Possible bad ground or HU?

[lilg4mdalbc]

Ok well heres my problem. The other day I traded in my amp for a lanzar monoblock, and when I connected it(had a ground loop installed) everything sounded good except I noticed my subs werent hitting some of the lower notes. So I decided to take it the ground loop, and all of a sudden, the started rumbling loudly, like it was constantly hitting like a 40hz tone. So after trying to figure out the problem, I discovered that when disconnecting the rcas, this rumbling stops. I decided to check the rcas(had fosgate rcas in there) and tested it with some monster rcas, and same thing. I also tried it with my bro's powerbass sub and same thing. Then I tried it in my friends car with his two Kicker CVRs and clean, no problem. So then after driving around with no subs, I noticed that my speakers give a very small whine when volume is at 0, that seems to change with acceleration. So this leads me to believe that I either have a bad Pioneer HU or a bad ground(which is what im leaning towards). So ive checked ALL my connections and they all seem to be good to me. I wanted to relocate my HU ground, but im not unsure which is the best location to do it to. Either that or get a ground loop that DOESNT block out my lows. What are your recommendations? Any help will be appreciated.

[dj_ender]

Ok well heres my problem. The other day I traded in my amp for a lanzar monoblock, and when I connected it(had a ground loop installed) everything sounded good except I noticed my subs werent hitting some of the lower notes. So I decided to take it the ground loop, and all of a sudden, the started rumbling loudly, like it was constantly hitting like a 40hz tone. So after trying to figure out the problem, I discovered that when disconnecting the rcas, this rumbling stops. I decided to check the rcas(had fosgate rcas in there) and tested it with some monster rcas, and same thing. I also tried it with my bro's powerbass sub and same thing. Then I tried it in my friends car with his two Kicker CVRs and clean, no problem. So then after driving around with no subs, I noticed that my speakers give a very small whine when volume is at 0, that seems to change with acceleration. So this leads me to believe that I either have a bad Pioneer HU or a bad ground(which is what im leaning towards). So ive checked ALL my connections and they all seem to be good to me. I wanted to relocate my HU ground, but im not unsure which is the best location to do it to. Either that or get a ground loop that DOESNT block out my lows. What are your recommendations? Any help will be appreciated.

If you have solid grounds and a decent head unit you do not need a ground loop isolator. Check all of your grounds, all of them.

[lilg4mdalbc]

Which ones would those be? Cuz I have checked the amp ground several times, but I dont know how to check the ground on the hu, so I want to relocate it to a solid spot. Also, I forgot to mention that I did my big 3 and grounded them to the strut tower.

[dj_ender]

Which ones would those be? Cuz I have checked the amp ground several times, but I dont know how to check the ground on the hu, so I want to relocate it to a solid spot. Also, I forgot to mention that I did my big 3 and grounded them to the strut tower.

I'm talking about engine and chassis grounds as well. They need to all be there, and solidly grounded to BARE metal. And make sure the RCAs are on the opposite side of the car from the power cables.

[lilg4mdalbc]

Ok well I have my battery and alt grounded to bare metal. I also cleaned up the ground on the thermostat housing. What other grounds are there?

[dj_ender]

Ok well I have my battery and alt grounded to bare metal. I also cleaned up the ground on the thermostat housing. What other grounds are there?

Do you have the valve cover ground on as well as the mount ground on the drivers side? And did you say if you had moved the hu ground yet? If not do so.

[lilg4mdalbc]

Yes to both. I have the valve cover on as well as the ground to the tower. And I tried regrounding the HU but i wanna reground again since i think my choice wasnt really that good. Whats a good place to reground the HU?

[dj_ender]

Yes to both. I have the valve cover on as well as the ground to the tower. And I tried regrounding the HU but i wanna reground again since i think my choice wasnt really that good. Whats a good place to reground the HU?

You can run it down to the center hump, and bolt it down there.

[lilg4mdalbc]

Cool, sounds good. Always real helpful dj

[dj_ender]

Cool, sounds good. Always real helpful dj

Not a problem, let us know if you need more help.

[Soufkackicustom]

Ground the outside of the rca's......if you look at the end of the RCA you have the point in the middle and the outside ring. Strip a piece of wire and wrap it around the outside of the ring ground the other end of the wire. Common problem with pioneer radios

[lilg4mdalbc]

Ground the outside of the rca's......if you look at the end of the RCA you have the point in the middle and the outside ring. Strip a piece of wire and wrap it around the outside of the ring ground the other end of the wire. Common problem with pioneer radios

Ha ha ha I actually tried that after I regrounded the HU and it still did it, and it worked. I saw it on one of the posts I searched and thought why not give it a try. All I know is I got my bumps back Thanx for all the helpful suggestions.