JL Audio E6450 - Manual (Page 5)

only information or the sum of the information
from both the right and left channels. In order to
achieve one of these options, configure the inputs
to that pair of channels in one of these two ways:
1) Left Channel Only or Right Channel Only
Information: If you wish to send a Left-only or
Right-only signal to a pair of the e6450’s channels,
use a “Y-Adaptor” to split the single channel signal
into both left and right RCA inputs (or parallel-
connect both positive and both negative high-level
input connections to a single channel source signal).
This option is useful when using one pair of the
e6450’s channels to drive left channel speakers only
and another pair of the e6450’s channels to drive
right channel speakers only.
When parallel-connecting both positive and both
negative high-level input connections as described
above, make sure to connect negative (–) wires to
negative (–) wires and positive (+) wires to positive
(+) wires.
2) Left + Right Channel Information: When
bridged and fed by a stereo input, a pair of the
e6450’s channels will automatically combine the left
and right channels into a summed mono (left +
right) channel.This option is useful when using a pair
of the e6450’s channels to drive a subwoofer
system or a summed mono center channel.
AMPLIFIER STATUS INDICATOR LIGHTS /
PROTECTION CIRCUITRY
There are two status indicator lights on the
input / control end of the amplifier:
I M P O RTA N T !
1) “Power” (Green): lights to indicate that the
amplifier is turned on and operating normally.
2) “Protect” (Red): lights or flashes to indicate
that the amplifier protection circuitry has been
activated to prevent product failure.
a) If the red “Protect” indicator lights steadily
(without flashing), the amplifier has exceeded its safe
operating temperature.This causes the amplifier to
shut off in order to protect its circuitry. When the
amplifier’s temperature drops to a safe level, the red
“Protect” indicator will shut off and the amplifier
will return to normal operation.
b) If the red “Protect” indicator flashes
intermittently, the protection circuitry has detected a
short-circuit or a dangerously low impedance
connected to the amplifier output(s). Connecting
the speaker outputs to an impedance lower than
2 Ω stereo (4Ω bridged) will cause this protection
mode to activate.The amplifier’s output may cycle
on and off when this protection mode is activated.
When the problem is eliminated, the amplifier will
return to normal operation.
SERVICING YOUR JL AUDIO AMPLIFIER
If your amplifier fails or malfunctions, please
return it to your authorized JL Audio dealer so
that it may be sent in to JL Audio for service.
There are no user serviceable parts or fuses
inside the amplifier.The unique nature of the
circuitry in the JL Audio amplifiers requires
specifically trained service personnel. Do not
attempt to service the amplifier yourself or
through unauthorized repair facilities.This will not
only void the warranty, but may result in the
creation of more problems within the amplifier.
If you have any questions about the installation or
setup of the amplifier not covered in
this manual, please contact your dealer or the
JL AUDIO Technical Department for assistance:
(954) 443-1100
9:00 AM – 5:30 PM Eastern Time,
Monday – Friday
JL AUDIO e6450 9
BASS BOOST CONTROLS
1) Bass Boost (Channels 5&6): This switch
allows the user to activate a 6 dB boost centered
at 48 Hz for channels 3&4. When the “Bass Boost”
in the “Channel 5 & 6 Controls” section is
activated, the inputs to “CH 5 (Left)” and “CH 6
(Right)” are summed to create a mono signal. The
“Filter Mode” switch in the “Channel 5 & 6” section
must be in the “LP” position for the bass boost to
be functional.
2) Remote Bass Port: This port allows you to
connect an optional remote boost knob (sold
separately, JL Audio Model RBC-1) that can be
mounted in the front of the vehicle. With the
RBC-1 connected, the boost is no longer limited to
0 or +6 dB, allowing a range of 0 - 12 dB of boost
to be selected.
SPEAKER OUTPUTS
The e6450’s speaker outputs are designed to
accept 8 AWG - 16 AWG wire.
Each pair of the e6450’s channels are designed
to deliver power into speaker loads equal to or
greater that 2 Ω when using a “stereo” configuration
and speaker loads equal to or greater than 4 Ω
when using a “bridged” configuration.
Speaker loads below 2 Ω nominal per channel
are not recommended and may cause the amplifier
to initiate a protection mode and shut itself off.
BRIDGING CONSIDERATIONS
Bridging is the practice of combining the output
of two amplifier channels to drive a single load.
When bridged, each channel produces signals of
equal magnitude, but opposite polarity.The
combined output of the two channels provides
twice the output voltage available from a single
channel.The e6450 has been designed for bridging
of its channel pairs without the need for input
inversion adaptors.
To bridge a pair of channels, use the “Left +” and
“Right –” speaker connectors only (the “Left –”
and “Right +” remain unused). When bridged, each
channel will deliver optimum power into a 4 Ω load.
When a pair of channels are bridged, they will
deliver 150W x 1 into a 4 Ω load or 90W x 1 into
an 8 Ω load. Operating a pair of bridged channels
into a load lower than 4 Ω is not recommended.
Because a bridged pair of channels requires that
both channels receive input, you need to connect
both left and right inputs to the source unit.
Connection of only one input will result in reduced
power output, increased distortion and can cause
the amplifier to overheat. Do not do this!
When a pair of the e6450’s channels are
operating in bridged mode, the output will be in
mono (only one channel).This mono channel can
contain right channel only information, left channel
I M P O RTA N T !
I M P O RTA N T !
8 JL AUDIO e6450