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In Reply to: RE: The reason Grado rejected that is because posted by Ralph on March 15, 2017 at 09:39:07
The problem is the shield. Only shielding ONE lead makes the noise (hum) introduced into the two leads inherently unbalanced and NOT common mode, so it can't be cancelled in the differential amp. By using XLR, you're right, problem prevented, but hardly any turntables use XLRs (which I think should be universal in audio.)
Follow Ups:
Its the connection that occurs at the output of the tone arm, which is usually balanced.
There are 5 connections- the 5th being ground. Because of this you can set up an old BSR or Dual with a balanced connection simply by changing out the interconnect cable.
The ground ties to the shield of both channels. At the output of the arm.
The arm is equipped with a 5-pin connection (like an SME arm) then this is really easy to deal with as you just plug in the new cable.
Only one channel shown.
The two signal conductors would be twisted (twist not shown).
Ground is just for shielding.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
nt
Yes, balanced.
Microphones connect to a transformer primary or a differential circuit and they are connected using a balanced connection.
A differential circuit accepts a balanced connection.
A transformer primary accepts a balanced connection.
Some people confuse the terms "balanced" and "differential".
The term "differential" describes a circuit.
The term "balanced" describes a way of connecting a source to a differential circuit or a transformer.
With a transformer you can have a fully balanced connection without having a differential circuit.
Some equipment has a input stage circuit and a output stage circuit that are differential while the rest of the circuit in the unit is single ended.
Other equipment uses input and output transformers while the rest of the circuit in the unit is single ended.
Both of these type units accept fully balanced input and output connections.
Some special equipment is fully differential from input to output.
Some using input and output transformers with fully differential circuits in between and some using active differential circuits from input to output and no transformers.
All of these will accept fully balanced connections.
In the studio and at home I have used, maintained and repaired units using all of the type circuits described above.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
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