are rca connections grounded through amp/hu

[Skullz]

Often times you can have noise not only from bad grounds but you can have bad ground straps under the hood going from engine to battery or chassis, bad ignition wires, and bad spark plugs, there are a lot of things to check and start at one end and work your way methodically to the other removing each piece as the possible cause.

One other possibility is a bad amp, and you'll want to bench test that to confirm the source of the noise is withing the amp.

[kirill007]

So i checked all my RCA connections with a DVOM and guess im in the 75% of consumers and only my HU has grounded RCAs.So this raises a couple questions.

Im using Quad shield RG6, in my research of the pros/cons of using coax vs twisted wire, most people use the latter. Unless they have done well to keep their RCAs away from power wires, how do they not have noise? Since one wire carries the signal (unshielded) and the other is the drain wire, as usual.

I had forgotten but differential amps are the type used in professional or high end home audio that use balanced XLR 3 connector wiring. How do car audio systems use balanced signals on a 2 conductor wire unlike the XLR in other applications?

Also, are there HUs that send an inverse signal (balanced) output?

Power wires don't introduce any noise into the RCA's.

Unless your power wires carry AC voltage, which they shouldn't.

[beatinpearls]

So i checked all my RCA connections with a DVOM and guess im in the 75% of consumers and only my HU has grounded RCAs.So this raises a couple questions.

Im using Quad shield RG6, in my research of the pros/cons of using coax vs twisted wire, most people use the latter. Unless they have done well to keep their RCAs away from power wires, how do they not have noise? Since one wire carries the signal (unshielded) and the other is the drain wire, as usual.

I had forgotten but differential amps are the type used in professional or high end home audio that use balanced XLR 3 connector wiring. How do car audio systems use balanced signals on a 2 conductor wire unlike the XLR in other applications?

Also, are there HUs that send an inverse signal (balanced) output?

Power wires don't introduce any noise into the RCA's.

Unless your power wires carry AC voltage, which they shouldn't.

Though were using DC, won't you get some induced voltage from the magnetic field around the power wire?

[beatinpearls]

I was getting a slight hiss when I powered everything on. But what started all this was yesterday I was going around a bumpy corner and my RF tweeter started making a high freq pop and the signal sounded like it was fading suggesting a loose or bad RCA connection. Like I said earlier, I am using quad shield RG6 throughout. I know it is putting some strain on the preouts of my HU so I started looking into replacing all my interconnects with standard RCA cables. I really like the shielding of RG6 but not the lack of flexibility. In gonna try some 90 degree adapters I have and may look into making new cables out of softer material and use solder type ends. Last night I pulled the HU and made power and ground harnesses and added a HU chassis ground wire. I was previously using the factory car harness. I'm pretty sure the hiss started when I installed a 3 way active crossover. It will have to do til I can get a 360 and an RTA to tune it. I know the amp grounds are good as well as my big 3. I used a pilot bonding brush and connection paste on all my grounds. Either the tweeter levels are too high or it has something to do with that xover. Will rip if all apart and start tracing anyway.

[RooTxBeeR]

So i checked all my RCA connections with a DVOM and guess im in the 75% of consumers and only my HU has grounded RCAs.So this raises a couple questions.

Im using Quad shield RG6, in my research of the pros/cons of using coax vs twisted wire, most people use the latter. Unless they have done well to keep their RCAs away from power wires, how do they not have noise? Since one wire carries the signal (unshielded) and the other is the drain wire, as usual.

I had forgotten but differential amps are the type used in professional or high end home audio that use balanced XLR 3 connector wiring. How do car audio systems use balanced signals on a 2 conductor wire unlike the XLR in other applications?

Also, are there HUs that send an inverse signal (balanced) output?

Power wires don't introduce any noise into the RCA's.

Unless your power wires carry AC voltage, which they shouldn't.

Lol wait are you kidding me? That why every audio professional runs power separate from RCA's. Like I see EVERYONE, from Steve to Tony Candella.

[kirill007]

So i checked all my RCA connections with a DVOM and guess im in the 75% of consumers and only my HU has grounded RCAs.So this raises a couple questions.

Im using Quad shield RG6, in my research of the pros/cons of using coax vs twisted wire, most people use the latter. Unless they have done well to keep their RCAs away from power wires, how do they not have noise? Since one wire carries the signal (unshielded) and the other is the drain wire, as usual.

I had forgotten but differential amps are the type used in professional or high end home audio that use balanced XLR 3 connector wiring. How do car audio systems use balanced signals on a 2 conductor wire unlike the XLR in other applications?

Also, are there HUs that send an inverse signal (balanced) output?

Power wires don't introduce any noise into the RCA's.

Unless your power wires carry AC voltage, which they shouldn't.

Lol wait are you kidding me? That why every audio professional runs power separate from RCA's. Like I see EVERYONE, from Steve to Tony Candella.

Just because they do that doesn't mean that the main reason is noise.

Ask Tony if DC ever induces noise into AC voltage. (especially in these low voltage applications)

[beatinpearls]

I found the source of the scratching/popping that was coming through my tweeters that started all this. My highs amp is under the passenger seat and the sound would appear when I have my phone on the seat. Replicated it several times. Particularly when right above the speaker output / power input side of the amp. Reminds me of a guy I worked with. Whenever his cell phone would ring, his computer speakers would make similar noise. Anyone else seen this?

[MrSkippyJ]

So i checked all my RCA connections with a DVOM and guess im in the 75% of consumers and only my HU has grounded RCAs.So this raises a couple questions.

Im using Quad shield RG6, in my research of the pros/cons of using coax vs twisted wire, most people use the latter. Unless they have done well to keep their RCAs away from power wires, how do they not have noise? Since one wire carries the signal (unshielded) and the other is the drain wire, as usual.

I had forgotten but differential amps are the type used in professional or high end home audio that use balanced XLR 3 connector wiring. How do car audio systems use balanced signals on a 2 conductor wire unlike the XLR in other applications?

Also, are there HUs that send an inverse signal (balanced) output?

Power wires don't introduce any noise into the RCA's.

Unless your power wires carry AC voltage, which they shouldn't.

Lol wait are you kidding me? That why every audio professional runs power separate from RCA's. Like I see EVERYONE, from Steve to Tony Candella.

even steve says it doesn't matter.

http://www.stevemeadedesigns.com/board/topic/165028-speaker-wires-ran-next-to-power-wire/