Whelen Air Horn - Popping Noises

Lunixor

New Member
Hi all,

I recently acquired a Whelen PAP112 Air Horn & PA Amplifier that I've installed in my vehicle. Unfortunately, I've noticed a couple issues that I can't seem to figure out a cause for.

Whenever the PAP112 unit turns on or off (via key ignition power), a loud 'pop' noise can be heard from the speaker. It is very noticeable and somewhat annoying. The air horn itself functions fine.

Similar thing occurs when keying the microphone - an audible popping noise both at the start and end of push-to-talk. I've noticed that when the mic is plugged directly into the unit it's not as much of a problem, but when using the 10' extension cable (from trunk to cabin) the noise is much more audible.

From what I can find online, these are generally not normal noises for most siren amplifiers. Is there something wrong with my PAP112 unit? It is the older model and I would guess it is 10-20 years old if that plays in as a factor.
 

Jennifer Rose Towing

Established Member
A previous Whelen siren I had would give that same tick, clap or pop when turning on or off. The off noise was a bit quieter then when switching on. I never thought twice of it, thought it was normal. The siren was a 295 something. Keying the mike gave a light noise too but much much quieter then the power switch.
 
OP
OP
L

Lunixor

New Member
I have the unit grounded to the chassis behind the passenger kick panel, so I'm not sure if grounding would be the issue
 

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