I dont know why but the black wire dosent get used, i left it on the original orange connector.
The outer wire on the rca i cut back as far as i need to solder the inner wire and cut it off there, then after i had solderd it i wrapped the whole lot in insulating tape to stop it coming into contact with anything.
jimbo
 
i'm thimking that you still need the black and sleeve braided wire connection as this acts as an earth for the audio signal circuit, on an unbalanced line, which the phono input and output connection is, you may find it'll hum, or become noisy with out it.
BTW iwas talking bllx with the phase reverse at this stage of the connection, it would just not work if you wired it up wrong.
 
ive just got to my parents house after driving 200 miles..... i have no buzzing or noise apart from bass coming from the speakers.
fingers crossed i have cracked this problem!!
jimbo.
 
yeh,
you should be ok,
lifting an earth is not an uncommon practice, both with audio, and audio mains wiring, it does help when trying to eliminate ground loops.
 
gotoneatlast said:
yeh,
you should be ok,
lifting an earth is not an uncommon practice, both with audio, and audio mains wiring, it does help when trying to eliminate ground loops.
Click to expand...

Do it all the time on data wiring, ground the screen but at only one end not both. Don't know what ground loops are haven't heard of that one.
 
jimbodisco said:
ive just got to my parents house after driving 200 miles..... i have no buzzing or noise apart from bass coming from the speakers.
fingers crossed i have cracked this problem!!
jimbo.
Click to expand...

Well Done jimbo.... What Vibe FLI loudspeakers did you fit were they a direct replacement or did you have to do a few mods to the subs door pod.
 
discool said:
Do it all the time on data wiring, ground the screen but at only one end not both. Don't know what ground loops are haven't heard of that one.
Click to expand...


Earth loop piccy - should be self explanatory.
cpstudioinstall.l.jpg
 
gotoneatlast said:
it looks like a simple audio circuit to me.
Click to expand...

That's why then.. Not my field, to me it looks like a two core cable with a screen linking two units, but as i said with data ground only at one end of a screen cable or cable with an earth drain, that will be unit A in the pic and not terminated on a patch panel.
 
the application is irrelevant
if the earth screen is connected to ground at BOTH ends, yu induce noise into the earth plane. with mains equipment, yu get hum, with other systems, you get electrical noise.
That is why on all good cat5+ system, screened cable is used, but the screen is not connected at the wall outlets - so that the screening is broken between the system cabinets and the data equipment (PC's etc). same with audio systems - never connect the screening at both ends to earth.
 
yeh, i see,
i think what i'm tripping up on is differentiating between the earth 'screen', and the mains earth.
At work in general we've wired balanced circuits with the screen going to the chassis of a unit or racks, i can see the danger of having the earth mains in the 'loop', and also in audio terms the introduction of 50HZ hum would be an obvious problem.

Thanks.
 
Voltage is a differential quantity, which appears between two points having some electrical potentials. To measure the voltage of a single point, a reference point must be selected to measure against. This common reference point is called ground and considered to have zero voltage.
This signal ground may or may not actually be connected to a power ground. A system where the system ground is not actually connected to another circuit or to earth (though there may still be AC coupling) is often referred to as a floating ground.
 
The Mad Hat Man said:
Voltage is a differential quantity, which appears between two points having some electrical potentials. To measure the voltage of a single point, a reference point must be selected to measure against. This common reference point is called ground and considered to have zero voltage.
This signal ground may or may not actually be connected to a power ground. A system where the system ground is not actually connected to another circuit or to earth (though there may still be AC coupling) is often referred to as a floating ground.
Click to expand...

A cut & paste from "Circuit ground versus earth" on the www.
 
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