[don ward]

I just bought a used Dynafex noise reduction unit and its XLR in/out
only. It has switchable for -10 0 +10 level.
How do you wire XLR for single ended operation?
thanks

dnw

[Bob Woodward]

don ward wrote:
I just bought a used Dynafex noise reduction unit and its XLR in/out
only. It has switchable for -10 0 +10 level.
How do you wire XLR for single ended operation?
thanks

dnw

If possible, use balanced connections. !!!

If not;
look at / in the XLR. Pins are numbered.
1 = Ground
2 = signal with positive phase
3 = signal with negative phase ( 180 deg inverted )

To the device's ( Dynafex ) input:
connect signal to pin 2
connect ground to pin 1
connect pin 3 to pin 1 ( inside the XLR at the cable )

From the device's output:
connect signal to pin 2
connect ground to pin 1
leave pin 3 unconnected

Andre

[Serge Auckland]

Bob Woodward" "Bob wrote in message
...
don ward wrote:
I just bought a used Dynafex noise reduction unit and its XLR in/out
only. It has switchable for -10 0 +10 level.
How do you wire XLR for single ended operation?
thanks dnw

If possible, use balanced connections. !!!

If not;
look at / in the XLR. Pins are numbered.
1 = Ground
2 = signal with positive phase
3 = signal with negative phase ( 180 deg inverted )

To the device's ( Dynafex ) input:
connect signal to pin 2
connect ground to pin 1
connect pin 3 to pin 1 ( inside the XLR at the cable )

From the device's output:
connect signal to pin 2
connect ground to pin 1
leave pin 3 unconnected

Andre


The Dynafex DX1 has an internal switch to change from balanced to unbalanced
operation. I haven't checked if the DX2 and DX3 also have them, but manuals
are available for download on ftp://ftp.orban.com/CRL/. The above advice is
perfect for electronically balanced or fully floating transformer balanced
inputs and for centre-tapped transformer balanced outputs but not for
centre-tapped transformer balanced inputs and fully floating outputs. In
other words, before unbalancing a balanced input or output, you need to know
what type of balancing is used.

S.

--
http://audiopages.googlepages.com

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http://audiopages.googlepages.com

[Bob Woodward]

Serge Auckland wrote:
Bob Woodward" "Bob wrote in message
...
don ward wrote:
I just bought a used Dynafex noise reduction unit and its XLR in/out
only. It has switchable for -10 0 +10 level.
How do you wire XLR for single ended operation?
thanks dnw
If possible, use balanced connections. !!!

If not;
look at / in the XLR. Pins are numbered.
1 = Ground
2 = signal with positive phase
3 = signal with negative phase ( 180 deg inverted )

To the device's ( Dynafex ) input:
connect signal to pin 2
connect ground to pin 1
connect pin 3 to pin 1 ( inside the XLR at the cable )

From the device's output:
connect signal to pin 2
connect ground to pin 1
leave pin 3 unconnected

Andre


The Dynafex DX1 has an internal switch to change from balanced to unbalanced
operation. I haven't checked if the DX2 and DX3 also have them, but manuals
are available for download on ftp://ftp.orban.com/CRL/. The above advice is
perfect for electronically balanced or fully floating transformer balanced
inputs and for centre-tapped transformer balanced outputs but not for
centre-tapped transformer balanced inputs and fully floating outputs. In
other words, before unbalancing a balanced input or output, you need to know
what type of balancing is used.

S.

You are absolutely right Serge.

Should have added the "connect pin 3 to ground" in case of ( allmost )
no output, from a transformer balanced output.
In fact, this also applies for an electronically balanced output that
should then give +6dB at the other output-pin.

Every designer of equipment should strive to transformer-like behavior.
Connecting should then always be the same.

But when or where is a center-tapped transformer used ?

Andre

[Serge Auckland]

"Bob Woodward" "Bob wrote in message
...
Serge Auckland wrote:
Bob Woodward" "Bob wrote in message
...
don ward wrote:
I just bought a used Dynafex noise reduction unit and its XLR
in/out only. It has switchable for -10 0 +10 level.
How do you wire XLR for single ended operation?
thanks dnw
If possible, use balanced connections. !!!

If not;
look at / in the XLR. Pins are numbered.
1 = Ground
2 = signal with positive phase
3 = signal with negative phase ( 180 deg inverted )

To the device's ( Dynafex ) input:
connect signal to pin 2
connect ground to pin 1
connect pin 3 to pin 1 ( inside the XLR at the cable )

From the device's output:
connect signal to pin 2
connect ground to pin 1
leave pin 3 unconnected

Andre


The Dynafex DX1 has an internal switch to change from balanced to
unbalanced operation. I haven't checked if the DX2 and DX3 also have
them, but manuals are available for download on ftp://ftp.orban.com/CRL/.
The above advice is perfect for electronically balanced or fully floating
transformer balanced inputs and for centre-tapped transformer balanced
outputs but not for centre-tapped transformer balanced inputs and fully
floating outputs. In other words, before unbalancing a balanced input or
output, you need to know what type of balancing is used.

S.

You are absolutely right Serge.

Should have added the "connect pin 3 to ground" in case of ( allmost )
no output, from a transformer balanced output.
In fact, this also applies for an electronically balanced output that
should then give +6dB at the other output-pin.

Every designer of equipment should strive to transformer-like behavior.
Connecting should then always be the same.

But when or where is a center-tapped transformer used ?

Andre

Centre-tapped transformers are used most commonly on microphone inputs, and
on outputs which will be driving very long lines, especially over open
wires. The benefit of a centre-tap is that the balanced line has a low
resistance path to ground through the DC resistance of the winding, and so
electrostatic charges are grounded. Phantom-like signalling can also be done
over the balanced line if there is a centre-tap, and for long lines,
especially open wires, if both ends are centre-tapped, then a break in one
line will result, of course, in a loss of balance, but also only in a drop
in signal, not a total loss of signal.

Centre-tapped transformer balancing is now pretty obsolete, although many
electronically balanced inputs and outputs are effectively centre-tapped as
they are balanced about earth rather than fully floating. Some of the better
pro equipment *does* have fully floating electronic balanced outputs, and a
few even have fully floating electronically balanced inputs.

S.

--
http://audiopages.googlepages.com