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.
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.