Krell Industries KAV 3250 - Manual (Page 19)

10 Krell KAV–2250 and KAV–3250
Back Panel Description, continued
Fuses
10 AGC-12 Fuses
The AGC-12 Amp loudspeaker fuses protect the amplifier against short circuits at the
amplifier outputs.
Back Panel Remote Connections
11 12 VDC Remote Power Out
The amplifier is equipped with an output that sends 12 VDC power on/off
(12 V trigger) signals to other Krell components and other devices that incorporate
a 12 V trigger.
12 12 VDC Remote Power In
The amplifier is equipped with an input that receives 12 VDC power on/off (12 V trigger)
signals from other Krell components and other devices that incorporate a 12 V trigger.
This allows you to turn the amplifier on and off using a Krell or other component in a
custom installation.
Notes
When the component is in the operational mode, the 12 VDC Out provides 12 V of DC
output. When the component is in the stand-by mode or off, the DC output is 0 V.
12 VDC Out (12 V trigger) current is limited to 30 mA.
Consult the owner’s manual of each component used in a custom installation to take full
advantage of the amplifier’s remote capability.
Power
13 IEC Power Connector
The amplifier is equipped with a standard female IEC power connector, for use with the
provided AC power cord.
14 Back Panel Power Switch
Use this switch to turn the amplifier from off to the stand-by mode.
Krell KAV–2250 and KAV–3250 15
Reconfiguration Options for the KAV–2250
and KAV–3250
There are a number of options for reconfiguring the amplifier output:
Multi Amp Throughput (MAT) is an internal connection option for the amplifier that lets
you send the same music signal to all amplifier channels using one balanced or single-
ended connection. MAT reduces installation complexity and cabling requirements in
systems containing multiple amplifiers.
Bridging allows you to reconfigure two channels to operate as one combined amplifier
channel. The bridged amplifier channels deliver 1,000 Watts into an 8 Ohm load. The
remaining unbridged amplifier channel on the KAV–3250 can be connected to a
separate loudspeaker.
To reconfigure the amplifier for MAT or for bridged operation you need to remove the
top cover of the amplifier and access the input switch banks.
IMPORTANT
Removing the cover of the amplifier to reconfigure for MAT or for bridged operation is
the ONLY instance you are authorized to remove the cover of ANY Krell component
without voiding your Warranty. For more information on product limitations and
restrictions, see Warranty, on page 24.
TO SAFELY ACCESS THE INPUT SWITCH BANKS
Before reconfiguring the amplifier, please read the following important instructions to
safely remove the amplifier cover and access the input switch banks to reconfigure the
KAV–2250 or KAV–3250.
Tool needed: T-15 Torx wrench
1. Unplug the AC power cord from AC power.
2. Krell suggests removing jewelry before reconfiguring your amplifier. Rings,
necklaces, bracelets, and other metal jewelry can conduct an electrical charge.
3. Using the T-15 Torx wrench, remove the 12 screws that secure the amplifier cover.
4. Carefully remove the cover.
5. Locate the green input circuit board, which has white input switches and red input
switch banks, at the rear of the amplifier