Turntable to XLR balanced input ?

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#6
audiopro said:
No advantage at all except xlr plugs are a better connector than rca. You are just running unbalanced anyway using rca to xlr cable
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This statement as written is wrong. If wired correctly (shielded twisted pair) and if the designer of the balanced input was not an idiot (in this case possibly Doug Self so def not), then you can still get good common mode rejection as any ground currents will flow chassis to chassis down the shield. Whether this is audible or not depends on a lot of things but it should certainly be tried.
 
#8
Remember that in almost any cartridge there's a connection from one of it's ground pins to it's metal body or another shielding. Thus, a real balanced wiring requires some microsurgery on the cartridge which might not be anybody's task.


Best regards!
 
#10
then you can still get good common mode rejection as any ground currents will flow chassis to chassis down the shield.
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That's not common mode.
However I agree the OP should try it if he wants to.
Remember that in almost any cartridge there's a connection from one of it's ground pins to it's metal body or another shielding
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Only true of moving magnet cartridges. Most moving coil are floating
 
#12
I think you might want to re-read Bill Whitlock. His discussions all center around balanced systems. Most importantly the matching of impedance between the two signal legs of a balanced line. In the case of what the OP wants to do, one leg is ground or zero ohms impedance. It is not a balanced impedance line. Therefore common mode rejection is poor.
If the OP were connecting the cartridge to a balanced input phono section, then yes, there would be common mode rejection. But he is taking an unbalanced signal from his phono preamp to a balanced input and either floating the inverting phase (high impedance) or grounding it (zero impedance).
Will there be some reduction in ground currents causing noise - possibly, but no more than if he uses an RCA input. In fact if he floats the inverting leg on the XLR, noise may actually increase due an open connection on the balanced input
 
#13
If there is a potential difference between the cases of 2 units (and there usually is) then a current will flow through the shield. In a single ended connection that converts into common mode noise. A balanced receiver input done properly will shunt that current via pin one and avoid the common mode noise. Not as good as having a true balanced driver, but there is there is a definate chance.

Devices that use the ingenius chips he designed still give >80dB CMRR with a single ended source.

Nothing lost if it doesn't produce an audible gain!
 
#14
My phono pre has balance in and out. I want to try balance phono for a while but I never actually do it. My phono cable is a single end cable. I plan to convert it into a balance cable.

Here is what I have in my mind. Any suggestions?
 

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#16
hi guys
so I try TT on that cable and.... no difference in sound. but my cables from TT- preamp or preamp- amp pick up noise from my router specifically 2.4 Ghz wireless signal. If I turn that of no noise what so ever but I can't turn that of completely or move router away. so on this XLR cable I notice less of that noise. to hear anything will need to turn it to 90, before was heard at about 60 and my usually listen is 40-45 max depends on source....I guess is better shielded
thanks all
 
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