3-3
Rev 2.2, 10/31/94
3.4 Polarity Convention
The 601 uses the international standard polarity convention of pin 2 hot. Therefore:
3.5 Input and Output Connections
Figure 3-1 illustrates how to connect the 601 to balanced and unbalanced analog sources and
analog loads.
To operate the 601 from unbalanced sources, run a 2-conductor shielded cable (that's two
conductors plus the shield) from the source to the 601. At the source, connect the low/minus
side to the shield, these connect to the source's ground; connect the high/plus side to the
source's signal connection. At the 601, the high/plus wire connects to pin 2, the low/minus
wire connects to pin 3, and the shield (always) connects to pin 1. This is the preferred method
as it makes best use of the 601's balanced input (even though the source is unbalanced). The
other alternative shown in Figure 3-1 converts the 601's balanced input into an unbalanced
input at the input connector. This works, but is more susceptible to hum and buzz than the
preferred method. There is no level difference between either method.
You can drive unbalanced loads with the 601's outputs by using the XLR connector with pin 3
left open. In an emergency (the show must go on), you can ground pin 3, but if you have the
choice...leave it open. If you must ground pin 3, it is must be grounded at the 601, rather than
at the other end of the cable. The price, regardless of whether or not pin 3 is grounded is 6 dB
less output level. This can be easily made up via the output gain controls. If your system is
wired with pin 3 hot,
pin 2 must float
if you are driving an unbalanced load.
If your system uses balanced inputs and
outputs, and uses the 601 this way, then the
polarity convention is unimportant. If your
system is both balanced and unbalanced, then
you must pay attention to this, especially when
going in and coming out through different
connector types (like input on an XLR, output
on a phone jack).
XLR
Tip-Ring-
Sleeve
Signal
1
Sleeve
Ground
2
Tip
High
3
Ring
Low
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