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.
Telephone: (203) 799-9954 / FAX: (203) 799-9796
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