Specifications

CONNECTING AN UNBALANCED SOURCE
Although the inputs are all of the 3 pin type, an unbalanced source
is easily accommodated by using a special cable. This cable has an RCA
phono type connector on the source end and a 3 pin connector (for going
to an input) on the 810 Preamplifier.
The negative input (pin 3) should be wired to ground only at the
RCA phono connector. This brings the negative input reference of the
810 to the unbalanced source ground, thus reducing ground loops.
Another option for accommodating unbalanced sources is that of
the Boulder ABL input adapter. It converts a balanced input into a RCA
connector input right at the rear of the 810.
Like the above cable, the negative input of the 810 is connected to
the ground of the RCA connector. However, this negative side will then
share the shield wire with the chassis ground and will not have the best
hum rejection.
GETTING
STARTED
1-5
UNBALANCED INPUT CABLE
3-NEG INPUT
2-POS INPUT
1-GROUND