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Crutchfield

JL Audio M700/5

5-channel marine amplifier

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  • JL Audio M700/5

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  • JL Audio M700/5

  • JL Audio M700/5

  • JL Audio M700/5

  • JL Audio M700/5

  • JL Audio M700/5

  • JL Audio M700/5

  • JL Audio M700/5

  • JL Audio M700/5

  • JL Audio M700/5

 

Our take on the JL Audio M700/5

by Ken Nail
JL Audio

Small footprint, big kick

JL Audio's M700/5 5-channel marine amp is small — less than 11" wide — but it delivers a massive amount of power from its compact chassis — up to 100 watts from each of its front and rear channels, plus up to 300 watts from the subwoofer channel. It owes these impressive specs to JL Audio's Class D NexD™ ultra-high-speed switching design, which eliminates the traditional drawbacks of a Class D amp design to deliver full-bandwidth performance, excellent efficiency, and very low distortion levels.

 M700/5 5-channel marine amp

Great for a variety of applications

JL Audio designed this 5-channel amp to drive a complete marine audio system, running two sets of high-performance coaxial or component speakers, and powering up a sub at the same time with fifth channel. The special powder-coat finishes, the gasketed control cover, and the stainless-steel hardware all protect this amp against the harsh realities of the marine environment.

JL Audio M700/5

The built-in variable frequency filters offer high- or low-pass modes depending on the channels, so you can tailor the output to meet your system's needs. JL Audio's optional wired remote lets you adjust the amp's level from the helm, while the preamp outputs make it easier to get signal to another amplifier in your system.

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Highlights:

  • 5-channel marine amplifier
  • 75 watts RMS x 4 at 4 ohms + 180 watts RMS at 4 ohms
  • 100 watts RMS x 4 at 2 ohms + 300 watts RMS x 1 at 2 ohms
  • 200 watts RMS x 2 bridged at 4 ohms + 300 watts RMS x 1 at 2 ohms
  • Class-D design
  • white and gray powder-coat finishes, gasketed control cover, and stainless steel hardware
  • variable high-pass filter on front channels (50-5000 Hz, 12 dB per octave)
  • variable high- or bandpass filters on rear channel (50-500 Hz, 12 dB per octave)
  • low-pass filter on subwoofer channel (50-500 Hz, 12 or 24 dB per octave)
  • optional remote level control
  • preamp-level inputs
  • preamp outputs
  • 4-gauge power and ground leads recommended — wiring and hardware not included with amplifier
  • 10-1/4"W x 2-1/16"H x 7-1/8"D
  • warranty: 2 years
  • Our 60-day money-back guarantee

Hands-on research from the Crutchfield Labs (what are the Labs?)

Features and Specs
Performance
RMS Power Output (Watts x Channels)
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75 x 4
Frequency Response at Rated RMS Power
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20-20k Hz
THD at Rated RMS Power
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1%
Signal to Noise Ratio
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104 dB
Input Voltage
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14.4v
Peak Power Output (Watts x Channels)
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N/A
Power at 2 Ohms (Watts x Channels)
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100 x 4
Bridged Power (Watts x Channels)
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200 x 2
Minimum Impedance Bridged
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4
Minimum Impedance Unbridged
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2
Features
Amplifier Class
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D
Low-Pass Crossover Frequency
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50-500 Hz
Low-Pass Slope (dB/octave)
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12 or 24 dB/oct
High-Pass Crossover Frequency
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50-5,000 Hz
High-Pass Slope (dB/octave)
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12 dB/oct
Bass Boost
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No
Bass Boost Frequency
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N/A
Fan Cooled
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No
Fuse Rating
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60
Speaker Level Inputs
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Yes
Preamp Outputs
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No
Height (inches)
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2
Width (inches)
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10-5/16
Depth (inches)
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7-1/8
Parts Warranty
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2 Years
Labor Warranty
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2 Years
Product Research
What's in the box?

Download owner's manual

  • 5-Channel Class-D marine amplifier
  • 2.5mm Allen wrench
  • JL Audio emblem
  • Owner's Manual

Our Product Research Team

At Crutchfield, you'll get detailed, accurate information that's hard to find elsewhere. That's because we have our own in-house Product Research team — they open the box, verify contents, check the owner's manual, and record dimensions, features and specs. We stay on top of new products and technologies to help people make informed choices.

Features
Controls
Connections

Features

5-Channel Full-Range Amplifier: The JL Audio M700/5 is a five-channel, class-D marine amplifier utilizing NexD ultra-high speed switching technology to deliver outstanding fidelity and efficiency. The M700/5 can be operated with a wide variety of source units and system configuration.

Marine Amplifier: The JL Audio M-series marine amplifiers are specifically designed for marine applications. These amps are not waterproof, however, and should not be mounted where they are likely to get wet.

Amplifier Rating: The JL Audio M700/5 Class D marine amplifier is rated at 75 Watts RMS x 4-channels (front and rear) + 180 Watts x 1-channel (subwoofer) in 4-ohm at 20 to 20,000Hz with a signal-to-noise-ratio of 104 dB and a total harmonic distortion of 1% while receiving 14.4 Volts.

NexD Class D Technology: NexD is a state-of-the-art switching amplifier design that combines exceptional audio quality with excellent efficiency and less complexity. This results in an affordable compact amplification with exceptional audio quality and unsurpassed total efficiency.

Advanced Rollback Protection: The M-Series amplifiers employ advanced thermal and low-impedance protection to virtually eliminate annoying amplifier shut-down events. Should any M-Series amplifier ever overheat, its intelligent, unregulated power supply reacts by limiting available peak voltage until the amplifier returns to a safe temperature range. Likewise, if an impedance lower than optimal for the amplifier is present at the outputs, the M-series amplifier will roll back peak voltage to protect itself without shutting down.

Differential-Balanced 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 12-volt audio installation.

Note: You will need three speaker wire to RCA adaptors (136XDCLR2S, sold separately) to connect this amplifier to your headunit via speaker-level.

Protection Circuitry With Status Indicator Lights: There is a single multi-color LED on the top panel of the amplifier to indicate the amplifier's operating status.

  • Flashing Green: When the LED is flashing green, the amplifier is powering up and audio output is muted.
  • Constant Green: This LED lights green to indicate that the amplifier is turned on and operating normally.
  • Constant Red: This Red LED lights to indicate that the amplifier has exceeded its safe operating temperature, putting the amplifier into a self-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.
  • Constant Amber (Yellow): The Amber (Yellow) LED light indicates that an over-current condition has occurred and is accompanied by a muting of the amplifier's output. Over-current condition can be caused by a speaker impedance lower than the optimum load impedance range for the amplifier or a short-circuit in the speaker wiring.
  • LED Off: The only condition that will shut down an undamaged M700/5 completely is if battery voltage or remote turn-on voltage drops below 10 Volts. The amplifier will turn back on when voltage climbs back above 11 Volts.

Cooling System: The outer shell of the JL Audio amplifier is designed to remove heat from the amplifier circuitry. For optimum cooling performance, this outer shell should be exposed to as large a volume of air as possible.  Enclosing the amplifier in a small, poorly ventilated chamber can lead to excessive heat build-up and degraded performance.

Controls

Control Panel Cover: The M700/5 features a Control Panel Security Cover which protects and hides the amplifier's controls. When installed, the cover ensures that the amplifier's settings are not accidentally changed while creating a clean aesthetic look for the amplifier and your installation. The control panel security cover is pre-installed at the factory and must be temporarily removed for access the amplifier's controls. The security cover is secured by two 2.5mm Allen-head screws.

Simplified Gain Setting: The M Series amplifier makes setting the gain level of the amp 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).

Note: The M700/5 is equipped with a independent gain controls for Channels 1/2, 3/4, and 5.

Flexible Input Section And Active Crossover Network: The JL Audio M-series amplifier provides a flexible input section and a comprehensive crossover network to fine tune your system effectively and accurately. The variable filter design employed in the JL Audio M-series amplifier crossover sections allow you to seamlessly switch slopes, easily change filter frequencies and address what frequencies the preamp inputs will pass. The M700/5 offers the following independent crossover adjustments for the front, rear, and subwoofer channels along the unit's top panel, behind a removal cover plate.

  • Input Mode: This switch allows operation of all 5 amplifier channels with only one pair of input signals (2ch); with independent front and rear input signal pairs (4ch); or with discrete front, rear, and subwoofer signal pairs (6ch).
  • Filter Mode: The amplifier allows you to select either a Full-Range or High-Pass crossover setting for channels 1/2 (front). For channels 3/4 (rear), you can choose between a Full-Range, High-Pass, or Band-Pass crossover setting. Either a Full-Range, a 12dB/oct. Low-Pass, or a 24dB/oct. Low-Pass crossover setting can bet chosen for the subwoofer channel (5).
  • Variable Frequency: For channels 1/2 (front), you can set the high-pass crossover frequency between 50-500 Hz or 500-5000 Hz (by switching the HP Filter Mode from x1 to x10). For channels 3/4 (rear), you can set the band-pass or high-pass crossover frequency between 50-500Hz. For channel 5 (subwoofer), you can set the low-pass filter frequency between 50-500Hz.

Connections

Power/Ground/Turn-On Terminals: The amplifier features set-screw terminals for the power, ground, and remote turn-on connections:

  • Power and Ground: The JL Audio amplifier's set-screw Power and Ground connections are designed to accept 8 to 4 AWG power wire. A 2.5mm Allen wrench is supplied for making connections.
  • Remote Turn-On: The amplifier's set-screw turn-on lead will accept 18 to 8 AWG wire. The same 2.5mm Allen wrench is supplied for making connection.
Note: The Amplifier is not equipped with a fuse. An external 60-amp AFS, AGU, or MAXI 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 Terminals: The M700/5 amplifier's twelve set-screw speaker terminals will accept 16 to 8 AWG speaker wire. A 2.5mm Allen wrench is supplied for making connections.

Preamp Inputs: The amplifier features 3 pair of differential-balanced RCA jack inputs. The amplifier features a dedicated Input Sensitivity gain control for the front 1/2, 3/4, and 5 channels of the amplifier. These controls are designed to match the input sensitivity of the M700/5 to the specific signal source that is feeding it. The amplifier's input level can be set independently for all channels between 100mV-4V.

Remote Level Control: The amplifier features a standard telephone connector for adding an optional wired remote level control. With the addition of the optional wired Remote Level Control (136HDRLC, sold separately), you can control the volume of all channels or just the subwoofer channel of the M700/5 from the front of your vehicle. This is useful for subwoofer level control or even as a master volume control for your system. If desired, multiple M-series 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 one side of the amplifier to make installation of the amplifier simple and neat.
 
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JL Audio M700/5 Reviews

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Filter by rating:
5 out of 5

Powerful and Compact

Written By Chris E, Annapolis, MD on Monday, May 19, 2014
Crutchfield Customer Review (What's this?)
 
So much function and clean power in a small form factor makes this amp the best choice for marine applications. This amplifier replaced two that I was using to power a sub, 4 in-boat speakers and 4 tower speakers. Tons of power and clean sound. Fit and finish is excellent as expected with JL components. Couldn't be happier with my decision.
Pros:
Small, versatile, clean lines, great power with low distortion
Cons:
None
Was this review helpful?    Yes | No
 
5 out of 5

Do it right the first time!

Written By Jimmy jam, Gulf shores, alabama on Sunday, April 13, 2014
Crutchfield Customer Review (What's this?)
 
Replaced my 6 channel MB Quart with this amp. Should have bought this amp 2 years ago. I am powering four 61/2 infinitys, with 2 ten inch polk audio's. I was scared this small amp wouldn't have enough power for the subs. Boy was I wrong. Highs are only up half gain, and my subs gain is 2/3's up, and my boat screams now. Thanks jl audio!
Pros:
Small size, with lots of power!!
Cons:
None!
Was this review helpful?    Yes | No
 
5 out of 5

Great Amp

Written By Bailey, jacksonville, F on Saturday, March 16, 2013
Crutchfield Customer Review (What's this?)
 
This is a powerful amp running a pair of JL's and a Polk MM 10. Going to add anouther pair of the JL's later in the season. The installer that put my boat system told me all he uses is the JL amp 's because the are the best marine grade.
Pros:
small, easy to mount
2 out of 2 people found this helpful
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5 out of 5

Nice Little Amp

Written By jevanoff, Denver on Wednesday, September 05, 2012
Crutchfield Customer Review (What's this?)
 
Very nice, this amp has a very small footprint and I was amazed at the sound when I got it tuned in. I am running 4 polks, 2- 6.5" JL audio towers, and a 10" sub. With the gain control at 40% it ROCKS the boat. Couldn't be happier. Crutchfield you rock!!
Pros:
Small footprint Marine rated 5 channel Nice power rating
Cons:
None
4 out of 4 people found this helpful
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Add accessories for the JL Audio M700/5

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JL Audio XM-WHTSC16 Speaker Wire 16-gauge marine speaker wire — priced per foot
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