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MTX JackHammer JH1200

Mono subwoofer amplifier — 800 watts RMS x 1 at 2 ohms

Item # 236JH1200

The JackHammer Series by MTX offers just what its name implies — aggressive styling with plenty of...

Find what Fits your vehicle

The JackHammer Series by MTX offers just what its name implies — aggressive styling with plenty of...

Discontinued item

Item # 236JH1200

60-day returns

If you don't love it, send it back.

60-day price protection

We’ll reimburse you if the price drops.

Since 1974

Years of experience making people happy.

About the MTX JackHammer JH1200

The JackHammer Series by MTX offers just what its name implies — aggressive styling with plenty of hard-hitting power, so your system will look great and sound even better. The chrome detailing and powder-coated steel chassis with vented bumper guards provide exceptional durability, while the MTX logo lets people know you're packing serious power.

The JackHammer Series by MTX offers just what its name implies — aggressive styling with plenty of hard-hitting power, so your system will look great and sound even better. The chrome detailing and powder-coated steel chassis with vented bumper guards provide exceptional durability, while the MTX logo lets people know you're packing serious power.

The JH1200 mono subwoofer amplifier delivers 400 watts RMS at 4 ohms. This workhorse can handle a 1-ohm load with ease, so it'll send up to 1,200 watts RMS to your multi-sub setup. Patented MTX technologies process and amplify your signal without wasting energy and creating harmful levels of heat.

Active Fan Cooling system speeds up the internal fan as you turn your volume up, so more cool air reaches the inner workings as power demands increase. Variable filters help you match the signal output to your speakers, and a bass boost lets you control the "boom" in your sound.

Confused about impedance? Check out our article on matching subs and amps.

READ LESS

Product highlights:

  • mono subwoofer amplifier
  • 400 watts RMS x 1 at 4 ohms (800 watts RMS x 1 at 2 ohms)
  • 1,200 watts RMS x 1 at 1 ohm
  • frequency response: 20-200 Hz
  • variable low-pass filter (40-200 Hz, 24 dB/octave)
  • variable subsonic filter (20-50 Hz, 12 dB/octave)
  • bass boost (12 dB at 40 Hz)
  • Active Fan Cooling with automatic variable fan speed
  • Smart Engage turns on amp when signal arrives through the speaker-level inputs
  • CEA-2006 compliant
  • preamp and speaker-level inputs
  • 4-gauge power and ground leads and a 100-amp fuse recommended — wiring and hardware not included with amplifier
  • no onboard fuses — when installing multiple amps in a system, an additional 100-amp in-line fuse between the distribution block and the amplifier is recommended
  • 17-1/4"W x 2-3/8"H x 9-1/4"D
  • warranty: 1 year
  • Our 60-day money-back guarantee
  • MFR # JH1200

What's in the box:

  • Mono-block amplifier
  • Bass knob
  • 16.5' Bass knob cable with RJ-11 connectors on each end
  • Two 24" Speaker level to RCA adapters (each have on RCA connector on one end and bare tinned wire on other end)
  • 2 Plastic jack stands
  • 2 Screws
  • Hex-key
  • MTX Warranty Statement/Wiring diagram
  • Amplifier Performance Certificate

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Features
Controls
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Features

CEA-2006 Compliant: CEA-2006 is a new system of testing and measurement methods for mobile audio amplifiers. This voluntary standard advocates a uniform method for determining an amplifier's RMS power output and signal-to-noise ratio. The criteria for measuring power uses a DC input voltage of 14.4 volts and the RMS power output is measured into a 4-ohm load, with 1% or less Total Harmonic Distortion (THD) plus noise, and at a frequency range of 20 Hz to 20,000 Hz when applicable. Signal-to-Noise ratio is measured in weighted absolute decibels (dBA) at a reference of 1 watt into 4 ohms. CEA-2006 allows consumers to compare car amplifiers and receivers on an equal basis. The MTX Jack Hammer JH1200 under CEA-2006 regulations is rated at 400 Watts RMS x 1 channel with a 62dBA signal to noise ratio.

1-Ohm Stable: The MTX mono-amplifier is capable of handling load impedances down to 1-ohms. The amplifier is rated at 800 Watts RMS x 1 channel in 2 ohms with 1% THD and 1200 Watts RMS x 1 channel in 1 ohms with 1% THD.

Mono-Block Amplifier: The MTX Terminator JH1200 is designed with specific features to power your subwoofer or subwoofers with a frequency range between 20 to 200 Hz. This amplifier is not designed to power a full-range speaker.

Class-D Design: The JH1200 is a Class D mono-block amplifier, which uses digital switching to amplify audio signals. This design results in high efficiency and less heat.

Active Fan Cooling: Rather than weighing the amplifier down with heavy aluminum heat sinks, the Jack Hammer amplifier is cooled using a variable speed internal fan. The increasing output of the amplifier engages the fan to automatically increase its speed allowing more cool air to enter the amplifier. This keeps the amplifier performing at its peak level longer and prevents the amplifier from going into thermal shutdown due to overheating. The fan will automatically slow down when the amplifier's output is decreased.

Protection Circuits: The JH1200 provides Thermal and Overload protection with LED indicators.

Stackable: You can stack up to three Jack Hammer amplifier on top of one another using the supplied "JackStands".

Controls

Crossover: The JH1200 features a variable 40Hz to 200Hz, 24db/Oct crossover to match the frequency response of your connected subwoofer(s).

Bass Boost: The amplifier's bass boost is adjustable from 0-12dB at 40Hz.

Sub-Sonic Filter: This amp features an adjustable 20 to 50Hz, 12dB/octave Sub-Sonic Filter. 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. Setting the Sub-Sonic Filter between 20Hz to 50Hz cuts the frequencies below the respective frequency to improve the reproduction performance of the speakers by eliminating harmful distortion.

Remote Bass Knob: The MTX JH1200 comes supplied with a wired remote bass knob which allows you to adjust the bass output of the amplifier. The bass knob is designed to be mounted underneath your vehicle's dash within arm's length so its easily accessible to the driver. The bass knob connects to the amplifier using the supplied 16.5' RJ-11 cord. The wired remote bass knob measures 2.655" wide x 0.755" tall x 1.955" deep.

Connections

Power/Ground/Turn-On Connections: The JH1200 features set-screw terminals for the Power, Ground and Remote turn-on lead. The Power and Ground terminals will accommodate up to a 1/0 AWG wire, while the Remote turn-on lead will accept up to a 16 AWG wire.

RCA Inputs: The pair of RCA type line-level inputs have gain (Input Sensitivity) control. The Input Sensitivity control will accept an input signal of 250mV to 5.0 Volts.

Smart-Engage Speaker Level Input: The Jack Hammer JH1200 comes with a set of speaker level input harnesses. This feature makes it easier to add an amplifier to a factory radio or to a receiver with no preamp outputs. When using the speaker-level inputs, the amp automatically turns on when it senses signal from the head unit, eliminating the need for a remote turn-on connection. In many cases, this feature will allow you to install the amplifier without removing your radio.

Parallel Speaker Connections: The amplifier is equipped with two pairs of speaker terminals for an easy parallel subwoofer connection. The set-screw speaker terminals will accommodate 12 to 8 AWG speaker wire.

EBC: RJ-11 connection for connecting the supplied wired remote bass knob.

Fuse: The amplifier is not equipped with an onboard fuse. A 125-amp in-line fuse is recommended when installing this amplifier.

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