Crown Audio CE Series Front Panel Controls and Indicators, Power Switch, Reset Switch, Fault Jack

CE Series Power Amplifiers

3 Operation

3.3 Front Panel Controls and

Indicators

Power Switch

The power switch turns the amplifier on (“I”) or off (“O”).

Note that dangerous voltages may still be present in the amplifier even when the power switch is in the off (“O”) position. Before moving the amplifier or making any wiring or installation changes, it is important to also discon- nect the power cord from the amplifier or power source.

Reset Switch

The push-button reset switch is used to reset the circuit breaker that protects the power supply.

Fault Indicators

Two red LEDs (one for each channel) are located on the front panel. The Fault Indicators are normally OFF, but will blink under five different conditions:

1. When the amplifier is first powered up, until the unit is ready for operation.

2. If the heatsinks reach a temperature above normal working limits.

3. If the transformer thermal protection circuit is activated.

4. If the amplifier output wires develop a short-cir- cuit.

5. If the amplifier output stage stops operating.

The fault status of the amplifier can also be moni- tored remotely by attaching a signalling device to the Fault jack located on the amplifier back panel.

See Section 4.2.2 in this manual for more informa- tion on fault monitoring and suggestions for signal- ling device circuity.

Some fault conditions may cause the output of the amplifier to be muted.

Clip Indicators

These are two red LEDs (one per channel). The Clip Indicator turns on when distortion is audible in the amplifier output.

Signal Indicators

These are two green LEDs (one per channel). The Signal Indicator illuminates when a signal (> –40 dBm) is present at the INPUT of the amplifier for that channel. Because these indicators receive the signal before the level controls, they can be used to troubleshoot wiring problems within a system. If the Signal indicator for a channel is not lit, no signal is reaching the amplifier on that channel.

Power Indicator

The green Power indicator lights when your CE- Series amp has been turned on and has power.

Level Controls

Two rotary detented Level controls (one for each channel) are are used to adjust each channel’s out- put.

If you wish, the level control knobs may be pulled from the front panel and the holes plugged with the supplied caps to minimize tampering of control set- tings.

3.4Back Panel Controls and Connectors

Input Sensitivity Switch

This two-position Input Sensitivity switch is located near the input connectors. It lets you select between

1.4V input sensitivity or 26 dB gain. Please see Section 2.7 in this manual for details.

Mode Switch

This two-position switch selects either Stereo or Bridge-Mono mode of operation. Stereo mode pro- vides identical power output to each of the two amplifier output channels. Bridge-Mono mode combines the two amplifier output channels into a single mono channel with twice the voltage of a sin- gle stereo channel.

Do NOT select Bridge-Mono mode without first making sure the amplifier has been wired in a Bridge-Mono configuration. For more information on wiring for Bridge-Mono mode, see Section 2.6.2.

Fault Jack

This is an RJ-11 jack (which looks like a telephone jack). By attaching a signaling device to the Fault jack, you can monitor the amplifier’s Fault status from a remote location. See Section 4.2.2 for more information on fault monitoring.

Barrier Block Inputs

For each channel, this row of screw terminals pro- vides a balanced input, which is in parallel with the channel’s Combo input connector.

Neutrik Combo Input

One per channel, this combination 1/4-inch phone jack and XLR connector provides a balanced or unbalanced input.

Neutrik Speakon® Output

One per channel, this Neutrik Speakon® connector with four terminals connects to loudspeakers.

page 14 Operation Manual