PAC Audio TR-4
PAC Audio TR-4
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PAC Audio TR-4
The PAC Audio TR-4 is a low voltage trigger module that adds a remote turn-on signal for an aftermarket amplifier on a motorcycle audio install. It can be triggered from speaker leads or a +5 V remote wire.
Remote turn-on when the radio has no remote lead
The TR-4 senses a low trigger voltage and switches a 12 V output to wake an aftermarket amplifier.
- Senses trigger voltages as low as 0.8 V
- 12 V output
- About 1-second turn-on delay
Key Product Details
| Product | PAC Audio TR-4 low voltage trigger module |
| Function | Adds remote turn-on for an aftermarket amplifier |
| Trigger inputs | Speaker leads or +5 V remote wires |
| Minimum trigger voltage | 0.8 V |
| Output | 12 V |
| Turn-on delay | 1 second |
| Turn-on pop | Eliminates turn-on pop |
Specifications match the PAC Audio catalog listing for the TR-4.
When a Trigger Module Is Needed
Many factory and aftermarket radios on a motorcycle have no dedicated remote turn-on lead for an amplifier. The TR-4 solves that by reading a signal from the speaker leads or a +5 V remote wire and sending a 12 V turn-on signal to the amplifier.
Because it delays turn-on by about one second, it also removes the turn-on pop that aftermarket amplifiers can produce.
Related Paths
PAC Audio TR-4 FAQ
What does the PAC Audio TR-4 do?
It adds a remote turn-on signal for an aftermarket amplifier, which is useful when the radio has no dedicated remote turn-on lead.
What can trigger the TR-4?
It can be triggered from speaker leads or from +5 V remote wires, and it senses trigger voltages as low as 0.8 V.
What output does it provide?
It provides a 12 V output with a turn-on delay of about 1 second.
Does it help with turn-on pop?
Yes. PAC lists turn-on pop elimination as a feature of the TR-4.
Will it work with my bike?
Send us your bike, model year and radio and we will confirm the wiring approach before you order.
Need Help Choosing?
Tell us your bike, model year and what you want to add, and we will confirm fitment and the right parts before you order.