Harman Kardon HK6900 Owners Manual - Page 4

HK6800/6900 Front Panel Controls HK6900 I n tegra t ed Amp ha rma n/ka rdon I e, SPEAKERS Clr VCR, TAPE MONITOR Source RECORD OUT Olt u1 Copy FUNCTION rune, VOLUME PMse-Ccaoof Po Pro. NeaopOones an Deed laxness Subs., rcne Cad. aass r, me Balance Eden SeacL,g I I Coardge 0 ©0 • 0 POWER switch The POWER switch turns the unit on and off. In North American and Japanese versions, this switch also controls power to the SWITCHED outlets on the back of the unit. When the power to the unit is off, the switched outlets are also turned off. 0 PROTECT light This light indicates that the protection circuitry of your amplifier is engaged. The light will come on under two circumstances: • When you turn the unit on. As the unit prepares itself for operation, a muting circuit temporarily prevents pops or other noise from reaching your speakers. When the unit is ready for operation (in approximately 10 seconds), the light will go off. • When the unit detects a problem. This light will come on if your speakers wires are touching, causing a short circuit, or if your amplifier overheats. In the case of overheating, a thermal sensor will shut down the unit before damage can occur. Depending on the cause and extent of the overheating, the unit may take some time to cool down, and the protection circuit will remain in operation until the unit is cool enough to operate safely. In the case of a short circuit in the speaker wires, the protection circuitry will attempt to reset itself every 10 seconds, and you may hear a slight click as it does so. The protection circuit will remain in operation until the condition is corrected. ©HEADPHONE jack Stereo headphones with a standard 1/4" plug can be connected to this jack. You can listen to headphones regardless of whether your speakers are playing. To listen to headphones only, turn the speaker selector to "OPE" 0 MAIN DIRECT When the MAIN DIRECT switch is on, the source signal goes directly to the input of the amplifier, bypassing all tone controls and other preamplifier circuitry and is attenuated only by the volume control. The indicator light will be lit when the MAIN DIRECT switch is on. 0 PHASE-CORRECT LOUDNESS At low volume levels, your ear is less sensitive to very low bass frequencies than it is at normal listening levels. The loudness button provides a special equalization curve that boosts low frequencies. The loudness button is useful for restoring full frequency balance at low volume levels, and can also be used to improve the bass response of small bookshelf speakers. The indicator light will be lit when PHASE CORRECT LOUDNESS is on. 0 SUBSONIC filter Warped records and turntable resonance can generate sub-audible frequencies that can cause your speaker's woofer cones to visibly flutter. This very low frequency noise, while inaudible, can rob power from your amplifier, can cause feedback through your turntable, can cause intermodulation distortion at audible frequencies, and can actually damage your woofers if the movement is violent 3