Krell kma 160 owners manual
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Extracted text from krell kma 160 owners manual (Ocr-read)
Page 1
Amplifiers dissipate much of the power they consume in heat. The KMA-160 should be installed in a location that provides unobstructed ventilation. If you have to install the units on shelves or in a cabinet, extra ventilation might be necessary. This can be easily done with fans in a variety of ways. Generally, with the front and rear open, 2 - 3 inches clearance each side and 8 inches above the amplifier, ventilation will be adequate. The dimensions of the KMA-160 are: 23" wide x 22" deep x 9 high. The units weigh 80 pounds each; shipping weight is i00 pounds each. INPUT CONNECTIONS The KMA-160 has bo~h balanced and single-ended inputs. The balanced input uses the 3-pin XLR connector and the single-ended input uses the RCA connector. The pin assignment for the XLR's is: pin 1 = signal ground; pin 2 = non-inverting input; pin 3 = inverting input. The RCA connector is wired in parallel with pin 2, the non-inverted input. Only one of these inputs should be connected to a preamplifier. The input that is not connected to the preamplifier can be used as an output to a second amplifier for power-biamp applications. Before proceeding with such an installation you should consult your Dealer or the factory. INSTALLATION After inspection of the amplifiers for any shipping damage they are ready for instaila~ion. The wiring to and from the amplifiers, and all components in general, should be arranged in a neat, organized manner. Specifically, AC wires should be separated from audio wires. This avoids hum or other unwanted noise from being induced into the system. The KMA-160 has four sets of five-way binding post speaker connectors. These are wired in parallel and have identical function. It is always preferable to run long interconnect cables to the amplifiers and keep speaker cable length to a minimum. Speaker cable does add impedance between the amplifiers, regardless of its guage. All KRELL amplifiers will drive the lowest impedances with ease. When impedance is added in any significant amount, amplifier power is literally wasted in driving the cable, thereby reducing the maximum power that can be delivered to the speaker. The feet on the KMA-160 can be used two different ways. They are made from machined aluminum and are supplied with separate rubber bottoms and mounting screws. The rubber bottoms can be screwed into the the feet for protection of fragile surfaces such as hardwood floors or furniture. For use on rugs we recommend using the feet without the rubber bottoms.
Page 2
PROTECTION CIRCUITRY The KMA-160 has a sophisticated series of circuits that protect it from dangerous input signals or loads on the output. They also analyze various amplifier functions to prevent speaker damage caused if the amp should fail. When the protection circuit is engaged, the amplifier will stop functioning. The on/off switch will remain illuminated and in the on position. Switch it to the off position. After resolving either the input or output problem and leaving the unit off for a short time, it can be turned on. The minimum cycle time for the protection circuit is i0 seconds. Important: if the amplifier does not come on following this procedure, contact your dealer. WARRANTY/SERVICE I~;FORMATION There are no fuses or user-serviceable parts in the KMA-160. The warranty on the KMA-160 is 5 years for parts and labor, and includes return freight. Returns can be handled either through a dealer or by direct contact with the factory. Please do not return any unit to Krell for repair without first calling to discuss the problem, and to obtain a Return Aur_horization number if the unit must be repaired.