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

Audio & Video Tech General discussion of audio and video for the Ford Ranger.

LinkBack Thread Tools Search this Thread
Old 04-27-2016
Thread Starter
Join Date: Apr 2016
Location: CA
Posts: 5
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
Reply With Quote
Old 04-27-2016
RF Veteran
iTrader: (1)
Join Date: Jan 2014
Location: Vancouver, BC
Posts: 7,608
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.
Reply With Quote

Related Topics
Thread Thread Starter Forum Replies Last Post
rangeley(pup) and ranger haymaker546 General Ford Ranger Discussion 7 09-23-2008 05:51 PM
Got another Honda...don't be too harsh. And some Pup pics RangerJustin Snapshots 7 08-17-2008 01:41 PM
speakers speakers speakers doug435 Audio & Video Tech 5 01-30-2006 01:50 PM
why would my new alpine speakers sound worse than my stock speakers? james13f Audio & Video Tech 21 04-03-2005 06:01 PM

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

All times are GMT -6. The time now is 02:07 PM.

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.