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Features
Inputs and Outputs Notes
Features
Four-Channel Full-Range Amplifier: The JL Audio A4300 is a class AB
full-range amplifier that is rated at 70 Watts RMS x 4-channel in
4 ohm at 20 to 20,000Hz with a signal-to-noise-ratio of 104 dB and a total
harmonic distortion of 1% while receiving 14.4 Volts or 45 Watts RMS x 2-channel
in 4 ohm with a total harmonic distortion of 0.08% while receiving 12.5 Volts.
The amplifier can be bridged to output 220 Watts RMS x 2-channel in 4-ohm at
14.4 Volts or 150 Watts RMS x 2-channel in 4-ohm at 12.5 Volts.
Absolute Symmetry A/B Circuitry: The JL Audio full-range amplifier
benefits from a patented technology called Absolute Symmetry to deliver amazing
fidelity with extremely low distortion over a wide range of load impedances. The
JL Audio amplifier features a revolutionary Class A/B circuit that employs
identical N-Channel MOSFET transistors for push and pull with true buffering
from the load impedance. This is accomplished via a patented circuit that
reverses the operation of one of the transistors in each pair to achieve
absolute power symmetry and extremely low distortion over a wide range of load
impedances.
Simplified Gain Setting: The A-Series amplifier makes setting the
gain level of the amp via the input sensitivity control very simple. All you
need is Digital AC Voltmeter (142TK12V, sold separately) and a Test CD Disc
(503CD104, sold separately) with a sine-wave test-tone recorded at 0 dB
reference level in the frequency range to be amplified for that set of channels
(50 Hz for subwoofer channels, 1 kHz for a midrange application).
Differential-Balance Inputs: The JL Audio amplifier features
differential-balanced input architecture to effectively control noise and ensure
compatibility with a wide variety of source units, including many OEM
systems. Without resorting to line output converters, you can directly connect
most OEM source units to the JL Audio amplifier without creating any noise or
compatibility issues. Unlike conventional single-ended inputs, the
differential-balanced design does not connect one side of the audio signal to
chassis ground. This eliminates any voltage sensitivity between one input
terminal and ground and greatly reduces the incidence of alternator whine in a
typical car audio installation. The A4300 amplifier provides range switching
on each of its inputs via the "Input Voltage" switch. This permits connection to
a wide range of source voltages while retaining excellent sensitivity setting
precision.
Note: You will need two speaker wire to RCA adaptors (136CLR2SW, sold
separately) to connect this amplifier to your headunit via speaker-level.
Flexible Preamp Outputs: The A-Series amplifier features one pair of
preamp outputs that make connecting multiple amplifiers simple. The A4300
features pass-through preamp outputs which can take their input from the
amplifier's 1 & 2 channels or from the sum of all four channels.
Input Mode: The A4300's input section allows you to send signal to the
amplifier section through the use of either two or four differential-balanced
inputs. You can either send four discrete channels into the amplifier by
connecting an RCA cable to each input of the amplifier from your headunit or
feed all four channels by using only two channels by connecting a set of RCA
cable from your headunit to only the amplifier's 1 & 2 inputs.
Active Crossover: The A-series amplifier provides a crossover network
to fine tune your system effectively and accurately. The A4300 offers the
following independent crossover adjustments for the 1 & 2 and 3 & 4 channels.
Filter Mode: The amplifier allows you to select either a Low
Pass, High Pass or Full-Range operation of the amplifier's 1 & 2 channels
and 3 & 4 channels.
Variable Frequency: You can set the amplifier's Low Pass or High
Pass crossover from 50 to 200 Hz for channels 1 & 2 and channels 3 & 4.
Bass Controls: The bass boost circuit of the A-Series amplifier offers
the following controls that only effect channels 3 & 4 of the amplifier.
Bass Boost: The amplifier is equipped with a fixed +6dB, 48 Hz
Bass Boost.
Remote Bass Port: The amplifier is equipped with a connection for
a wired Remote Bass Control (136RBC1, sold separately) that allows fully
variable boost control (0-12dB) from the front of your vehicle.
Advanced Rollback Protection: Should an A-series amplifier ever
overheat, its
intelligent, unregulated power supply reacts by limiting available peak voltage
until the amplifier returns to a safe temperature range. Likewise, if an
impedance lower than optimal for the amplifier is present at the outputs, the
A-series amplifier will roll back peak voltage to protect itself without
shutting down.
Note: There is only one condition that will shut down the
A-Series amplifier completely and that is if the battery voltage of your
vehicle drops below 10 volts.
Protection Circuitry With Status Indicator Lights: There are two
status indicator lights on the right side of the amplifier.
Power (Green): This LED lights green to indicate that the
amplifier is turned on and operating normally.
Protect (Red): The Protection LED lights Red to indicate the
amplifier's protection circuitry has been activated to prevent product
failure due to a short-circuit or a dangerously low impedance connected to
the amplifier's outputs.
Inputs and Outputs Notes
Left Side Of Amplifier:
Power and Ground: The JL Audio amplifier's set-screw Power and Ground
connections are designed to accept 8 to 4 AWG power wire.
Remote Turn-On: The A-series amplifier's set-screw turn-on lead will
accept 18 to 12 AWG wire.
Speaker Outputs: The A4300 amplifier's eight set-screw speaker terminals
will accept 16 to 8 AWG speaker wire.
Right Side Of Amplifier:
Preamp Inputs: The amplifier features two sets of differential-balanced
RCA jack inputs. The amplifier's input level can be set to Low (200mV-2V RMS)
when connecting the amplifier to a low-level preamp signal or set to High
(800mV-8V RMS) when connecting the amplifier to a high-level speaker signal.
Preamp Outputs: The amplifier also features one set of filtered
preamp outputs so you can send a filtered audio signal to another amplifier in
your system.
Remote Bass Port: The amplifier is equipped with a connection for a
wired Remote Bass Control (136RBC1, sold separately).
