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MTX Road Thunder RT250D

Mono subwoofer amplifier — 250 watts RMS x 1 at 2 ohms

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  • MTX Road Thunder RT250D

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Our take on the MTX Road Thunder RT250D

by Buck Pomerantz
MTX

My system has plenty of power. Who needs an amp?

You might think you don't need an amp because you have a 400-watt system in your car, or because your new stereo puts out 50 watts a channel. But those are peak wattage ratings, which may boil down to 15 or 20 watts per channel, using the more realistic RMS rating. An amp sends your speakers the power they need to deliver your music with clarity and impact, whether you're using factory speakers or high-performance components. And low-frequency reproduction requires lots of power, so an amp is an absolute must if you're adding a sub to your system.

An MTX Road Thunder amp puts your music up front and in your face — in a great way. You won't stop smiling when you finally hear all the musical details and and feel the awesome bass that your old system just couldn't reproduce.

Power and features
MTX's RT250D mono sub amp will rock your ride with up to 250 watts RMS of clean bass power. You can use the variable frequency filters and bass boost to match this amp to your particular subwoofer system.

Reliable performance
When the beat gets hot during heavy play, this amp's inner works stay cool by shedding heat efficiently through a tough, extruded aluminum top cover and heatsink assembly. This Road Thunder amp features speaker-level inputs with special circuitry that turns the amp on when it senses an incoming signal, which come in handy if you're hooking it up to a factory radio.

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Highlights:

  • mono subwoofer amplifier
  • 125 watts RMS x 1 at 4 ohms (250 watts RMS x 1 at 2 ohms)
  • CEA-2006 compliant
  • frequency response: 20-200 Hz
  • adaptive Class D amp technology
  • variable low-pass filter (40-200 Hz, 12 dB/octave)
  • variable subsonic filter (20-50 Hz, 12 dB/octave)
  • variable bass boost (0-12 dB at 40 Hz)
  • External Bass Control included
  • preamp and speaker-level inputs
  • Smart Engage turns on amp when signal arrives through the speaker-level inputs
  • fuse rating: 30A x 2
  • 4-gauge power and ground leads recommended — wiring and hardware not included with amplifier
  • 10-1/16"W x 2-1/16"H x 8-3/4"D
  • warranty: 5 years (free repair or replacement for 2 years; prorated replacement for years 3 through 5)
  • 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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125 x 1
Peak Power Output (Watts x Channels)
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N/A
Power at 2 Ohms (Watts x Channels)
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250 x 1
Bridged Power (Watts x Channels)
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N/A
Minimum Impedance Bridged
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N/A
Minimum Impedance Unbridged
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2
Best Frequency Response
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20-200 Hz
THD at Rated RMS Power
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1%
Signal to Noise Ratio
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75 dB
Input Voltage
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14.4v
Features
Amplifier Class
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D
Low-Pass Crossover Frequency
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40-200 Hz
Low-Pass Slope (dB/octave)
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12 dB/oct
High-Pass Crossover Frequency
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N/A
High-Pass Slope (dB/octave)
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N/A
Bass Boost
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0-12 dB
Bass Boost Frequency
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40 Hz
Fan Cooled
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No
Fuse Rating
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30
Speaker Level Inputs
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RCA
Preamp Outputs
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No
Width (inches)
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10-1/16
Height (inches)
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2-1/16
Depth (inches)
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8-3/4
Parts Warranty
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5 Years (3-5 Prorated)
Labor Warranty
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5 Years (3-5 Prorated)
Product Research
What's in the box?

Download owner's manual

  • Mono-block amplifier
  • 30A ATO fuse (installed)
  • External Bass Control
  • 17' External Bass Control cable (RJ-25 plug on both ends)
  • Two 10' Speaker level input cables (each has an RCA connector on one end and tinned bare wire on the other)
  • 2.5mm Allen wrench
  • Instruction manual (English/ French/ Spanish/ German/ Italian/ Portuguese/ Dutch/ Russian/ Finnish/ Polish)

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
Warranty

Features

CEA-2006 Compliant: CEA-2006 is a 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 with 1% or less Total Harmonic Distortion plus noise (THD+N). Signal-to-Noise ratio is measured in weighted absolute decibels (dBA) at a reference of 1 watt. CEA-2006 allows consumers to compare car amplifiers and receivers on an equal basis. Measured under CEA-2006 conditions the MTX Road Thunder RT250D is rated at 250 watts RMS x 1 channel into a 2-ohm load and 150 watts RMS x 1 channel into a 4-ohm load, the signal to noise ratio is 75 dB.

Mono-Block Amplifier: The MTX Road Thunder RT250D 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.

Adaptive Class D Technology: While typical Class D amps tend to generate high frequency energy that must be filtered to prevent harmonic interference in the FM radio frequency range, Adaptive Class D Technology directs the amp's switching energy away from FM radio ranges as the amp's load and output increase. This improves the amp's overall signal-to-noise ratio and eliminates interference generated by more common Class D amps.

Protection Circuits: The RT250D provides Thermal and Short-circuit protection.

Controls

Gain: The rotary gain control is continuously variable from 250 mV to 5 V.

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

Sub-Sonic Filter: This amp features a 12dB/octave Sub-Sonic Filter, adjustable from 20 to 50 Hz. Ultra-low frequencies that cannot be reproduced by the subwoofer do not become sound but unnecessary oscillations, which affect sound by causing distortion. These frequencies also waste amplifier power and can cause damage to the speakers. Setting the Sub-Sonic Filter between 20 and 50 Hz removes the frequencies below the respective frequency to improve the performance of the speakers by eliminating harmful distortion.

Crossover: The RT250D features a 12 dB/octave crossover, continuously variable from 40 to 200 Hz to match the frequency response of your connected subwoofer(s). The crossover is always engaged (it cannot be bypassed).

Remote Bass Knob: A wired External Bass Control (EBC) is included with the MTX RT250D. The EBC connects to the amplifier using the supplied 17' RJ-25 cord, it's designed to mount under your vehicle's dash within arm's length so its easily accessible to the driver. The approximate dimensions are:

  • Width: 1-9/16" (2-5/8" including the mounting tabs)
  • Height: 3/4"
  • Depth: 1-1/2" (2" including the knob and wiring)

Connections

Power/Ground/Turn-On: The RT250D features set-screw terminals for Power, Ground and Remote turn-on. The Power and Ground terminals will accommodate up to 4 gauge wire (which MTX recommends), while the Remote turn-on lead will accept up to 10 gauge wire.

Line Level Input: MTX recommends using the RCA type inputs with a line-level signal when possible.

Speaker Level Input: The RT250D comes with two speaker level to RCA adapters, making it easier to add an amplifier to a factory radio or to an aftermarket receiver with no preamp outputs.

Speaker Connections: The amplifier is equipped with set-screw speaker terminals; they will accommodate up to 8 gauge wire.

EBC: The RJ-25 port (phone type connection) is for the included wired remote.

Fuse: The amplifier is equipped with one ATO type 30 amp fuse.

Warranty

5 Year Warranty Terms: This product carries a 5-Year Prorated Warranty with the following terms:

  • Years 1-2: Products found to be defective in materials or workmanship during the first two years will be, at Mitek's option, repaired or replaced by Mitek at no charge. The warranty period does not renew, but continues on from the original date of purchase.
  • Years 3-5: The purchase price of an item which becomes defective after the first two years and prior to the end of the warranty period will be prorated and credited toward the purchase of a new MTX product. The amount of proration is determined by dividing the original purchase price by the number of months in the warranty period (60), then multiplying the result by the number of months remaining in the warranty period.
 
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MTX Road Thunder RT250D Reviews

Average Customer Review:

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Filter by rating:
5 out of 5

Nice sound

Written By Anonymous, Rockport Tx on Thursday, February 21, 2013
Crutchfield Customer Review (What's this?)
 
This is paired to the JL audio 6 1/2 micro sub in my wifes 2011 Ford Fiesta hatchback. It sounds great and was easy to install and tune. I mounted under the front passanger seat, and faced allthe controlls towards the back seat. The amp stays cool even under the seat with less air flow around it. Also I like the remote gain control it makes it easy for quick adjustments.
Pros:
powerfull runs cool looks good remote gain control is nice
Cons:
none so far
Was this review helpful?    Yes | No
 
5 out of 5

MTX Road Thunder RT250D

Written By Anonymous, st.martinville on Tuesday, January 31, 2012
 
i had this amp to a kicker cvx 15 n it bottomed it out with no problem...this amp is a GORILLA!!!!!!!!
2 out of 2 people found this helpful
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5 out of 5

MTX Road Thunder RT250D

Written By Senior84, Toledo, OH on Sunday, May 29, 2011
 
I have this amp pushing two MTX subs in a Lincoln Town Car and they hit! The wattage may seem low, but trust me you will not be disappointed. I was thinking about moving up to 500 rms, but there is no need.
3 out of 3 people found this helpful
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5 out of 5

250 watts on 2 12" WORKS!

Written By Jason, Little Rock on Thursday, May 19, 2011
 
I had a 600 watt MTX Thunder X amp that I sold to my friend a few months back that was pushing 2 MTX Jackhammer 12" that I got from a local shop. i was planning on getting the 600 watt Jackhammer amp but I could not find one and when I saw this amp I liked the look as it is the same color as my car. The dealer told me that is amp would push my subs and it does HARD. I can hardly tell eh difference. When I tell people is a 250 watt amp they are like wow that hits. I should have got it here and saved the tax and the $40.00.
3 out of 3 people found this helpful
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