Front Panel Diagram; Speaker Connection - Alto APX2000 Quick Start Manual

FRONT PANEL DIAGRAM

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1. POWER SWITCH – Turns the amplifier on/off.
2. POWER LED – Illuminates when the amplifier is on.
3. LED METERS – Indicates the audio signal level.
20 dB.
4. CLIP – The red "Clip" light indicates the signal is distorting or "clipping," which occurs when the volume
exceeds the amplifier's maximum output.
Consistent clipping can damage your amplifier and speakers. If the signal is regularly clipping, reduce the
volume of the amplifier. If it is lit about half the time, the amplifier channel's thermal protection will cause the
channel to shut down within a few minutes.
5. PROT – The red "Prot" light indicates the output for that channel has turned off to protect your amplifier and
speakers, which can be damaged by excessive volume resulting in clipping. If the meters' red lights are
illuminating, decrease the levels of your CHANNEL GAIN knobs.
6. CHANNEL GAIN – This knob controls the channel's output signal.
7. COOLING VENTS – These vents help to cool the internal parts of the amplifier when in use. Do not block
these vents, and keep the vents clean at all times.

SPEAKER CONNECTION

WARNING!:
• Do not make any connections when any device is powered on.
• Do not allow the wires from terminals to come in contact with each other.
• Do not connect either positive (red) output to chassis ground.
SHORT CIRCUIT PROTECTION
Output short circuit protection protects the output devices of the amplifier from short circuits and stressful loads. If
your speaker lines short, the amplifier automatically detects this problem and discontinues operation for that channel.
(If one channel's short circuit protection is activated, the other channel will continue to operate normally.) During short
circuit protection, the "Clip" and "Protect" LEDs will light simultaneously, and all output from that channel will stop.
Short Circuit Protection can often be traced back to the signal output line (i.e., the speaker line). Check the line from
the output terminal of the amplifier to the speaker. If this line is still good, check the internal speaker connections and
components. (A short circuit can often be traced to a bad cable or a bad speaker component and is rarely traced to
the amplifier itself.)
Bare Wire Connections:
When connecting your speakers to the amplifier using bare wires, follow these
steps:
Unscrew the red and black caps of the binding posts. (Be sure not to
1.
completely remove or unscrew the red and black caps.)
Strip back the wire insulation 1/2" (13mm).
2.
Insert the bare wire into the hole exposed under the binding post cap.
3.
After inserting the wire, screw the binding post cap down on the wire.
4.
Spade Connector:
When connecting your speakers to the amplifier using spade connectors, follow these steps:
Unscrew the red and black caps of the binding posts. (Be sure not to completely remove or
1.
unscrew the red and black caps.)
Insert the spade connectors into the binding posts.
2.
Tighten the caps down on the spade connectors.
3.
Banana Connectors:
When connecting your speakers to the amplifier using banana connectors, follow these steps:
Be sure that the red and black caps of the binding posts are tightened completely.
1.
Insert the banana connectors into the caps of the binding posts. Be sure that the connectors are inserted
2.
securely.
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This LED will light up when the signal at the output is at least -
This LED will flash when distortion reaches a level of 0.5%.
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