Krell Industries 403, 402, 302 setup guide Connecting Amplifier, Operating Amplifier

AC POWER GUIDELINES Operate each amplifier from a dedicated AC power line rated at a minimum of 20 amps.

Note

Do not operate the Evolution amplifiers with any device designed to alter or stabilize AC power.

Connecting

the Amplifier

IMPORTANT

Single-ended inputs on the Evolu- tion amplifier are cap-coupled. Use these inputs when connect- ing to a vacuum tube preamplifier.

Pin assignments for the XLR connectors:

Pin 1 Shield (ground)

Pin 2 Non-inverting (0°) (hot)

Pin 3 Inverting (180°) (cold)

Operating

the Amplifier

Notes

When powering up any system, always turn amplifiers on last. When powering down, always turn ampli- fiers off first.

To avoid loudspeaker damage, be sure to switch all sources with the preamplifier level either muted or fully attenuated. Do not change inputs to the amplifier while the amplifier is on.

Krell amplifiers have large reserves of clean power and can safely drive loudspeakers to higher sound pres- sure levels than other amplifiers.

However, use care when setting high playback levels and lower the vol- ume level at any sign of loudspeaker distress.

Follow these steps to connect the amplifier to your system:

1.Turn all power sources and components off before connecting inputs and outputs.

2.Neatly organize the wiring between the amplifier and all system components. Separate AC wires from audio cables to prevent hum or other unwanted noises from being introduced into the system.

3.Connect the Evolution CAST cable(s) from your CAST-enabled preamplifier or source component to the Evolution CAST 4-pin bayonet input(s) (4) on the ampli- fier back panel. For balanced operation, connect the interconnect cable(s) from your preamplifier to the balanced XLR input(s) (6) on the amplifier back panel. For single-ended operation, connect the interconnect cable(s) from your preamplifier to the single-ended input(s) (5) on the amplifier back panel.

Notes

Krell recommends using proprietary Evolution CAST connections for unparalleled sonic performance between the Evolution amplifiers and other CAST-equipped components.

Evolution amplifiers also offer balanced operation. The circuitry and connections associated with balanced operation not only can minimize sonic loss but also are immune to induced noise, especially for installations using long cables.

4.Connect the loudspeaker cables to the loudspeaker binding posts (3) on the amplifier back panel. Loudspeaker binding posts for both stereo and monaural amplifiers only accept spade lugs.

5.Plug the AC power cord into the IEC power connector (9) on the back panel.

6.Plug the other end of the AC power cord into the wall socket.

Evolution amplifiers are easy to operate:

1.Move the back panel power breaker switch (10) to the up position to place the amplifier in the stand-by mode. The power status indicator (2) illuminates in red.

2.Press the silver power button (1) on the amplifier front panel. The power status indicator (2) illuminates in blue. The amplifier is in the operational mode.

Note

The initial power-up phase lasts approximately 30 seconds from the moment the back panel power breaker switch is placed in the up position. If the power button is pressed during this period, the power status indicator flashes blue for the remainder of the initial power-up phase. When the initial power-up phase is complete, the power indicator illuminates in blue and is no longer flashing.The amplifier is in the operational mode.

3.With the preamplifier muted or volume control completely lowered, select a source.

4.Increase the volume control to the desired listening level.

5.To turn the amplifier off, place it in the stand-by mode by pressing the power button on the front panel. The power status indicator turns red, and the amplifier is in the stand-by mode.

It is now safe to turn off the rest of the system.

Powering off

Leave the Evolution amplifiers in the stand-by mode between listening sessions. Turn the amplifier off using the power breaker switch (10), and disconnect the amplifier from AC power when the system is not being used for an extended time period.

	MODEL	SERIAL NUMBER
4 Krell Evolution Amplifiers	Krell Industries, Inc., 45 Connair Road,Orange, CT 06477-3650 USA		P/N 309224
			v 07.1
	TEL 203-298-4000, FAX 203-891-2028, E-MAIL	krell@krellonline.com
	WEB SITE www.krellonline.com