JL Audio MHD600/4-24V 4-Channel Marine Amplifier For 24-volt Systems — 150 Watts Rms X 4

About JL Audio MHD600/4-24V 4-Channel Marine Amplifier For 24-volt Systems — 150 Watts Rms X 4

Product info

• 4-channel marine amplifier for 24-volt systems
  • 150 watts RMS x 4 at 1.5 to 4 ohms
  • 300 watts RMS x 2 bridged at 3 to 8 ohms
• Class D amp design with Single Cycle Control and R.I.P.S. (Regulated, Intelligent Power Supply)
  • frequency response: 6-30,000 Hz
• variable high- and low-pass filter on front and rear channels (50-500 Hz, 12 or 24 dB/octave)
• differential-balanced inputs help eliminate noise
• removable power and speaker plugs

More info:

• optional wired remote for level control
• optional HD stacking kit for stacking multiple MHD amps together
• preamp and speaker-level inputs (speaker wire to RCA adapter required for speaker-level input)
• preamp outputs
• wiring, fuse, and hardware not included with amplifier
  • 8-gauge power and ground leads and a 25-amp fuse recommended
• dimensions: 10.71"W x 2.01"H x 10"D
• warranty: 1 years
• 30-day returns
• MFR # 010-03104-00
• Item # 13698227

Specs

Features

24V Marine Systems: The JL Audio MHD600/4-24V is a 4-channel, Class-D, marine amplifier designed specifically for 24V electrical systems.

• Note: The MHD600/4-24V must NOT be used in a standard 12 volt electrical system or damage may occur.

R.I.P.S. (Regulated, Intelligent Power Supply): The regulated power supply is stable over a range of impedance loads and input voltages.

• Regulated Power Supply: Regulated means the power supply adjusts its operation to maintain the amplifier's rated power output and low distortion operation over a wide range of vehicle voltages. The result is power stability in 24-volt systems.
• Intelligent Power Supply: The Intelligent portion of the R.I.P.S. System is a circuit that 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 impedance being driven and adjusts output rail voltages to deliver optimum output. This process is automatic and accounts for the real impedance of the speakers, rather than relying on often inaccurate assumptions based on a speaker's rated impedance.

Specifications:

• Power Output:
  • 4Ω: 150 watts RMS x 4 (22-29 volts)
  • 1.5Ω-3Ω: 150 watts RMS x 4 (22-29 volts)
  • Bridged (8Ω): 300 watts RMS x 2 (22-29 volts)
  • Bridged (3Ω-6Ω): 300 watts RMS x 2 (22-29 volts)
• THD at rated power: <0.03% @ 4Ω
• Signal to Noise Ratio:
  • At Rated Power: 110 dBA
  • At 1 Watt: 88.2 dBA
• Frequency Response: 6 Hz - 30 kHz (+0/-1 dB)
• Damping Factor:
  • 4Ω: >300 @ 50 Hz
  • 2Ω: >150 @ 50 Hz

Class D with Single-Cycle Control: The MHD600/4-24V utilizes a patented Single Cycle Control Class D technology. This technology tracks the audio signal, comparing it to the real PWM waveform and then corrects it over 400,000 times per second; thus distortion-causing mechanisms can be tightly controlled to enable pristine amplification.

Compact/Efficient Design: The amplifier features an overall efficiency of 80% at ½ rated power, which leads to reductions in chassis size and current draw.

RealSink Heat Management With Rollback Protection: This amplifier employs RealSink heat management, with vertical cast alloy heat sink fins. The design of the heat sinks was refined through extensive finite-element analysis, resulting in amplifiers that stay cool under demanding conditions. If the amplifier ever reaches an unsafe temperature, the Advanced Rollback Protection circuit adjusts the power output until the amplifier cools down, without ever shutting your music down.

Differential-Balanced Inputs: The differential-balanced input architecture effectively controls noise and ensures 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 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 installation.

Mounting: The MHD series amps have three mounting options to choose from:

• Standard: The standard method of mounting requires removal of the four corner caps with the included 4mm Allen-wrench. Using the appropriate mounting screws (not included), you can then secure the amplifier in all four corners and re-install the corner caps.
• Mounting Feet: The included feet can be mounted to the bottom corners of the amp using the included machine screws. Including the feet, the width of the amp is 11.7" and the height is 2.145".
• Stacking: Using 136HDSTKIT&nbsp;Stack Kits (sold separately), multiple MHD amplifiers can be stacked on top of one another.

Controls

Control Panel Cover: The MHD600/4-24V features a control panel cover to protect and hide the amplifier's controls. When installed, the cover ensures that the amplifier's settings are not accidentally changed. The cover is pre-installed at the factory and must be removed to access the amplifier's controls. It's secured by a single 2.5mm Allen-head screw.

Gain: Because the amplifier's R.I.P.S. feature delivers a predictable maximum unclipped output, correctly setting the gain levels is easily done. You'll need a digital AC Voltmeter (1203320, sold separately) and audio files with 50 Hz and 1 kHz sine-wave test-tones recorded at 0 dB reference.

Input Level: The range of the input sensitivity dials has two settings. Low is typically used for line-level sources (200mV-2V) and High for speaker-level (800mV-8V).

Input Mode: Set the 2-position input mode switch based on the number of inputs connected to your source unit:

• 2-Channel: only a single pair of inputs is used, connected to the front input terminals; the rear section of the amp is also fed by the front input
• 4-Channel: the front and rear inputs are used, maintaining fader control

Crossover Network: The front and rear sections of the amp have independent crossover controls, each with selectable options for High-Pass, Low-Pass, or Off:

• Frequency: A rotary dial lets you set the cutoff frequency of the filter; range 50-500 Hz
• Slope: The 2-position switch lets you set the crossover slope with options for 12dB/octave (Butterworth), or 24dB/octave (Linkwitz-Riley).

Connections

Power/Ground/Turn-On: The amplifier features a Power/Ground/Turn-On plug that detaches from the amplifier to make connecting your power, ground, and remote turn-on lead wires more convenient. Once your connections are made, the plug connector simply snaps into the port on the amplifier.

• Power and Ground: The set-screw Power and Ground terminals accept up to 4-gauge wire. (8-gauge minimum is recommended.) A 4mm Allen-wrench is supplied for making the connections.
• Remote Turn-On: The set-screw turn-on terminal will accept up to 12-gauge wire. A 2.5mm Allen-wrench is supplied for making the connection.

Speaker Output: The amplifier also features two Speaker Output plugs (front and rear) that detach from the amplifier for easier speaker wire connection. Once your speaker wires are connected, the plugs simply snap into the ports on the amplifier. The set-screw terminals will accept up to 12-gauge wire. A 2.5mm Allen-wrench is supplied for making the connections.

Preamp Inputs: The amplifier features two pairs of differential-balanced RCA jack inputs (front & rear), used for both preamp and speaker-level inputs (200mV-8V).

Preamp Outputs: A pair of RCA output jacks are provided as a pass-thru for the input signals when installing additional amplifiers. The preouts will pass input signals without filtering and unaffected by the input sensitivity settings. The outputs are buffered to prevent noise. A corresponding 2-way switch determines what input signals will be passed from the preamp outputs: Front or Front+Rear.

Remote Level Control: With the addition of the optional wired Remote Level Control (136HDRLC, sold separately), you can control the output level of either All Channels or the Rear Channels, selectable via a 2-way Remote Level Control switch on the control panel. If desired, multiple MHD amplifiers can be controlled from a single HD-RLC controller using a simple phone line splitter and multiple phone cables (all sold separately).