JL Audio Fathom IWS-SYS-2 Owner's Manual page 17

IMPORTANT
| Fathom IWS
Unbalanced Inputs
The Fathom IWS subwoofer amp features individual left and right unbalanced
RCA-type input connectors. These are the most commonly used connectors
for home audio applications and must be used if your receiver or preamplifier/
processor does not provide balanced outputs. While unbalanced connections are
not as noise-immune as a balanced connection, Fathom IWS subwoofers employ
optical isolation on the unbalanced inputs to minimize the possibility of noise in
your system.
For systems with a mono subwoofer or "LFE" channel connection, only
the RCA-type jack labeled "Left or Mono" will be used. This applies to most
modern multi-channel receivers and preamplifier / processors. Separate left and
right RCA-type input jacks are provided for systems without a dedicated mono
subwoofer connection. This typically applies to two-channel audio equipment.
Technical Notes:
• When balanced outputs are not available on the signal source, you must use
the RCA-type unbalanced inputs. Fathom IWSs feature optical isolation
circuitry on the unbalanced inputs to minimize the likelihood of ground
loop induced noise. Unbalanced input impedance is 10 kohms.
• Connections are industry-standard for unbalanced signal cables as follows:
RCA-type connection:
Tip: Positive
Sleeve: Negative
IMPORTANT: IF NOISE EXISTS AFTER CONNECTION, Fathom IWS AMPS
ALLOW FOR GROUNDING OR ISOLATION OF THE UNBALANCED INPUTS.
PLEASE REFER TO THE "INPUT MODE SWITCHES" SECTION ON PAGE 20 OF
THIS MANUAL FOR FURTHER INFORMATION ON MINIMIZING NOISE.
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