Ground and wiring question Yamaha M-406 mixer

[BoomWomb]

Hi All,

I would appreciate any help anyone can give that address this specific query.
I am putting direct outs in (unbalanced, because I have little time to rig something else).

I can do a mod with just TS wire, BUT: I have lots of TRS wire lying around. Are the following things TRUE?:

1) I can use the TRS wire as long as I ground the shield on ONE END ONLY?

2) all GROUNDS are the same, and therefore, I can ground one end of the shielded DIRECT OUT cable to the SAME GROUND used by the XLR input?

3) if 2 above is true, then doing it this way with shielded wire, one end grounded, will give you just a bit better signal protection than just unbalanced via TS cable?

Thanks! I love you!

Boom

 

[user 130681]

1/ TRS will work perfectly as TS, it will ignore the R wire/connection.
2/ Not all grounds are the same. This causes ground loops and hum if mixed up.
3/ Balanced TRS has much higher noise rejection than TS.

 

[BoomWomb]

1/ TRS will work perfectly as TS, it will ignore the R wire/connection.
2/ Not all grounds are the same. This causes ground loops and hum if mixed up.
3/ Balanced TRS has much higher noise rejection than TS.

Hi Jon S.,

If I use TRS, I have to ground the shield at one end, right? Otherwise the shield is floating and will create noise?
I had read this was true, and that's why I assumed one end of the shield had to be grounded. My question was, can I ground the shield of the Direct Out I installed, to the ground point of the XLR input?

 

[user 130681]

The tip is connected at both ends. The Shield is connected at both ends as is the Ring.
Effectively the ring wire is not used in a mono cable situation. It does not create noise, it just means that if you want to use the lead as a balanced lead, it will work as normal.
If you are converting balanced to mono, connect the mono end, R and S together but not both ends.

Both ends of the sheild must be ground.