About the JL Audio MHD900/5
Providing plenty of clean power is key to getting great sound on a boat. JL Audio's 5-channel MHD900/5 marine amplifier will push out four channels of 100 watts RMS to two sets of marine speakers, along with 500 watts RMS to your sub, from a 2" tall chassis with a footprint the size of a sheet of computer paper. This amp is a great choice to power a "four satellites and a sub" system where space is limited.
JL Audio high tech
The amp's sub channel uses Regulated, Intelligent Power Supply (R.I.P.S.) technology to ensure and maintain full output power with any subwoofer load from 1.5 to 4 ohms. The main channels have been regulated to produce optimum output power at 4 ohms. JL Audio uses their patented Single Cycle Control™ technology to eliminate distortion in the output stages. Differential-balanced inputs filter out noise before it hits the preamp stages, and allow you to connect the amp to just about any stereo.
A gasketed panel protects the controls, and stainless-steel connection hardware prevents corrosion. Removable power and speaker plugs make it easy to pop this amp out if you need the space, or want to put the amp in storage.
You can use JL Audio's optional stack kit to mount one MHD Series amp on top of another, for a very cool-looking installation that'll produce maximum power from minimum space. An optional wired remote allows you to control your subwoofer's volume from the helm.
MHD900/5 control panel
- 5-channel marine amplifier
- 100 watts RMS x 4 at 4 ohms + 500 watts RMS x 1 at 1.5 to 4 ohms
- 75 watts RMS x 4 at 1.5 to 3 ohms + 500 watts RMS x 1 at 1.5 to 4 ohms
- 150 watts RMS x 2 bridged at 3 to 6 ohms + 500 watts RMS x 1
- 200 watts RMS x 2 bridged at 8 ohms + 500 watts RMS x 1
- Class D amp design with Single Cycle Control and R.I.P.S. (Regulated, Intelligent Power Supply)
- frequency response: 12-28,000 Hz (main channels); 12-10,000 Hz (sub channel)
- variable high-pass filter on front and rear channels (50-500 Hz, 12 or 24 dB/octave)
- variable low-pass filter on subwoofer channel (50-500 Hz, 12 or 24dB/octave)
- switchable subsonic filter on subwoofer channel (30 Hz, 24 dB/octave)
- optional wired remote for sub level control
- removable power and speaker plugs
- optional HD stacking kit for stacking multiple MHD amps together
- differential-balanced inputs help eliminate noise
- preamp and speaker-level inputs (speaker wire to RCA adapter required for speaker-level input)
- wiring, fuse, and hardware not included with amplifier
- 4-gauge power and ground leads and a 60-amp fuse recommended
- dimensions: 10-3/4"W x 2"H x 9-1/2"D
- warranty: 2 years
- MFR # 98226
What's in the box:
- 5-Channel class-D amplifier
- Power/Ground/Turn-On plug
- Two 2-speaker connection plugs
- One 1-speaker connection plug
- 4 Mounting feet
- 2.5mm Allen-wrench
- 4mm Allen-wrench
- four M4x40mm Flat head machine screws
- JL Audio badge
- Owner's manual
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More details on the JL Audio MHD900/5
Features & specs
|RMS Power Output (Watts x Channels)||100 x 4|
|Frequency Response at Rated RMS Power||---|
|THD at Rated RMS Power||0.03%|
|Signal to Noise Ratio||108 dB|
|Peak Power Output (Watts x Channels)||N/A|
|Power at 2 Ohms (Watts x Channels)||75 x 4|
|Bridged Power (Watts x Channels)||150 x 2|
|Minimum Impedance Bridged||3|
|Minimum Impedance Unbridged||1.5|
|Low-Pass Crossover Frequency||50-500 Hz (sub ch)|
|Low-Pass Slope (dB/octave)||12 or 24 dB/octave|
|High-Pass Crossover Frequency||50-500 Hz (F/R ch)|
|High-Pass Slope (dB/octave)||12 or 24 dB/octave|
|Bass Boost Frequency||N/A|
|Speaker Level Inputs||Yes|
|Parts Warranty||2 Years|
|Labor Warranty||2 Years|
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 (11-14.5 volts). The result is power stability in real-world 12-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.
- Power Output:
- 4Ω: 100 watts RMS x 4 (11-14.5 volts)
- 1.5Ω-3Ω: 75 watts RMS x 4 (11-14.5 volts)
- Bridged (8Ω): 200 watts RMS x 2 (11-14.5 volts)
- Bridged (3Ω-6Ω): 150 watts RMS x 2 (11-14.5 volts)
- Sub: 500 watts RMS x 1 (3Ω-6Ω and 11-14.5 volts)
- THD at rated power:
- Front/Rear: <0.03% @ 4Ω
- Sub: <0.05% @ 4Ω
- Signal to Noise Ratio:
- At Rated Power: 108 dBA
- At 1 Watt: 88 dBA
- Frequency Response:
- Front/Rear: 12 Hz - 28 kHz (+0/-1 dB)
- Sub: 12 Hz - 10 kHz (+0/-1 dB)
- Damping Factor:
- 4Ω: >400 @ 50 Hz
- 2Ω: >200 @ 50 Hz
- 4Ω: >800 @ 50 Hz
- 2Ω: >400 @ 50 Hz
Class D with Single-Cycle Control: The MHD900/5 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.
Note: You will need speaker wire to RCA adaptors (136XDCLR2S, sold separately) to connect this amplifier to your headunit's speaker-level outputs.
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 with of the amp is 11.7" and the height is 2.145".
- Stacking: Using 136HDSTKIT Stack Kits (sold separately), multiple MHD amplifiers can be stacked on top of one another.
Control Panel Cover: The MHD900/5 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 3-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 and sub sections of the amp are also fed by the front input
- 4-Channel: the front and rear inputs are used, maintaining fader control; the sub section of the amp is fed by summing the two inputs
- 6-Channel: the front, rear, and sub terminals are connected to discrete signals from your source unit
Crossover Network: The front, rear, and sub sections of the amp have independent crossover controls:
- Front/Rear: The front and rear crossovers
are High-Pass only.
- Slope: The three position slope switch is set to Off (bypasses crossover for full range output), 12dB/octave (Butterworth), or 24dB/octave (Linkwitz-Riley).
- Frequency: The crossover point is variable from 50-500 Hz (actually 53-508 Hz).
- Subwoofer: The subwoofer crossover is Low-Pass only.
- Slope: The three position slope switch is set to Off (bypasses crossover), 12dB/octave (Butterworth), or 24dB/octave (Linkwitz-Riley).
- Frequency: The crossover point is variable from 50-500 Hz (actually 53-508 Hz).
- Infrasonic Filter: The Infrasonic Filter is a 24 dB/octave high-pass filter, with a fixed cutoff frequency of 30 Hz. This filter is designed to conserve amplifier power and protect subwoofer systems, without audibly degrading the sub-bass output. The Infrasonic filter can be turned off if you prefer.
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. (4-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.
Note: The Amplifier is not equipped with a fuse. An external 60-amp fuse (not included) must be installed on the power wire. If a wiring kit is used which includes a fuse with a value other than 60-amps, the original should be replaced with a 60-amp fuse.
Speaker Output: The amplifier also features three Speaker Output plugs (front, rear, and sub) 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 three pair of differential-balanced RCA jack inputs (front, rear, and sub), used for both preamp and speaker-level inputs (200mV-8V).
Remote Level Control: With the addition of the optional wired Remote Level Control (136HDRLC, sold separately), you can control the output level of the subwoofer channel. 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).
Note: All inputs and outputs are located on the rear side of the amplifier to make installation of the amplifier simple and neat.
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