JL Audio f212 Speaker User Manual


 
Page 19 | Fathom f212
Unbalanced Inputs
e Fathom subwoofer features individual le and right unbalanced RCA-
type input connectors.  ese are the most commonly used connectors for home
audio applications and must be used if your receiver or preampli 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 “Le or Mono” will be used.  is applies to most
modern multi-channel receivers and preampli er / processors. Separate le and
right RCA-type input jacks are provided for systems without a dedicated mono
subwoofer connection.  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.