Speck Electronics ASC - Manual (Page 21)

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Two types of input connectors are available on the ASC; a standard 1/4"
TRS balanced jack and a female XLR connector. These inputs are
internally wired in parallel and identical in every aspect except for the
connector.
The 1/4” jack will accept a balanced TRS plug or a mono TS unbalanced
plug. For unbalanced operation a standard mono plug should be used. A
legend on the rear panel can be used as a guide for the proper
configuration of input and output connectors.
Two types of output connectors are available on the ASC; a standard 1/4"
TRS balanced jack and a male XLR connector. These connectors are
internally wired in parallel except on the transformer output version. (See
item 19 on the “Transformer Option”)
When depressed, this switch disconnects the ground of the ASC from pin
1 of the balanced XL output connector thereby inducing any piece of gear
interfaced to this connector to search out a ground path external to the
Model ASC. This can reduce the chance of ground loops and eliminate
unwanted hums or buzzes.
A few words about hums, buzzes, and the role of a ground lift.
Not to suggest that the reasons for hums in an audio system can’t be
explained…they can… but the explanation, cure, and costs are very often
out of the reach of the average project studio. This is why manufacturers
sometimes include a ground lift switch on their products. It just saves you
the trouble of clipping or soldering ground wires on your cables.
REAR PANEL
16. Input Connectors
17. Output Connectors
Chapter 3 Operation Section
OUTPUT INPUT
GND
LIFT
BAL. XLR BAL. ¼ UNBAL.¼
HIGH
GND
LOW
PIN 2
PIN 3
PIN 1 TIP
RING
SLEEVE
TIP
SLEEVE
17 18
18. Ground lift Switch
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