MTX TH350.1D

TH Series mono sub amplifier — 350 watts RMS X 1 at 1 ohm

  • MTX TH350.1D


  • MTX TH350.1D

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Our take on the MTX TH350.1D

by Buck Pomerantz

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.

MTX muscle from a TH Series amp

If you're addicted to great bass, then you know that MTX has been building great amps and subs for decades. Their TH350.1D mono amp mixes the latest advancements in amp technology with MTX know-how to bring you strong, clean power that you can rely on — day in and day out. This TH Series amp delivers up to 350 watts to your subwoofer system, with some cool features that'll make your life easier.

Flexibility and reliability

The TH350.1D can handle multiple subs, operating safely with loads as low as 1 ohm. What's this mean to you? You can send 125 watts RMS to a single 4-ohm sub right now, but you won't have to sell your amp when you add more subs later on. This 1-ohm stability gives you a little more flexibility as your system changes over time. And, speaking of time, MTX designs their amps for reliability. All internal wiring is as short as possible, for the purest reproduction with low noise. And you'll find a handy clip light that helps you set your gain properly, so you know you're getting the cleanest bass possible.

TH350.1D mono amp

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Tuning your bass

MTX includes a number of tools for tuning your bass. The low-pass filter sets up a 24 dB per octave wall that stops higher frequencies from reaching your sub. You can also adjust the subsonic filter to remove the extreme low frequencies, which helps your sub play louder and improves the performance of many enclosures. And this amp also features an old school bass boost, which allows you to kick in up to 12 dB of bump at 40 Hz for max bass when you need it. MTX includes a wired remote, so you can adjust the bass level from your front seat.


  • mono subwoofer amplifier
  • 125 watts RMS x 1 at 4 ohms (250 watts RMS x 1 at 2 ohms)
  • 350 watts RMS x 1 at 1 ohm
  • CEA-2006 compliant
  • frequency response: 20-200 Hz
  • adaptive Class D amp technology
  • variable low-pass filter (40-200 Hz, 24 dB/octave)
  • variable subsonic filter (20-50 Hz, 12 dB/octave)
  • variable bass boost (0-12 dB at 40 Hz)
  • External Bass Control included
  • clip light helps set gain
  • preamp and speaker-level inputs
  • Smart Engage turns on amp when signal arrives through the speaker-level inputs
  • fuse rating: 30A
  • 4-gauge power and ground leads recommended — wiring and hardware not included with amplifier
  • 10-1/8"W x 2-1/16"H x 7-5/8"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
RMS Power Output (Watts x Channels) 125 x 1
Peak Power Output (Watts x Channels) 750 x 1
Power at 2 Ohms (Watts x Channels) 250 x 1
Bridged Power (Watts x Channels) ---
Minimum Impedance Bridged N/A
Minimum Impedance Unbridged 1
Best Frequency Response 20-200 Hz
THD at Rated RMS Power 1%
Signal to Noise Ratio 75 dB
Input Voltage 14.4v
Amplifier Class D
Low-Pass Crossover Frequency 40-200 Hz
Low-Pass Slope (dB/octave) 24 dB/oct
High-Pass Crossover Frequency N/A
High-Pass Slope (dB/octave) N/A
Bass Boost 0-12 dB
Bass Boost Frequency 40 Hz
Fan Cooled No
Fuse Rating 40
Speaker Level Inputs RCA
Preamp Outputs No
Width (inches) 10-1/8
Height (inches) 2-1/16
Depth (inches) 7-5/8
Parts Warranty 5 Years (3-5 Prorated)
Labor Warranty 5 Years (3-5 Prorated)
Product Research
What's in the box?

Download owner's manual

  • Mono amplifier with one 40A ATO fuse installed
  • Two 10' speaker-level input wires (with RCA plug on one end and bare wire on the other)
  • Electronic Bass Control (EBC) module
  • 16' EBC cable (with RJ-25 plugs on each end)
  • Owner's Manual (En/ Fr/ Sp/ Po)

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.



Overview: The MTX TH350.1D is a mono block Class D amplifier. It has anodized aluminum heatsinks to dissipate heat generated by the amplifier. The amp produces 125 watts RMS x 1 at 4 ohms, and 250 watts RMS x 1 at 2 ohms.

1 Ohm Stable: The TH350.1D is stable down to 1 ohms. At 1 ohms, the power output is 350 watts x 1.

Protection Circuits: The TH350.1D provides protection against overheating and electrical short circuits.

Gain: The amp's rotary gain control is continuously variable from 250mV to 5V to match the output of the source unit.

Crossovers: The amp features a built-in low-pass crossover, with a continuously variable cutoff frequency of 40-200Hz. It has a slope of 24dB/oct. In addition, the amp has a subsonic filter, which cuts ultra-low frequencies to minimize wasted power and protects speakers not capable of reproducing those frequencies. It has a variable crossover frequency of 20-50Hz, and a slope of 12dB/oct. Both filters are non-defeatable.

Bass Boost: The TH350.1D's bass boost circuit is variable from 0 to +12dB, and centered at 40 Hz.

Electronic Bass Control (EBC): The amplifier comes with the Electronic Bass Control (EBC) module that allows you to adjust the gain of the amplifier from the front of the vehicle. The EBC comes with a 16' cable which plugs into the RJ-25 jack on the amplifier.

Smart Engage: When the speaker-level inputs are used, the amplifier will automatically power on when voltage is detected on the input. No separate Remote Turn-on lead is required. This is especially convenient when adding an amplifier to a factory system without RCA outputs, or when adding an amp and sub in the trunk and you don't want to remove the head unit.


Line Level Input/Output: The line-level signals from the source unit are input using the stereo RCA inputs. The amp does not offer a line-level output.

Speaker-level Inputs: If the source unit lacks RCA outputs, such as a factory head unit, you can splice the two supplied speaker-level input wires into the head unit's speaker wires, and then plug them into the stereo RCA inputs.

Power Terminals: The TH350.1D features set screw terminals for power, ground and remote turn-on. The power and ground terminals will accommodate up to 4 AWG wire, while the remote turn-on terminal will accept up to 10 AWG wire. The set screws can be loosened or tightened with the supplied Allen wrenches. MTX recommends the use of 4 AWG power and ground wires with the TH350.1D.

Speaker Connections: The amplifier is equipped with set screw terminals for the speaker outputs. The terminals will accommodate up to 8 AWG wires, and can be loosened or tightened with the supplied Allen wrench.

EBC Port: The amp has a RJ-25 modular phone jack for plugging in the supplied Electronic Bass Control (EBC) module. The EBC comes with a 16' cable, allowing you to control the gain of the amp from the front of the vehicle.


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 TH350.1D Reviews

Average Customer Review:

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5 out of 5

Great product

Written By Rossb6, Warren,PA on Tuesday, January 28, 2014
Crutchfield Customer Review (What's this?)
I us a Rockford Fosgate PS2 and this amp powers it well. it came with a wired remote gain adjuster that you can run from your amp to drivers seat and is very easy and useful.
The gain adjuster that it comes with is absolutely awesome and very useful! made of metal and is very high build quality. It looks very cool and high tech but is quite simple and easy to use. lots of setting so you can make your sub sound just how you want it to.
none that I have found.
Was this review helpful?    Yes | No
5 out of 5


Written By Yeappers, Lake city fl on Thursday, August 01, 2013
Crutchfield Customer Review (What's this?)
Great little amp drives 12" kicker free air sub better than cadillac factory sub amp
Came with remote gain control
Did not come with power and groud wire so had to make a trip to wally world
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5 out of 5

great item

Written By ngeiman2002, houston tx on Sunday, June 09, 2013
Crutchfield Customer Review (What's this?)
this is a great amp for something small like an 8 or a 10'' sub crutchfield knows there stuff trust in them mtx has never failed me i bought this amp to replace a 15 year old mtx that had seen better days great sound deep bass.
easy to set up wiring was nice also the input areas where constructed good even the screw down points had a lot of metal to grip on
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4 out of 5

MTX TH350.1D

Written By quster, st.louis mo. on Friday, March 08, 2013
Crutchfield Customer Review (What's this?)
This amp does it!! I have it running a 1.4 ohm Bose sub in my 95 Yukon and the sound is really good and I ordered another of These little power amps for my other Bose sub. This amp also Keeps cool so covering this amp won't cause a problem.
Stays cool , small
Wish it had precise lp filter scale on the adjustment.
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"Coolness Factor"
Build Quality
Ease of Use
Sound Quality

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