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When installing, make sure the 21k front panel power switch is
in the out or “OFF” position. Plug the DC adapter into a switched
outlet on the source device that will be activated when you want
to have the amplifier turn on. This may be the switched outlet at
the rear of an AC receiver or other audio equipment. Connect
the 3.5mm mini-plug from the adapter to the trigger-input jack
on the back panel of the amplifier. The amplifier now turns on
and off automatically, based on the status of the controlling
device.
Power connection
Once all audio system connections have been made, connect the
supplied power cord to the amplifier first, and then connect it to
an AC power source. Please make certain that the amplifier is
turned off and that the device connected to the remote trigger
input is off when connecting the power cord and plugging it into
an AC outlet.
Amplifier operation
After all connections have been made you are ready for
operation. First, turn on the source component in your system.
It is always a good idea to turn on your amplifier LAST.
This avoids the possibility of any turn on pops or transients from
other equipment being amplified and sent to your speakers
where they may cause damage. Always start with a low volume
level on your computer or preamp to avoid damage to your
speakers.
21k Manual on
Press the 21k front power switch to the “on” position. There will
be a short pause from the time the power is turned on until
power is applied to the speakers. This is intentional and protects
your speakers from damage while the amplifier stabilizes. The
red protect lamp will glow and when the amp is ready a blue
light will switch on. To turn the unit off, press the power button
again (out position). The amp will turn off in a few seconds.
Gain
L R
L
R
IN OUT
Left
Right
Bridge switch must be in OUT postion.
Connect speakers to RED terminals.
Minimum speaker impedance is
six (6) ohms.
Power
connection.
Observe
correct
voltage.
Speakers
21K
High Current
Power Amplifier
Power
8 A
120 VAC
~ 60 Hz
2-16 OHM
SPEAKERS
BRIDGE
(OUT)
-
+
+
-
SOURCE
12 VDC 45 mA
Trigger Input
Bridge Mode
The 21K can be put into the mono bridge mode to increase the
power output.
To do this, first make sure the 21K is powered down or off.
Speaker damage could occur if it is powered up.
Connect the source RCA jack to the left input. The left RCA
source output can be sent to another amplifier input.
Make sure the bridge switch is in the out position.
Connect the speaker (minimum 6 ohms) to the two red speaker
terminals on the 21K. The left red terminal on the 21K is
connected to the speaker positive (+) input. The black 21K
speaker terminals are not connected in the bridge mode.
Turn the Left gain on the 21k all the way down (counter
clockwise).
Turn the source on and the power to the 21k and adjust the Left
gain as desired.
Enjoy.