Overview:

 The PSB-1 automatically enters standby mode after an extended period without detecting a valid audio signal.  When a qualifying signal is present, the amplifier will remain active or wake from standby as needed.

Sleep Mode Behavior:

The PSB-1 uses the same signal detection criteria for both waking from standby and preventing standby.

If the amplifier detects a valid signal, it will either:

• Wake from standby if currently asleep, or
• Reset the standby timer if already active

A valid signal is defined as:

• Audio content between 20 Hz and 20 kHz
• A signal level of -21 dBu or greater

There are no separate sensitivity thresholds for these functions.

Signal Duration Requirements:

The signal only needs to be present briefly to be recognized as activity.  In most applications, a signal lasting 2 to 5 seconds is sufficient to reliably reset the standby timer.

Using a Pilot Tone:

Installed systems may use a high-frequency pilot tone to keep the PSB-1 active during periods of inactivity.

For best results:

• Use a tone between 19 kHz and 20 kHz
• Ensure the signal arriving at the PSB-1 is at least -21 dBu
• Transmit the tone periodically before the standby timeout period expires
• Use a tone duration of approximately 2 to 5 seconds

When these conditions are met, the amplifier should remain awake rather than entering standby.

Frequently Asked Questions:

Troubleshooting Unexpected Standby Events:

If the PSB-1 enters standby when it should remain active:

• Verify the signal level at the amplifier input is at least -21 dBu.
• Confirm any pilot tone or audio signal falls within the detectable frequency range.
• Check DSP, routing, and gain settings that may reduce the signal level before it reaches the PSB-1.
• Increase the pilot-tone duration to 2 to 5 seconds if shorter bursts are being used.