Sunfire High Resolution Series User Manual page 14

Using the speaker-level inputs
If you are using a receiver which does
not have a subwoofer output or line-level
outputs (pre-outs), you can connect
its speaker outputs to the subwoofer's
speaker-level inputs. The front
speakers can still be
connected to your
receiver.
The subwoofer's
internal amplifier
supplies the power
to reproduce the low
frequency range. It
receives a sample of
the signal going to
your front speak-
ers. (An insignificant
fraction of your
receiver's
power is
transferred
to the
subwoofer).
There is no
need to use
the speaker-
level inputs
if you are
using a separate
preamplifier/processor and a
power amplifier. Such systems
are best connected using the
line-level inputs as shown in the
previous diagrams. However, if
you are using the line-level inputs
and there is a excessive amount
of noise or hum present, using the
speaker-level inputs may yield a
lower background noise level.
The subwoofer's two negative
posts are joined internally (com-
mon-grounded). Your receiver/pow-
er amplifer must also be internally
common-grounded or you cannot
use this connection. Contact the
manufacturer of your receiver to make
sure its outputs are common grounded.
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User's Manual