JL Audio Fathom f110 - Manual (Page 19)

Page 19 | Fathom f110
Unbalanced Inputs
Th e Fathom subwoofer features individual left and right unbalanced RCA-
type input connectors. Th ese are the most commonly used connectors for home
audio applications and must be used if your receiver or preamplifi er/processor
does not provide balanced outputs. While unbalanced connections are not as
noise-immune as a balanced connection, Fathom 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. Th is applies to most
modern multi-channel receivers and preamplifi er / processors. Separate left and
right RCA-type input jacks are provided for systems without a dedicated mono
subwoofer connection. Th
is 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. Fathoms 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
IMPORTANT: IF NOISE EXISTS AFTER CONNECTION, FATHOMS 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.