[Ranger 98] Speakers "PUP" sound on power on HU - Ranger-Forums - The Ultimate Ford Ranger Resource


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Old 04-27-2016
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Icon5 [Ranger 98] Speakers "PUP" sound on power on HU

Hello all,
Recently i've purchased a Ranger 98 and it has the original factory installed CD/radio unit. It's stock and nothing special but i plan to change it in the future.
I noticed this annoying PUP sound in all speakers when i power on the HU. Anyone familiar with this type of issue, any guidelines to start troubleshooting this?

Thanks in advance
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Old 04-27-2016
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Not uncommon in older audio systems, car or home.

Couple of reasons, none that would be worth fixing since it is too cheap to replace the unit.
Coupling-capacitors are often used on the power supply for the pre-amp and amp, if either fail DC voltage builds up and "pops", once powered up all is well.
Music/sound is just vibrations of air, speakers vibrate the air to mimic sounds, amps do this by varying the voltage to the speaker, the "pop" is a varying voltage sent out to the speakers.

I doubt car systems used speaker relays but home systems often do, these delay speaker connection for a few seconds after power up, avoiding the user from hearing the "pop" which is still occurring, lol, but not heard.
Sub-woofer amps almost always have a speaker relay, if it fails you will get a "thump" at power up and then another "thump" about 5 minutes after power is off, lol, doesn't effect sound quality, just annoying.

"Pop" could come from pre-amp or amp, the head unit often has both in a car system, so if you change the head unit no more "pop".
If you have a "premium" sound system it may have a separate amp, so you could get the "pop" even with new head unit if the amp is the part that is "popping".

Ranger radio diagrams here: Ford Ranger Radio Wiring Diagram

Don't see Premium for 1998-2002, but diagrams could just be missing.

Last edited by RonD; 04-27-2016 at 01:06 PM.
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