Harman Kardon A250 Owners Manual - Page 8
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Lead Dress: A black plastic clamp is located on the rear of the chassis near the input receptacles. Remove the rubber clamp on the upper portion of the block, insert the shielded leads into the clamp assembly and replace the rubber clamp. This will offer a neat installation. OPERATING THE MODEL A-250 AS A MONAURAL AMPLIFIER The Model A-250 incorporates the folloWing front panel controls. Viewing the instrument from left to right you will note a TREBLE control (on/off switch is incorporated in this control), BASS control, LOUDNESS control, BALANCE control, MODE switch and FUNCTION switch. On the upper left section of the front panel you will note two SPEAKER SELECTOR switches and a CONTOUR switch. On the upper right there is a RUMBLE FILTER switch, a SCRATCH FILTER switch and an EQUALIZATION switch. TECHNICAL EXPLANATION OF THE CONTROLS - Bass and Treble: These controls provide the full range of tonal adjustment necessary for high fidelity listening. These controls can either boost or cut the bass and treble tones of your monaural system. The controls should be set in accordance with your listening preference, speaker characteristics and room acoustics. Loudness Control: This control adjusts the volume level of any program material fed into your high fidelity system. Its effect can be modified by the CONTOUR switch. Contour Switch: One of the limitations of human hearing is its tendency to lose sensitivity to the very low pitched sounds, as the program sound level is reduced. It is this characteristic (known as the Fletcher-Munson effect) which causes one to play music programs at high listening level in order to experience the full rich tone available from fine modern recordings. The Harman-Kardon CONTOUR switch compensates for the Fletcher-Munson effect, thus eliminating high listening levels as a requisite for full enjoyment of reproduced music. For low level listening throw the CONTOUR switch located on the front panel to either number 1 or number 2 position, depending on your listening preference. You will note how the low frequencies become more apparent while the volume level remains unchanged. Balance Control: This control has no function in monaural listening and should be left in the center position. If rotated to either extreme position, it would completely shut off the preamplifier on that side. Mode Switch: The only application for this switch in monaural operation is to select between the two preamplifiers. This allows for double the usual number of input jacks found on ordinary monaural amplifiers. The STEREO NORMAL and MONAURAL RIGHT positions are identically connected and will activate the Right preamplifier, therefore switching on all program material connected to this preamplifier. STEREO REVERSE and MONAURAL LEFT are identically connected and will activate the Left preamplifier. For simplicity, it is suggested to use only the MONAURAL RIGHT and MONAURAL LEFT positions on the MODE switch for monaural operation. Switch to MONAURAL RIGHT or MONAURAL LEFT as a function of the preamplifier you wish to use. Function Switch: The FUNCTION switch selects the desired type of program source and has five positions: AUX 1 and AUX 2 selects equipment connected to the