If you do not use your transmitter for an extended period of time (e. , when traveling), disconnect the AC adapter from the AC outlet. [. . . ] If you switch the transmitter off and back on later, the backlighting will come on again, even if you switched the backlighting off. FREQ: Steps through three fixed carrier frequencies within the frequency band of your headphones system. LEVEL: As long as audio signal is present at the transmitter input, the green LEVEL label will flicker in step with the signal level. Since signal levels are controlled automatically, the transmitter has no input gain knob. When you place the headphones in the receptacles, the batteries inside the headphones will be charged automatically. CHARGE: This label indicates the charging function status: The CHARGE label illuminates to indicate the batteries inside the headphones are being charged. Since the charging circuitry operates independently from the rest of the transmitter circuitry, the CHARGE label will light even if the transmitter is OFF. The CHARGE label will remain dark when no current flows from the transmitter through the charging contacts to the batteries inside the headphones (transmitter is not connected to power, no headphones resting on the transmitter, no batteries inside the headphones, batteries inserted incorrectly, contaminated charging contacts). You can connect the transmitter either to a mini or 1/4" headphone jack or LINE OUT or REC OUT RCA jacks. Before connecting the transmitter to your audio source, switch the audio source OFF. Plug the red RCA connector (right channel) on the supplied jack cable into the red AUDIO IN R socket (13) and the white RCA connector (left channel) into the white AUDIO IN L socket (13) on the transmitter rear panel. If the headphones output on your equipment is a 1/4" jack, plug the supplied mini jack to 1/4" adapter jack onto the jack cable. Plug the white RCA connector (left channel) on the jack cable into the white LINE OUT L or REC OUT L socket on your audio source and the red RCA connector (right channel) into the red LINE OUT R or REC OUT R socket. O Alternatively, you can use a standard stereo RCA cable. These cables are available at hi-fi or electronic supply stores. Never connect two audio sources simultaneously to the transmitter inputs. Playing back two audio signals at the same time may cause severe distortion. Check that the AC voltage stated on the supplied AC adapter is identical to the AC voltage available where you will use your system. Using the AC adapter with a different AC voltage may cause damage to the unit. For physical reasons that are not related to the quality of the product, extremely strong interference sources may affect reception. In order to maintain interference-free listening pleasure, do not operate your HEARO 787 SURROUND in the close vicinity of radio equipment, cellular telephones, or directly above TV or computer monitor picture tubes. The supplied connecting cables are long enough to allow the transmitter to be placed at a safe distance from interference sources. [. . . ] ) The label backlighting will come on every time you switch the transmitter on even if you switched the backlighting off before. If there is audio signal present at the transmitter input, the LEVEL label (10) will flicker in step with the signal. After a few seconds, you should hear the signal in the headphones clearly and free of interference. If your first try fails, press the FREQ key (8) on the transmitter front panel to select a different carrier frequency and press AUTOTUNING (4) again. [. . . ]