Speck Electronics SSM - Manual (Page 61)

Chapter 5 Wiring and Other
Fig 12. Balanced to Unbalanced Cables
When connecting the 1/4" unbalanced (TS) inputs and outputs of the
Model SSM to balanced equipment, it will be necessary to configure
your cables in order to unbalance the signal.
There are 2 types of balanced output circuits; transformer and
transformerless (electronically balanced). Balanced audio outputs are
normally terminated with 3 pin XL type connectors, 1/4" TRS (stereo)
type jacks, or on rare occasions, with screw terminals.
When connecting the unbalanced (TS) input of the Model SSM to a
transformer output, it will be necessary to connect the low (-) signal to
the ground conductor; pin 3 to pin 1 of the XL, or the ring to the sleeve
of a TRS plug. When connecting to a transformerless output, it is
standard practice to connect to the high (+) output only and not connect
the low (-) signal to ground. Check the manual of each piece of audio
equipment for specific details.
Due to the lack of standards for XL connectors, some equipment may
use pin 3 of the XL for the high signal. For this configuration, connect
pin 2 to pin 1 on the XL, and connect the high to pin 3.
There are 2 types of balanced input circuits; transformer and
transformerless (electronically balanced). Balanced audio inputs are
normally terminated with 3 pin XL type connectors, 1/4" TRS (stereo)
type jacks, or on rare occasions, with screw terminals.
When connecting the unbalanced (TS) output of the Model SSM to a
balanced input it is almost always necessary to connect the low (-) input
to the ground conductor; pin 3 to pin 1 for XL, or the ring to the sleeve
of a TRS plug.
Due to the lack of standards for XL connectors, some equipment may
use pin 3 of the XL for the high signal. For this configuration, connect
pin 2 to pin 1 on the XL, and connect the high to pin 3.
Figure 12 below shows the recommended method of connecting the
Model SSM's unbalanced jack to a balanced device.
Balanced to
Unbalanced
Connections
56