45 Connair Drive
Orange, CT 06477-0533, USA
KMA-160 OWNER, S MANUAL: INSTALLATION & OPERATION INSTRUCTIONS
JUNE. !,.. 19.89
GENERAL INFORMATION
Thank you for purchasing the KMA-160 Monaural Amplifiers. The
KMA-i60 represents the absolute latest evolution in amplifier technology and has many innovative design features. It is one of four
amplifiers in the new KRELL Programmable Series, the features of which are are discussed below. There are several aspects of its operation that require your special attention and understanding
before installation is begun. Also, this document contains much general information concerning audio system installation in addition to specifics of the KMA-160.
PURE CLASS A OPERATION AND POWER CONSIDERATIONS
The KMA-160 is rated as delivering 160 watts of Class A power into 8 ohms. One inherent aspect of Class A operation is the need for a large amount of current from the AC mains. The amplifier at idle draws 8 amps. However, the Class A rating does not completely reveal the true, overall power of the KMA-160, both in terms of output power or AC power consumption. The amplifiers' maximum output into 8 ohms is 240 watts per channel.
That every KRELL product uses Class A circuitry in all gain and
supply stages is a foundation of our design philosophy. A second design commitment that relates to amplifiers is that every unit be capable of doubling its output into successively lower impedances.
The KMA-160 will deliver 320 watts per channel into 4 ohms; 640 watts per channel into 2 ohms and 1280 watts per channel into i ohm. And there is headroom over these figures! It is capable of driving impedances below I ohm. Use below i ohm requires adjustment of the Programmable Low Impedance Limit Set circuit on the Protection Board. This adjustment is performed by the dealer or distributor.
Given the above, the AC power supplied to the amplifier is crucial to getting maximum performance. The KMA-160 pair should have a dedicated 20 amp line.
