Boulder 3050 - Connecting to a Balanced Source; Connecting to an Unbalanced Source

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Getting Started
Getting Started
Connecting to a Balanced Source
To fully realize the sonic potential of your 3050 Mono Power Amplier,
use balanced connections. Balanced cables minimize interference from
magnetic and RF sources.
Connect your preamplier output to the input provided on the rear
panel of the 3050.
Connecting to an Unbalanced Source
Although the inputs are of the 3-pin type, an unbalanced source is
easily accommodated by using a special cable. This cable has an RCA
type connector on the source end, and a 3-pin connector for going to the
input of the 3050 Power Amplier.
The minus input (pin 3) should be wired to ground only at the RCA
connector. This brings the minus input reference of the 3050 to the
unbalanced source ground, thus reducing loops.
Another option for accommodating unbalanced sources is that of
the Boulder ABL2 Input Adapter. It converts a balanced input into an RCA
input right at the rear panel of the 3050.
Like the above cable, the minus input of the 3050 is connected to
the ground of the RCA connector. However, this minus side will then share
the shield wire with the chassis ground and will not have very good hum
rejection.