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<blockquote data-quote="kiathug09" data-source="post: 6762987" data-attributes="member: 621055">If anyone knows the solution to this, that would be GREAT. Anyways, I just registered on here and I&#039;m looking for some help. I previously had 2 subs and an amp hooked up working fine in my car. I decided to upgrade and went with a JBL GTO1214D subwoofer and a JBL GTO3501 amplifier. Well I recently installed them and found that when I turn up the input level, there is just a constant rumble from the sub, not hitting with the beat at all and will still rumble even if no music is playing. I found that it only happens when the RCA&#039;s are plugged in. My previous setup worked fine with the same wiring and everything. So I&#039;m stumped on this one and hoping one of you guys can help me out.This is all I&#039;ve done to try to fix the problem with no luck:Replaced RCA&#039;sReplaced Ground WiresNew Ground Location for Headunit and AmpDouble checked everything was wired correctlyTried a Ground Loop Isolator------------------------------------All of these things didn&#039;t work for me.I have a Pioneer Head UnitWhen I tried the Ground Loop Isolator it stopped the rumbling but then there was no hitting at all...The JBL equipment is brand new out of the box.I think I have everything grounded good.I&#039;m pretty sure the new equipment is all working properly because I took it down to an audio shop and they tested with a MP3 player with an RCA connection. The sub appeared to work fine then so wouldn&#039;t that narrow it down to something before the amp? I replaced the RCA&#039;s so I don&#039;t know what else it could be.RCA&#039;s-Amp = RumblingRCA&#039;s-Ground Loop Isolator-Amp = No hitting at allI know it can vary from system to system but keep in mind that my previous setup worked fine with all of the wiring how it is.//content.invisioncic.com/y282845/emoticons/confused.gif.e820e0216602db4765798ac39d28caa9.gifThanks for the help.</blockquote>

[QUOTE="kiathug09, post: 6762987, member: 621055"] If anyone knows the solution to this, that would be GREAT. Anyways, I just registered on here and I'm looking for some help. I previously had 2 subs and an amp hooked up working fine in my car. I decided to upgrade and went with a JBL GTO1214D subwoofer and a JBL GTO3501 amplifier. Well I recently installed them and found that when I turn up the input level, there is just a constant rumble from the sub, not hitting with the beat at all and will still rumble even if no music is playing. I found that it only happens when the RCA's are plugged in. My previous setup worked fine with the same wiring and everything. So I'm stumped on this one and hoping one of you guys can help me out. This is all I've done to try to fix the problem with no luck: Replaced RCA's Replaced Ground Wires New Ground Location for Headunit and Amp Double checked everything was wired correctly Tried a Ground Loop Isolator ------------------------------------ All of these things didn't work for me. I have a Pioneer Head Unit When I tried the Ground Loop Isolator it stopped the rumbling but then there was no hitting at all... The JBL equipment is brand new out of the box. I think I have everything grounded good. I'm pretty sure the new equipment is all working properly because I took it down to an audio shop and they tested with a MP3 player with an RCA connection. The sub appeared to work fine then so wouldn't that narrow it down to something before the amp? I replaced the RCA's so I don't know what else it could be. RCA's-Amp = Rumbling RCA's-Ground Loop Isolator-Amp = No hitting at all I know it can vary from system to system but keep in mind that my previous setup worked fine with all of the wiring how it is. [IMG]//content.invisioncic.com/y282845/emoticons/confused.gif.e820e0216602db4765798ac39d28caa9.gif[/IMG] Thanks for the help. [/QUOTE]

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