Stereo system gremlins

[Jackrabbit41]

About a month ago I put in 4 new speakers, an amp, and a self amplified sub. I already had a ken wood deck. Everything worked great no problems what so ever, sounds amazing. Then, this last weekend I pulled everything out of my truck to bed line the floor boards. Once I put everything back in, I now have speaker whine. But when I unplug the RCA cables from the sub it mostly goes away. Theres still a tiny tiny bit but its not bad. My grounds are good. I haven't tried running a ground to the negative terminal on the battery yet cus i don't have that long of a wire, but other then that my bounds are really good. I even tried bare metal on the frame and it still whines. When the RPMs go up, so does the whine. This never was around before I yanked everything out. Anyone got any ideas? I've looked up some things, but still can't find a fix. And just about an hour ago, I switched the 2 RCA cables going to the sub to see if that helped and now my speakers won't play any sound but the whine. The amp and sub are on, but no sound comes out from speakers. I wanna take it into my local music shop to see if they can help, but i got no money right now. I've spent hours trying to fix this, but haven't gotten anywhere. Pretty fed up with it. Its all brand new and my RCA cables are high quality with thick shielding so i doubt they're picking up any interference. 

[benjy_26]

Are your power cables and signal cables in close proximity to each other?

[Jackrabbit41]

Are your power cables and signal cables in close proximity to each other?

Yes very close

[benjy_26]

Send the power down one sideof the cab and the signal down the other side. Those have to be seperate.

[Jackrabbit41]

Send the power down one sideof the cab and the signal down the other side. Those have to be seperate.

Ok thanks. The weird thing is before I had the power and rca right next to each other like I do now but now it's whining but ill separate everything

[benjy_26]

Maybe they got twisted up this time around? Dunno why you WEREN'T getting noise before, to be honest.

[Jackrabbit41]

Maybe they got twisted up this time around? Dunno why you WEREN'T getting noise before, to be honest.

Maybe. I'll pull off the split loom and separate them here in a bit

[88mjblue]

I think maybe you did something when you re-wired everything after taking it all out. I would double-check that you have the speaker wires from the amp to the speakers wired correctly to matching positive/negative terminals on both ends. And check the RCAs from the receiver to amp for the same.

Did you label everything before you took it out?

 

You said you had a powered sub? How do you have the wiring set up to power/ground for both sub and amp? Do you have x2 distribution blocks for ground/power split to both (i.e. common ground). If you unplug the sub's power/ground does it sound good playing from just amp + 4 speakers?

 

Also, I don't think the issue is running the power and signal lines close to each other. The comanche cab is so short and this problem really only happens on longer stretches of cable runs. I have a fat 0 AWG cable running right next to RCAs and don't have any wine at all, and I'm using some basic mid-range nowhere near close to audiophile quality RCAs. Plus, like you said, it was sounding fine before with cables together. If possible I would still separate as a matter of course (not sure if you can, if your cables have the length to do so.)

 

Small thing, and probably not it, but headunits usually have a menu option to turn off the internal amp (if not using an external one) and that can help eliminate some noise. Just a tip if you haven't done this, and this is probably not what's causing that wine, but will help with sound when you do get to the bottom of this! So frustrating that it worked perfectly fine before and now it's having problems after you did all that work! Did you remove the full dash and bedline the firewall too?

[Jackrabbit41]

I think maybe you did something when you re-wired everything after taking it all out. I would double-check that you have the speaker wires from the amp to the speakers wired correctly to matching positive/negative terminals on both ends. And check the RCAs from the receiver to amp for the same.

Did you label everything before you took it out?

 

You said you had a powered sub? How do you have the wiring set up to power/ground for both sub and amp? Do you have x2 distribution blocks for ground/power split to both (i.e. common ground). If you unplug the sub's power/ground does it sound good playing from just amp + 4 speakers?

 

Also, I don't think the issue is running the power and signal lines close to each other. The comanche cab is so short and this problem really only happens on longer stretches of cable runs. I have a fat 0 AWG cable running right next to RCAs and don't have any wine at all, and I'm using some basic mid-range nowhere near close to audiophile quality RCAs. Plus, like you said, it was sounding fine before with cables together. If possible I would still separate as a matter of course (not sure if you can, if your cables have the length to do so.)

 

Small thing, and probably not it, but headunits usually have a menu option to turn off the internal amp (if not using an external one) and that can help eliminate some noise. Just a tip if you haven't done this, and this is probably not what's causing that wine, but will help with sound when you do get to the bottom of this! So frustrating that it worked perfectly fine before and now it's having problems after you did all that work! Did you remove the full dash and bedline the firewall too?

I'll try some of this when I have time this weekend. I only bed line the floorboards and what I could reach on the fire wall. I didn't go able the fuse box and pedal mounts