Mono Subwoofer Amplifier: The JL Audio 1200/1v3 is a class D
monoblock subwoofer amplifier. With its regulated power supply, the rated output
is 1,200 Watts RMS x 1-channel into a load of 1.5Ω to 4Ω, with an input
voltage of 11V to 14.5V. The signal to noise ratio is >95 dB and a total
harmonic distortion is <0.05%, both measured at rated power (1,200 watts RMS).
The amplifier's frequency response is 5-250Hz. (It is not designed for driving
full range speakers.)
R.I.P.S. (Regulated Intelligent Power Supply): The JL Audio
R.I.P.S. system ensures consistent power delivery over a wide range of battery
voltages and load impedances, providing the rated power output at any impedance
from 1.5Ω to 4Ω and at any vehicle voltage from 11V to 14.5V.
- Regulated Power Supply: The power
supply adjusts to maintain the amplifier's rated power
output and low distortion operation over a wide range
of vehicle voltages (11V-14.5V), so the amplifier's
output remains stable in real-world car audio
- Intelligent Power Supply: An Intelligent
circuit monitors output current to optimize the amplifier's
output power over a wide range of load impedances (1.5Ω
to 4Ω). The R.I.P.S. System detects the actual load
impedance, rather than relying on often inaccurate assumptions
based on a speaker's rated impedance, and adjusts output rail
voltages to deliver consistent output.
RealSink Heat Management: This Slash v3 amplifier features
a real cast-alloy heat sink with vertically-oriented fins, very effective at
dissipating heat from the amplifier via convection and radiation. This design
is achieved through extensive finite-element analysis, resulting in an amplifier
that keeps cool under the most demanding conditions. As an added cosmetic benefit,
the cast-aluminum end-caps replicate half of a heat sink fin so that when two or
more amplifiers are mounted end-to-end, you get a seamless custom look.
Advanced Rollback Protection: If a Slash v3 amplifier should
ever reach an unsafe temperature, the Advanced Rollback Protection circuit reduces
power until the amplifier cools down, without turning the music off completely.
Class D Circuitry: JL Audio's Patented Class D output circuit
utilizes a discrete control section and a unique feedback loop design, resulting
in a damping factor greater than 500 at 4Ω (>250 at 2Ω), higher than
most other Class D and Class A/B designs. The benefit is tight, clean bass
reproduction with the efficiency advantage of Class D.
Differential-Balance Inputs: The 1200/1v3 features
differential-balanced input architecture to reject noise and ensure
compatibility with a wide variety of source units, including many OEM
systems. Without using a line output converter, you can connect most
OEM or aftermarket source units to the amplifier without creating
any noise or compatibility issues.
Note: You will need a speaker wire to RCA adaptor (item
136XDCLR2S, sold separately) when using a speaker-level input.
Preamp Outputs: The preamp outputs make connecting multiple
amplifiers simple. The 1200/1v3 features an independent crossover for the preamp
output with frequency (40-200 Hz), mode (Full Range, LP, or HP) and slope (12 or
24 dB) adjustments.
Protection Circuitry With Status Indicator Lights: There are
four status indicator lights on the top of the amplifier:
- Power (Green): green LED indicates the
amplifier is turned on and operating normally
- Thermal (Red): red LED indicates the
amplifier has exceeded its safe operating temperature; the
power output is reduced until the heat sink temperature drops
back to a safe level
- Low Ω (Amber): amber LED indicates
the impedance of the connected speaker(s) is lower than the
optimum impedance range for the amplifier and the power output
is reduced; the amber LED can also indicate a short in the
- Low V (Blue): blue LED indicates a drop
in supply voltage below 8 volts; the LED will remain lit longer
than the duration of the voltage drop to alert you to the problem;
in this situation the amplifier will also shutdown (and the green
LED turns off); once the voltage rises above 9 volts, the amplifier
will turn itself back on
Infrasonic Filter: Ultra-low frequencies that cannot be reproduced
by a subwoofer do not become sound, but unnecessary oscillations which affect sound by
causing distortion. These frequencies also waste amplifier power and can cause damage
to speakers. Using the infrasonic filter, variable from 15 Hz to 60Hz, removes the
signal below the setting to improve the performance of the speakers by eliminating
harmful distortion. The infrasonic filter can be turned off.
Simplified Gain Setting: The amplifier's R.I.P.S. feature allows
easy gain setup. Because the amplifier always delivers the same output power within
its operational range of load impedance and power supply voltage, the maximum,
unclipped output is predictable. This makes setting input gain very simple; you'll
need a Digital AC Voltmeter (sold separately) and a CD with a sine-wave bass test
tone recorded at 0 dB reference level (item number503CD104,
sold separately). In addition to the continuously variable rotary gain control,
the Input Voltage switch adjusts the gain range, set to Low (200mV-2V) or High
Low Pass Crossover: The built-in crossover allows you to adjust
the frequency and filter slope of the amplifier's powered output:
- Mode/Slope Switch:
- Off: crossover is bypassed, useful
when using an external crossover; in this position the
Advanced Bass Control is defeated
- 12 dB: filter slope is 12 dB/octave,
often used when the subwoofer is in the trunk of a sedan
- 24 dB: filter slope is 24 dB/octave
- Frequency: crossover frequency variable
from 40 Hz to 200 Hz; the detented potentiometer allows accurate
Preamp Output Crossover: An independent crossover address what
frequencies the preamp outputs will pass:
- Output Mode:
- Full Range: the preamp output is the
same as the amplifier's input; the signal is not affected
by the Advanced Bass Control
- Amp Filter: the preamp output signal
is the same as the amplifier's powered output, governed by
the Low Pass Crossover and Advanced Bass Control
- Out Filter: the independent crossover
controls affect the preamp output:
- Filter Slope: 12 dB/octave or 24
- Filter Mode: Low Pass or High Pass
- Filter Frequency: crossover frequency
variable from 40 Hz to 200 Hz; the detented potentiometer
allows accurate adjustment
Advanced Bass Controls: The bass control functions on the
- Variable Bass Boost: The amplifier's
variable bass boost features a single band parametric
equalizer with variable Q (0.5 - 4.3), center frequency
(20 Hz to 80 Hz), and boost (0 to +15dB).
- Infrasonic Filter: The 24dB/octave
infrasonic filter has a variable crossover point (15 Hz
to 60 Hz). The infrasonic filter can be turned off.
- Remote Bass Port: The amplifier is equipped
with a connection for an optional wired Remote Bass Control (item number136RBC1,
sold separately), allowing boost control from the front of
Output Polarity: Depending on the distance between the
mid-bass speakers and the subwoofer in your system, it might be preferable to
reverse the polarity of the subwoofer to produce a better transition between the
two. The Output Polarity switch allows you to quickly reverse the subwoofer's
Power and Ground: The amplifier's set-screw Power and Ground
connections accept up to 4-gauge wire (4-gauge minimum is recommended).
Note: The Amplifier is not equipped with
a fuse. An external 100-amp fuse (not included) must be
installed on the power wire. If the system has only this
amp and a wiring kit is used that includes a fuse with a
value other than 100-amps, the original should be replaced
with a 100-amp fuse.
Speaker Output Terminals: The two pair of set-screw speaker
terminals accept 12-gauge to 8-gauge wire. The terminals are internally shorted
together, making it easy to connect two subwoofers.
Remote Turn-On: The set-screw turn-on lead terminal will
accept 12-gauge to 8-gauge wire.
Note: If your headunit does not have a
dedicated remote turn-on output, the amplifier's turn-on
lead can be connected to a switched +12V volt circuit.
Preamp Inputs: The amplifier features one set of
differential-balanced RCA 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 higher voltage preamp or speaker-level signal.
Preamp Outputs: The amplifier also features one set of preamp
outputs so you can send audio to another amplifier in your system. The preamp output
can be full range, or the built-in crossover can be applied.
Note: All inputs, outputs and controls are
located on the front side of the amplifier to make installation
simple and neat.