Audison ASP Signal Presence Module for Prima AP8.9bit AP5.9bit AP4.9bit DSP Amps

The Audison ASP is a signal presence module compatible with the Audison Prima AP8.9bit, AP5.9bit, and AP4.9bit DSP amplifiers. It simulates a temporary resistive speaker load at start-up so OEM head units keep their outputs active during factory-integrated installations.

Key specifications

• Compatible amplifiers: Audison Prima AP8.9bit, AP5.9bit, AP4.9bit
• Function: temporary resistive load at amplifier start-up
• Load: removed automatically once the source unit is satisfied
• Benefit: no constant heat or strain on the head unit, unlike fixed resistors

ASP Signal Presence: what it does

Some OEM head units require a resistive load at their outputs on start-up to confirm speakers are present. If no load is detected, the source cuts the outputs — typically the rear channels — which prevents you from setting input levels during calibration. The ASP module solves this when fitting the AP8.9bit, AP5.9bit, or AP4.9bit in a factory-integrated system.

The ASP simulates a temporary load when the amplifier powers on. Once the source is satisfied, the load is automatically removed. No signal is lost and no manual workaround is needed.

Why not just use resistors?

Fixed power resistors wired to the source outputs would do a similar job, but they stay connected permanently. This generates heat continuously and puts unnecessary strain on the head unit. The ASP removes itself from the circuit after start-up, so there is no ongoing load and no wasted heat.