Krell Industries Monaural Amplifiers KMA-160 Manuale utente

45 ConnairDrive

Orange, CT06477-0533, 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 -

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.

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.

Once the amplifiers are in place and turned off, connect the speaker

and interconnect cables. The preamplifier should be on at this point,

with level fully attenuated; all other sources should be off. Connect

the AC last.

OPERATION

When turning on the system, the amplifiers should always be last.

The KMA-160 on/off switch is actually a circuit breaker that is

involved in several protection circuits. Upon turn-on the amplifiers’

outputs are not connected to the speaker. After the protection

circuits have determined that the unit has completely stabilized, the

speaker relays will be engaged. You will hear a click when at this

point. The amplifiers are now ready to use. The amplifiers will be at

temperature and sound their best after approximately 15 minutes.

Operating the amplifiers is, obviously, very easy. Equally important

is an understanding of the care that should be exercised when

operating the system as a whole, in relation to the enormous power

output of the KMA-160. Simple mistakes, such as switching between

active sources without muting the preamplifier output, or

bumping/miscuing a cartridge, can generate large transients at low

frequencies. With this type of transient the KMA-160 can generate

enough power to damage most loudspeakers. All switching of sources

should be done with the preamplifier level either muted or fully

attenuated. Also, the inputs to the amplifiers should not be changed

while they are on.

Care must be taken when setting high playback levels. Because of

their tremendous reserve of clean power, KRELL amplifiers safely

drive speakers to higher sound pressure levels than other amplifiers.

This also means driving them to their limit. Always turn the level

down at the first sign of distortion.

When turning the system off, the amplifiers should be first. This

avoids the possibility of a turn-off transient from some other

component getting to the speakers.

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