REL CONNECTIVITY Always switch off your

REL CONNECTIVITY
Always switch off your system before disconnecting any wires. To increase connection versatility,
REL subs have one high-level and two low-level inputs: A Neutrik Speakon socket and two RCA
phono sockets. This is to facilitate use with various system configurations. The high-level,
unbalanced, dual-channel stereo input uses a Neutrik Speakon connector that is connected to the
power amplifier’s left and right channel speaker terminals. This has the advantage of ensuring that
the REL receives exactly the same signal as the main speakers. In this way, the character of the bass
from the main system is carried forward into the sub-bass. This is a very important point and
together with REL’s Input and Filter Circuitry ensures far superior system integration of the sub-bass
with the main system. There is one RCA connection for line level connection to the output of a
stereo preamplifier or receiver. Another single RCA connection permits connection to the .1/LFE
output of a home cinema amplifier or processor.
The .1/LFE circuit is a dedicated channel used ONLY on AV processors or receivers fitted with Dolby
Digital 5.1 or 7.1 systems. It is intended to provide theater lovers with a special Low Frequency
Effects channel to better convey the director’s intent.
HIGH-LEVEL and .1/LFE inputs can and should be used simultaneously to achieve the best effect. The
benefits are two-fold when used with a home cinema system. The .1/LFE input reproduces the .1
Sub/LFE channel and the high-level connection underpins the main front speakers thereby turning
these into truly full range devices. Hint: The main front speakers must be set to ‘Large or Full Range’
operation on the processor, otherwise the main speakers will not receive the full range of bass
intended for these channels and that your REL requires to properly operate.
CONNECTING TO THE POWER AMPLIFIER USING THE SPEAKON HIGH-LEVEL INPUT
To engage the Neutrik Speakon plug, insert fully into socket and rotate clockwise until locked. To
remove the Neutrik Speakon plug, grip body of plug, place thumb on chrome lever, move lever
backwards, rotate plug anti-clockwise quarter turn and withdraw.
STANDARD CONNECTION
The standard high-level hookup procedure is: attach the red wire to the amplifier’s right positive
speaker output terminal; attach the yellow wire to the amplifier’s left positive speaker output
terminal; attach the black wire to whichever of the amplifier’s ground output terminals is
convenient; plug the Speakon connector into the Sub-Bass System’s high-level input.
For differential (i.e. fully balanced) amplifiers using one REL, simply use the standard connecting
scheme with the exception of connecting the black wire to chassis ground (i.e. a metal bolt or screw,
preferably not painted or anodized, on the chassis of the power amp or receiver), not to a negative
speaker terminal, and then connecting into the HIGH-LEVEL INPUT on the REL.
If connecting two RELs in a stereo configuration, connect the black wire of each REL to the negative
speaker terminal of the corresponding amplifier channel; twist together the red and yellow wires of
each REL separately and connect each pair to the positive speaker terminal of the corresponding
amplifier channel.
If connecting a single REL as a dedicated center channel sub, connect the black wire of the REL to the
negative center channel speaker terminal; twist together the red and yellow wires and connect this
pair to the positive center channel speaker terminal.
If connecting a REL as a dedicated rear channel sub, connect the black wire of the REL to either the
left rear or right rear negative speaker terminal; connect the yellow wire to the left rear positive
speaker terminal; connect the red wire to the right rear positive speaker terminal.
CONNECTIVITY SPECIFIC TO GIBRALTAR AND MULTIPLE GIBRALTAR SUBWOOFERS
Gibraltar has two separate stereo inputs: A Neutrik Speakon socket and two phono sockets. This is to
facilitate use with various system configurations.
The high-level, unbalanced, dual-channel stereo input uses a Neutrik Speakon connector that is
connected to the power amplifier’s left and right channel speaker terminals. This has the advantage
of ensuring that the REL receives exactly the same signal as the main speakers. This means that the
character of the bass from the main system is carried forward into the sub-bass. This is a very
important point and together with REL’s Active Bass Controller (ABC), ensures far superior system
integration of the sub-bass with the main system. There are two RCA sockets for low-level
connection to the output of a stereo preamplifier or receiver. Another single RCA socket connects to
the .1/LFE output of a home cinema amplifier or processor.
HIGH-LEVEL and .1/LFE inputs can be used simultaneously. The benefits are two-fold when used with
a home cinema system. The low-level input reproduces the .1 Sub/LFE channel and the high-level
connection underpins the main front speakers. The main front speakers should be set to the ‘large’
option on the processor.
CONNECTING MULTIPLE GIBRALTAR’S
For higher levels of low-frequency output, you may want to use multiple Gibraltar units. To facilitate
this, the Gibraltar uses a rear panel high-level connector to “daisy chain” units when stacked
vertically or placed next to each other. This connectivity allows for the same amplifier output signal
to easily feed multiple sub-bass systems. Simply use the optional cable (Speakon-to-Speakon) to
connect from the “HIGH-LEVEL OUTPUT” of the first sub-bass system to the “HIGH-LEVEL INPUT” of
the second unit. When “daisy chained” each sub-bass system retains its autonomy and each will
need to have its output level, crossover point, phase, etc. adjusted individually. This arrangement
provides unrestricted flexibility for in-room integration and fine-tuning of all audio parameters.
For multi-channel home cinema systems, the same procedure is followed except a phono-to-phono
cable is also used to connect the first sub-bass system “.1/LFE OUTPUT” to the “.1/LFE INPUT” of the
second unit. As is typical for REL, both high-level and .1/LFE inputs can be used together and
adjusted independently offering the ability to blend both signals to your taste. To protect Gibraltar ’s
fine furniture grade cabinetry when stacking, optional rails with felt coverings that replace the metal
feet are available. The kit contains all hardware necessary to attach the rails, as well as a Speakonto-Speakon cable for daisy-chaining.
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