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Connecting the KAV-250a or KAV-250a/3
Amplifier to Your System
INPUT
AND OUTPUT CONNECTIONS
The following steps describe how to connect cables to the KAV-250a or KAV-250a/3
amplifier.
1. Neatly arrange and organize the wiring to and from the amplifier and all
components. Separate AC wires from audio cables to prevent hum or other
unwanted noise from being introduced into the system.
21 Connect the loudspeaker cables to the KAV-250a amplifier channel output speaker
binding posts (7, 8), or the KAV-250a/3 amplifier channel output speaker binding
posts (22, 23, 24) located on their respective back panels.
The amplifier channel outputs for the KAV-250a and KAV-250a/3 use five-way
loudspeaker binding posts. The loudspeaker binding post terminals accept spade
lugs, bare wire, banana plugs, or pins. Use the red terminal for the positive
connection and the black terminal for the negative connection.
3. Connect the interconnect cables from your output device to the amplifier inputs. The
KAV-250a is equipped with balanced (3, 4) or single-ended (5, 6) inputs and
KAV-250a/3 is equipped with balanced (16, 17, 18) or single-ended (19, 20,
inputs located on their respective back panels. The balanced inputs use three-pin
XLR connectors; the single-ended inputs use RCA connectors.
4. Insert the end of the AC power cord into the IEC power connector on the KAV-250a
(13) or KAV-250a/3 (29) back panel. Insert the other end into the AC wall outlet.
The amplifier is now ready for operation. See Amplifier Operation, on page 25.
The KAV-250a or KAV-250a/3 amplifier is shipped with shorting pins in the XLR
inputs. These pins should remain in the XLR inputs if the amplifier is operating in the
single-ended mode. When the shorting pin is inserted, pins 1 and 3 are shorted
together. Remove the shorting pins to connect the amplifier for balanced operation.
The XLR pin configuration is described below:
Pin 1
Ground
Pin 2
Non-inverting (0
°)
Pin 3
Inverting (180
°)
Krell recommends using balanced interconnect cables. Balanced interconnect cables
not only can minimize sonic loss but are also immune to induced noise, especially with
installations using long cables. Balanced connections have 6 dB more gain than single-
ended connections. When level matching is critical,
keep this gain value in mind.
14
KAV-250a and KAV-250aJ3 Amplifiers
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