Monoblock Class D Subwoofer Amplifier, 1200 W x 1 @ 1.5-4 Ω
This high-powered icon has made its mark over a decade-long production run, thanks to its prodigious real-world power delivery, fidelity and ruggedness.
Efficient Class D technology with a patented control circuit and JL Audio's signature R.I.P.S. power supply design ensure full power delivery (1200 W) over a wide range of load impedances and vehicle voltages.
The 1200/1v3 also boasts a very complete set of signal processing features, including a parametric bass EQ and fully variable infrasonic filter.
This amplifier features an all-black look that is pure, sexy evil, including the powder-coated cast alloy heat sink and end caps.
R.I.P.S. – Regulated, Intelligent Power Supply
The remarkable R.I.P.S. System ensures consistent power delivery over a wide range of battery voltages and load impedances.
R.I.P.S. stands for "Regulated, Intelligent Power Supply" and is a central feature of JL Audio's 'Slash' and HD amplifiers.
"Regulated" means that the power supply adjusts its operation so as to maintain the amplifier's rated power output and low distortion operation over a wide range of vehicle voltages (11V-14.5 V). This contrasts with conventional, "unregulated" power supplies, which allow rail voltages to sag in direct proportion to drops in the supply voltage. This can result in significant power losses when battery voltage decreases, even if those voltage dips are short in duration. This manifests itself audibly as increased distortion. With a JL Audio R.I.P.S.-equipped amplifier, the rail voltage and clean power output remain completely stable in real-world systems, resulting in superior fidelity and stability.
The "Intelligent" portion of the R.I.P.S. System is a circuit that actually monitors output current to optimize the amplifier's output power over a wide range of load impedances (1.5 ohm to 4 ohm per channel).
Conventional amplifiers are designed to produce optimum power at a particular impedance (2 ohms, for example). When asked to run above that impedance (say, 4 ohms), these amplifiers lose power (half their power from 2 ohms to 4 ohms). This will not happen with a JL Audio HD or 'Slash' amplifier because the R.I.P.S. System detects the actual impedance being driven and adjusts the amplifier's operation to deliver optimum output. The entire process is seamless, automatic, and results in incredible dynamics for satellite channels and consistent power output for a wide range of subwoofer configurations. It also takes into account the real impedance of the system, rather than relying on often inaccurate assumptions based on a speaker's rated impedance.
The bottom line: Optimum power, at any impedance between 1.5 ohm and 4 ohm per channel, at any vehicle voltage between 11V and 14.5V.
Advanced Rollback Protection
JL Audio's exclusive Advanced Rollback Protection circuit monitors the amplifier's thermal condition and adjusts amplifier operation to eliminate annoying amplifier shut-down events.
Should a JL Audio amplifier equipped with Advanced Rollback Protection reach an unsafe operating temperature, a special circuit rolls back peak power output, without changing gain, until the amplifier cools down to a safe operating temperature. The condition is generally indicated by a red “Thermal” or “Status” LED state. On VXI amplifiers, the LED ring will flash red. Once the amplifier cools down, the circuit restores full peak power output and the indicator reverts to its normal state. The operation of Advanced Rollback Protection is inaudible in most cases, but it ensures that your music keeps on playing, even under the most demanding conditions.
Patented Class D Circuitry (U.S. Patent #6,441,685)
Our Patented Class D amplifier circuit delivers high efficiency without sacrificing fidelity.
While Class D amplifiers are well known for outstanding efficiency, they have also been known for less than spectacular sound quality due to weak damping of the driven load and poor power regulation. These factors are critical to subwoofer fidelity as they relate directly to the amplifier's ability to control the motion of the speakers.
JL Audio's Patented Class D output circuit utilizes a discrete control section and a unique feedback loop design that results in outstanding power regulation and a damping factor greater than 500 at 4 ohms (>250 at 2 ohms). This is vastly higher than other Class D designs and also higher than most Class A/B amplifiers. The benefit of this exclusive JL Audio technology is tight, clean bass reproduction with the efficiency advantage of Class D.
It is a package tailor-made for serious bass performance.
Vertical, cast alloy fins effectively dissipate heat, without resorting to noisy fan-cooling.
Most car audio amplifiers rely on big lumps of metal that do a good job of storing heat, but not such a great job of getting rid of it. RealSink™-equipped JL Audio amplifiers feature real cast-alloy heat sinks with vertically-oriented fins. This design is far more effective than the lump-of-metal approach, utilizing the physics of convection and radiation to more effectively exchange heat with the surrounding air. The design of these heat sinks was refined through extensive finite-element analysis, resulting in amplifiers that keep their cool under the most demanding conditions.
JL Audio’s Differential-Balanced Inputs are engineered to combat induced cable noise, which is a common problem in car and marine audio installations. This technology allows for the use of conventional RCA cables, while delivering many of the benefits of a true balanced connection and accepting a wide range of input signal levels.
Today’s vehicles are equipped with sophisticated electronics capable of generating noise and interference that can intrude into the audio path, ruining the listening experience.
Most audio equipment uses single-ended, ground-referenced RCA jacks to receive audio signals. This means that the RCA shield is connected directly to signal ground. This is a simple, cost effective input design that works well for short runs in noise free environments. In noisier environments, this method cannot reject the common mode noise that could be on both RCA conductors (shield and center conductor).
By having more than one chassis-grounded RCA shield on a device, single-ended input designs are also more susceptible to ground loops. If noise is present on both conductors while the shield is connected to ground, the input amplifier will amplify the noise relative to the grounded RCA shield. When there are multiple RCA connections or any other conductors subjected to a magnetic field, this will cause a difference in potential across the RCA loop to be amplified at the grounded RCA as noise (a classic ground loop).
JL Audio’s Differential-Balanced Input circuits measure the center pin of the RCA connection relative to the RCA shield, even when the shield is not connected to ground, and even when the voltages at both conductors are moving relative to ground. Because both the center conductor and the shield see high impedance to ground at the input, a ground loop cannot be formed, as there is no current flow to induce a voltage as noise. This works equally well with differential-balanced, or unbalanced signal sources, making this input architecture compatible with all standard car and marine audio equipment, using standard, unshielded, twisted-pair RCA cables. No special cables are required, unlike the fully balanced connections used in professional audio.
Another benefit of the Differential-Balanced Input design is that it easily accepts low-level and high-level signals from a variety of factory head unit outputs and amplifiers, including single ended “ground referenced” sources, as well as Balanced or Unbalanced “Bridged or BTL” sources. This eliminates the need for Line Output Converters (LOCs) in most installation scenarios.
The obvious question is: “Why don’t all car audio amplifiers use Differential-Balanced Inputs?” The answer is simple: it costs more. Executing a proper differential-balanced input section requires more components and better quality components than a basic single-ended design, so you generally won’t find them on less expensive amplifiers.
Rated Continuous (RMS) Power @ 14.4 V
@ 4 Ω - 1200 W RMS x 1
@ 3 Ω - 1200 W RMS x 1
@ 2 Ω - 1200 W RMS x 1
@ 1.5 Ω - 1200 W RMS x 1
Rated Continuous (RMS) Power @ 12.5 V
@ 4 Ω - 1200 W RMS x 1
@ 3 Ω - 1200 W RMS x 1
@ 2 Ω - 1200 W RMS x 1
@ 1.5 Ω - 1200 W RMS x 1
Frequency Response - 5 Hz - 250 Hz (+0, -1dB)
S/N Ratio, referred to highest rated power - >95 dB below rated power (A-weighted, 20 Hz - 20 kHz noise bandwidth)
S/N Ratio, referred to 1 W (Main Channels) - >65 dB (A-weighted, 20 Hz - 20 kHz noise bandwidth)
Damping Factor @ 4 Ω - >500 / 50 Hz
Damping Factor @ 2 Ω - >250 / 50 Hz
THD+N @ Rated Power (Main Channels) - <0.05% @ 4 Ω
Input Voltage Range @ RCA Inputs - Switchable from 200 mV - 2 V RMS (Low) to 800 mV - 8 V RMS (High)
Min.Copper Power / Ground Wire Gauge - 4 AWG wire
Fuse Rating - 100 A (AFS, AGU or MaxiFuse™)
Filter Mode(s) - Low-Pass only
Filter Slope(s) - 12/24 dB/octave
Filter Frequency Range - 40 Hz - 200 Hz
Detented, Calibrated Filter Freq. Potentiometer - Yes
Filter Defeat Function - Yes
Infrasonic Filter - Variable, Defeatable
Bass Boost EQ - Parametric
Output Polarity Switch - Yes
Remote Subwoofer Level Control - No
Remote Bass EQ Boost Control - Optional (RBC-1)
Pass-Through Preamp Output - Buffered, w/independent filter
Height (H) - 2.36 in / 60 mm
Width (W) - 19.7 in / 500 mm
Depth (D) - 9.25 in / 235 mm
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