Features
Controls
Connections

Features

Four-Channel Full-Range Amplifier: The JL Audio 450/4v2 is a class A/B four-channel, full-range amplifier that is rated at 150 Watts RMS  for channels 1 & 2 and 75 Watts RMS  for  channels 3 & 4 in 1.5 to 4-ohm at 20 to 20kHz with a signal-to-noise-ratio of 108.5 dB and a total harmonic distortion of 0.03% while receiving 11 to14.5 Volts. In addition, the amplifier's 1 & 2 channels can  be bridged to output 300 Watts RMS x 1 in 3 to 8-ohms while channels 3 & 4 can be bridged to output 150 Watts RMS x 1 in 3 to 8-ohms .

R.I.P.S.(Regulated, Intelligent Power Supply): R.I.P.S. stands for "Regulated, Intelligent Power Supply" and is a central feature of the JL Audio's Slash v2 amplifier. The JL Audio R.I.P.S. System ensures consistent power delivery over a wide range of battery voltages and load impedances. This technology provides optimum power at any impedance level between 1.5 ohm to 4 ohm per channel and at any vehicle voltage level between 11V and 14.5V.

• Regulated Power Supply: "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 allows the JL Audio Slash v2 amplifier's the rail voltage and clean power output to remain stable in real-world car-audio systems, resulting in superior fidelity and stability.
• Intelligent Power Supply: 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). The R.I.P.S. System detects the actual impedance being driven and adjusts output rail voltages 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 your car-audio system, rather than relying on often inaccurate assumptions based on a speaker's rated impedance.

Monolithic RealSink Plus Advanced Heat Management: This Slash v2 amplifier features a real cast-aluminum heat sink with vertically-oriented fins that are highly effective at dissipating heat from the amplifier via convection and radiation. The design of this heat sink is achieved through extensive finite-element analysis, resulting in an amplifier that keeps cool under the most demanding conditions. If a Slash v2 amplifier should ever reach an unsafe temperature, our unique Advanced Rollback Protection circuit also adjusts power until the amplifier cools down, without ever shutting your music down. As an added cosmetic benefit, the cast-aluminum end-caps of the Slash v2 amplifier replicate one-half of a full heat sink fin so that when two or more amplifiers are mounted end-to-end, you get a totally seamless custom look.

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.

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 Slash v2 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.

Flexible Preamp Outputs: The 450/4v2 features pass-through preamp outputs which can take their input from either amplifier channel pair (1&2 or 3&4) or from the sum of both channel pairs. 

Protection Circuitry With Status Indicator Lights: There are three status indicator lights on the top of the amplifier.

• Power (Green): This LED lights green to indicate that the amplifier is turned on and operating normally.
• Thermal (Red): This Red LED lights to indicate that the amplifier has exceeded its safe operating temperature, putting the amplifier into a shelf-protection mode, which reduces the power output of the amplifier. The red light will shut off and the amplifier will return to normal, full-power operating mode if the heat sink temperature drops back to a safe level.
• Low Ohm (Amber): This amber LED lights to indicate that the impedance of the speaker load connected to the amplifier is lower than the optimum impedance load range for the amplifier. When this light is on, a protection circuit engages and reduces the power output of the amplifier. The amber indicator will also light when a short-circuit is detected in the speaker wiring.

Controls

Input Mode: The JL Audio amplifier is equipped with an Input Mode switch which allows you to connect the amplifier from your headunit with a single pair (2ch) or two pair (4ch) of RCA cables. In the 2ch mode the amplifier will route the signals connected to the channel 1 & 2 inputs to the 3 & 4 channel inputs as well. In the 4ch mode there is a separate pair of RCA cables connected to the 1 & 2 channels inputs and the 3 & 4 channel inputs allowing for front and rear fading adjustments.

Simplified Gain Setting: The amplifier's R.I.P.S. feature also allows for easy gain setup. Because the amplifier will always deliver the same amount of power within its operational range of impedances and supply voltages, the maximum, unclipped output is very predictable. This makes setting the gain level of the amplifier 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).

Active Crossover: The Slash v2 amplifier provides a comprehensive crossover network to fine tune your system effectively and accurately. The variable filter design employed in the Slash v2 amplifier crossover sections allow you to seamlessly switch slopes, easily change filter frequencies and address what frequencies the preamp outputs will pass. The 450/4v2 offers the following independent crossover adjustments for the 1 & 2 and 3 & 4 channels.

• 1 & 2 Channels:
  • Filter Type: The amplifier features a variable Low-Pass, variable High-Pass or Bandpass filter mode for the amplifier's 1 & 2 preamp input section.
  • Filter/Slope Mode: The amplifier offers a12dB/octave Butterworth or 24dB/octave Linkwitz-Riley alignments allowing for more precise integration of subwoofer and speaker channels. You can also select "Off" which allows the full range of frequencies to be present at the inputs to feed the 1 & 2 channels.
  • Variable Frequency: Fully-variable frequency selection from 50-500 Hz on full-range channel filters with frequency range switch in "x1" position. Selecting "x10" on the frequency range switch multiplies the filter frequency times ten to allow cutoff frequencies between 500 - 5000 Hz.
• 3 & 4 Channels:
  • High-Pass Filter: The amplifier's 3 & 4 channel input section features a High-Pass Filter which can be set to 12dB per octave, 24dB per octave or Off (full-range).
  • Variable Frequency: Fully-variable frequency selection from 50-500 Hz on full-range channel filters with frequency range switch in "x1" position. Selecting "x10" on the frequency range switch multiplies the filter frequency times ten to allow cutoff frequencies between 500 - 5000 Hz.

  Note: The Bandpass Filter for channels 1 & 2 is derived from the Bandpass filter frequency setting of channels 1 & 2 and the High Pass Filter frequency setting of channels 3 & 4. This creates a true bandpass filter well suited for driving mid-bass or mid-range speakers in a tri-amplified system.

Bass Controls: The amplifier features Bass Control functions for channels 1 & 2.

• Bass EQ: The amplifier is equipped with a fixed bass boost of +6dB centered at 48 Hz which can be turned "on" or "off".
• Infrasonic Filter: This filter is a defeatable 24dB/octave infrasonic filter with a fixed cutoff frequencies of 30 Hz. Ultra-low frequencies that cannot be reproduced by a subwoofer do not become sound but become unnecessary oscillations, which affect sound by causing distortion. These frequencies also waste amplifier power and can cause damage to speakers. Activating the Infrasonic filter switch cuts the frequencies below the respective frequency (30Hz) to improve the reproduction performance of the speakers by eliminating harmful distortion.
• 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 (0-15dB) from the front of your vehicle. The optional wired Remote Bass Control operates channels 1 & 2 only.

Connections

Power and Ground: The JL Audio amplifier's set-screw Power and Ground connections are designed to accept 4 AWG power wire.

Remote Turn-On: The Slash v2 amplifier's set-screw turn-on lead will accept 18 to 8 AWG  wire.

Speaker Outputs: The 450/4v2 amplifier's eight set-screw speaker terminals will accept 16 to 8 AWG speaker wire.

Preamp Inputs: The amplifier features two sets of differential-balanced RCA jack inputs. The amplifier's input level can be set independently for the front and rear channels 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 preamp outputs so you can send audio to another amplifier in your system. The preamp output is switchable and can be set to output the audio signal from the 1 & 2 channels, 3 & 4 channels or the sum of all four channels.