Running a phono lead 50m, methods?

[cyborg]

Hey, I need to run a phono lead 50metres across a hall to a central amp. Would I be right thinking a 50m length of cable will encounter losses? What ways can I do this?

 

[P4Clock]

Hi

There is always a losses of quality when running cable long distances but 50m is not all that much try a wireless sender unit or get a gold plated cable

Dave

 

[Caged]

You need to balance it and then unbalance it at the other end. Boxes to do this are pretty cheap.

 

[Flukester]

Hi

There is always a losses of quality when running cable long distances but 50m is not all that much try a wireless sender unit or get a gold plated cable

Dave

a gold plated cable ?

over 50m your going to not only get signal loss but a lot of noise / hiss I would have thought.... guess it might be ok if you put enough signal level down it.

is it line level or higher ?

like other post said, wireless or balanced is the way to do it, which effectively cancels any noise as the noise gets induced 180 degrees out of phase on each signal wire... or sumthin like that

 

[P4Clock]

my audio system runs all over my house it covers some long distances and ever thing runs fine

 

[Dr.EM]

You need to balance it and then unbalance it at the other end. Boxes to do this are pretty cheap.

This would be best. Single ended line level runs arn't really good for 50m lengths. If you must do it with phono, use a low capacitance, well shielded cable to minimise high frequency losses and noise.

 

[Lowe]

...balanced is the way to do it, which effectively cancels any noise as the noise gets induced 180 degrees out of phase on each signal wire... or sumthin like that

Kinda - you have 3 connections in the cable. One is the signal itself, one is the signal but 180 degrees out of phase and the third is ground. The noise that is introduced will be the same phase on both signal connections, unlike the inverted phase on the second connection. The input of the amplifier is set up so that it looks for the difference in the phase between the two signals (known as a differential amp). It then recreates the signal based off the difference. Since the noise/interference will be the same phase on both signal connections the differential amp doesn't see it, and it's effectively lost.

Whoever invented that had their Weetabix that morning.

 

[Flukester]

Ahh thats it , used to build amps using balance transformers, I suspect there are much better active methods now though

 

[dave-lew99]

Ahh thats it , used to build amps using balance transformers, I suspect there are much better active methods now though

Well, die hard analog designers will still use high quality transformers from the likes of lundahl and do the whole thing passively.

Active/electronic balancing is generally regarded to not be as good.