Car Audio Facts.

[audioholic 5,000+ posts]

So does the idea that you have the entire cross sectional area of the chassis available as a conducting path for a ground, but people still stick doggedly to that one.
The fact for both is that the steel in the chassis is not uniform and as such you get areas of high and low (relative) resistance. The majority of the current flows in the low resistance areas and these would act much like your power wire in regards to the field generated (slightly diffused). Best case these areas are 10x more resistive than copper and are nowhere near the 10x the cross sectional area of the power wire that you run making the idea that you need to keep your section of low resistance copper ground wire as short as possible totally laughable since the resistance of a few inches of large diameter copper wire is negligible compared to the several feet of high resistance autobody sheetmetal.

While I agree the chassis is not as resistance-free *** the power cable itself, that still does not bely the fact that laying your signal cable along your chassis is not the same as zip-tying to the power cable. While the chassis does and will dissipate the current flow through it, and have places of concentration, there's no getting around it cannot possibly be as concentrated as it is/was when travelling in the cable. IOW, the current passing through the 'hot spots' in your chassis (low resistance) will still not be as intense as passing the entire current through that (relatively) small cable. Not to mention, what would the chances be of running your signal wire all along this 'hot spot' in your chassis? Therefore, any magnetic field generated would be minimalized.

 

[helotaxi 5,000+ posts]

Not a very good chance but it can happen. Still doesn't negate the fact that my power, ground (going all the way back to the battery) and RCAs are run together with no noise present. There's a double concentration there and it isn't an issue.

 

[audioholic 5,000+ posts]

Not a very good chance but it can happen. Still doesn't negate the fact that my power, ground (going all the way back to the battery) and RCAs are run together with no noise present. There's a double concentration there and it isn't an issue.

Ive always trusted and respected what you have to say. Therefore, Im confident if and when I try an RCA noise test (I run optical now) that I'll find you are correct. All Ive been trying to say is, I wouldn't use the 'your signal cable lays on your chassis anyway' arguement. While your side of the debate is probably correct, that arguement has a major problem with it.

Cheers.

 

[Jep772 10+ year member]

1/0 can crack someones skull.

 

[WulfComp 10+ year member]

Helotaxi, with your situation and taking into account the "right-hand rule" of magnetic fields through a wire, couldn't having both your power and ground wire running next to each other cancel out the field to be induced into the signal wire?

 

[helotaxi 5,000+ posts]

Having the power wire along the - charged (effectively) chassis would do the same thing. You can run your RCA between the + and - wire and DC still isn't going to induce noise in the AC signal. You have to have movement of either the wire or the field to induce voltage (which is what noise is, stray voltage). You could theoretically get noise from your speaker wire to your RCAs (in a high power low impedance situation) but even that isn't going to happen or be noticeable (same basic signal in both). The only times I've heard of genuine induced noise was when the signal wire was run in very cloase proximity to the AC blower motor. The pulsing current in the motor was enough to induce noise in relatively cheap RCAs.

 

[bdawson72 5,000+ posts]

Helotaxi, with your situation and taking into account the "right-hand rule" of magnetic fields through a wire, couldn't having both your power and ground wire running next to each other cancel out the field to be induced into the signal wire?

I thought that it was the left hand rule actually

 

[WulfComp 10+ year member]

http://en.wikipedia.org/wiki/Magnetic_field#Magnetic_field_of_current_flow_of_charged_particles

Field Orientation based on the right hand rule

 

[sdmtnbiker420 10+ year member]

Car Audio Fact #16 - the "big three" does practically nothing, except for voiding your vehicles factory warranty when it burns down cause you thought the big three was a big deal.

 

[audioholic 5,000+ posts]

Car Audio Fact #16 - the "big three" does practically nothing, except for voiding your vehicles factory warranty when it burns down cause you thought the big three was a big deal.

Stop trolling, now you are just obvious.

 

[Hintzyboy 5,000+ posts]

it was a joke, some peeps like spl some like sq, but everyone gets pissey if you say the
other is better or where its at.

but for me, its about music, not winning an spl comp, i want great sq and nice and loud.

sql,

but peeps have issues with that term also.

too many peeps have isues.

if music didnt exhist would spl comps?

I have an issue with peeps. Nasty *** marshmallow birds FTL.

Although microwaving them is always fun.

 

[helotaxi 5,000+ posts]

Peeps racing FTW!

 

[supa_c 5,000+ posts]

Poor quality amplifier RCA sheilding can induce noise ( memphis bell, md2d), similiar to ground loop.

Its not always the head unit.

 

[theCybe 5,000+ posts]

Peeps racing FTW!

x2, peepJoust!!

 

[sdmtnbiker420 10+ year member]

Stop trolling, now you are just obvious.

hahah another pathetic soul who has wasted his time with the "big 3"

dont hate the player, hate the game