Harman Kardon CITATION 7.3 Owners Manual - Page 10
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Connections to the speakers from an amplifier may be made using bare wire, banana plugs or spade lugs. If bare wire is used for the connections, strip approximately 1 /2 inch to 3/4 inch (20mm) of insulation from the end of each wire and carefully twist the strands of each conductor together. Be careful not to cut the individual strands or twist them off; for optimal performance all strands must be used. Before connecting the wires to the speaker, note that the terminals have black and red colored rings on the gold-plated binding posts. These colored rings are your keys to maintaining correct phasing with the amplifier and processor. Loosen the speaker binding posts far enough so that the pass-through hole is revealed. Note that one conductor of the speaker cable will have no markings, and the other will have a red line, brand name markings, a colored thread, or some other positive indication. Place the wire with the "+" sign, thread or markings through the hole in the terminal with the red colored ring. This is the "positive" conductor. Place the wire with no markings, or a "-" sign through the terminal with the black colored ring. This will be the "negative" conductor. Twist the binding posts back so that a positive connection is made, but do not overtighten or use tools, as this may break the delicate wire strands and decrease system performance. If you are using spade lugs, connect them to the wire using the manufacturer's instructions, and then loosen the caps on the binding posts. Place lugs between the screw terminal and the back of the binding post, as if it were a horseshoe on the game's post. Be sure to observe proper polarity, by placing the "-" or blank wire to the black post, and the "+" or marked conductor to the red post. Tighten with your fingers to obtain a positive contact. Banana plugs may simply be inserted into the jack provided on the speaker terminal connection. Before inserting the plugs, make certain that the binding post's screw cap is tightened down by turning it in a clockwise direction. This makes certain that the maximum contact area is available. Also, be certain that the plugs are firmly inserted so that a proper connection is made. Finally, run the cables to the amplifier, and connect the cables using the instructions provided by the amplifier's manufacturer. It is highly recommended that the length of cable connecting any two pairs of speakers be identical. For example, make certain that the cable length connecting left and right front, or left and right rear (surround) speakers are identical, even though one speaker may be physically closer to the amplifier than the other. When making connections at the amplifier end, be certain to observe proper polarity, connecting the "black" wire to the negative terminal and the "red" wire to the positive terminal. If one speaker has excess wire in its lead to maintain equal length, make certain the extra cable is NOT coiled in a circle, as this may create an artificial inductor that will affect the frequency response of the system.