Crown Audio K Series Front Panel Controls and Indicators, A. Level Controls, B. Indicators, page

K Series Power Amplifiers

4 Operation

4.2 Front Panel Controls and

Indicators

Figure 4.1 below points out the controls, indi- cators and connectors on the front panel of the K Series amplifiers. The K1 and K2 look identi- cal except for product nameplates and fuse specifications.

A. Level Controls

The Level controls, one per channel, adjust the input attenuation from 0 dB to 100 dB.

B. Indicators

Figure 4.2 shows a close-up view of the indica- tor LEDs (4 per channel).

TLC: The TLC (thermal level control) indicators turn on with a dim glow a little before the amplifier needs help dissipating heat. This forewarning gives you a chance to turn on a fan or other auxiliary cooling (if available), or turn down the level controls of the amplifier. If you do neither, the amplifier will automatically

begin to protect itself with its TLC protection system by subtly and dynamically reducing the gain as needed. The TLC indicators gradually turn brighter as the TLC protection becomes greater.

Clip: Turns on when distortion becomes audi- ble in the amplifier output.

IOC: The yellow Input /Output Comparator indicators turn on when distortion reaches 0.05%, which is well before the distortion is audible.

Signal: The green Signal indicators flash dimly when a very low-level signal (as low as 10 mW) is present in the output. They flash brightly when a louder signal (at least 1 watt) is present at the output.

C. Enable Indicator

The green Enable indicator turns on when the amplifier has been turned on and has power. When first turned on, there will be a

2-second delay while the amplifier performs a

quick start-up test. Then the Enable indicator will turn on to its full brightness. If no signal is present, the Enable indicator will switch to a dimmer green.

D.Power Switch

Amplifier is on when the top half of the switch is depressed.

Figure 4.2 Front Panel Indicators

Figure 4.1 Front and Back Panel Controls, Indicators and Connectors

Operation Manual page 11