Menu
Forum
What's new
New posts
Live Activity
Search forums
Members
Registered members
Classifieds Member Feedback
Car Audio Discussion
General Car Audio
Car Audio Build Logs
Car Audio Equipment
Subwoofers
Speakers
Amplifiers
Head Units
Car Audio Help
Wiring, Electrical and Installation
Enclosure Design & Construction
Car Audio Classifieds
Car Audio Classifieds
Car Audio Wanted
Classifieds Member Feedback
Gallery
New media
New comments
Search media
SHOP
Shop Head Units
Shop Amplifiers
Shop Speakers
Shop Subwoofers
Shop eBay Car Audio
Test
Forum
Search
Search titles only
Search titles only
Log in / Join
Search
Search titles only
Search titles only
What's new
New posts
Live Activity
Search forums
Members
Registered members
Classifieds Member Feedback
Menu
Reply to thread
Forum
Car Audio Help
Wiring, Electrical & Installation
Alternator Whine - nothing is working!
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Message
<blockquote data-quote="keep_hope_alive" data-source="post: 8656957" data-attributes="member: 576029"><p>Whine is typically from a ground loop or voltage potential on the signal ground relative to chassis. When you connect the sub amp RCA you create a loop, which may be why the issue is only when both amps are connected. </p><p></p><p>The loop may exist because the amp grounds are tied together and the amps internally tie RCA ground to chassis ground or not (loop vs. floating) They may also exist due to damage in the RCA itself. I've seen RCA's made with incorrect solder connections.</p><p></p><p>What if you feed the sub amp from the RCA outputs on the 4channel? You lose sub level control but it is worth a try to narrow down the loop location.</p><p></p><p>What happens when you run a wire between the two amps' RCA shields? This shouldn't be a problem if everything is OK. </p><p></p><p>You can also use a DMM to measure resistance from the RCA shield to amp/chassis ground in each amp, an also in the RCA shield to amp/chassis ground.</p></blockquote><p></p>
[QUOTE="keep_hope_alive, post: 8656957, member: 576029"] Whine is typically from a ground loop or voltage potential on the signal ground relative to chassis. When you connect the sub amp RCA you create a loop, which may be why the issue is only when both amps are connected. The loop may exist because the amp grounds are tied together and the amps internally tie RCA ground to chassis ground or not (loop vs. floating) They may also exist due to damage in the RCA itself. I've seen RCA's made with incorrect solder connections. What if you feed the sub amp from the RCA outputs on the 4channel? You lose sub level control but it is worth a try to narrow down the loop location. What happens when you run a wire between the two amps' RCA shields? This shouldn't be a problem if everything is OK. You can also use a DMM to measure resistance from the RCA shield to amp/chassis ground in each amp, an also in the RCA shield to amp/chassis ground. [/QUOTE]
Insert quotes…
Verification
Post reply
Forum
Car Audio Help
Wiring, Electrical & Installation
Alternator Whine - nothing is working!
Top
Menu
Home
Refresh