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
Power connection
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| 1 2 VDC 45 mA |
IN | OUT |
| Le ft | Tri gg er In put |
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L |
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| Sp e ake rs |
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R |
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| High Current |
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| R igh t | 21K Power Amplifier | |
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BRIDGE Gain L | R |
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| Power |
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| 8 A | ||
(OUT) |
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| SPEAK ERS |
| 120 VAC | |
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| ~ 60 Hz |
Bridge switch must be in OUT postion.
SOURCE | Connect speakers to RED terminals. | + |
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Minimum speaker impedance is six (6) ohms.
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Power connection. Observe correct voltage.
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.
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.
