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MTX TH350.1D

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

5 Reviews

Item # 236TH3501D

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Our take on the MTX TH350.1D

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.

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

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.

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

Product Highlights:

  • 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

What's in the Box:

  • 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)

Excellent the best amp for my subwoofer

Anonymous, palm bay


MTX TH350.1D Reviews

Average Customer Review(s):

(5 Reviews)

MTX TH350.1D

Anonymous from palm bay on 12/24/2014

Crutchfield Customer Review (What's this?)

Excellent the best amp for my subwoofer

Pros: Everything

Cons: None

Great product

Rossb6 from Warren,PA on 1/28/2014

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.

Pros: 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.

Cons: none that I have found.


Yeappers from Lake city fl on 8/1/2013

Crutchfield Customer Review (What's this?)

Great little amp drives 12" kicker free air sub better than cadillac factory sub amp

Pros: Came with remote gain control

Cons: Did not come with power and groud wire so had to make a trip to wally world

great item

ngeiman2002 from houston tx on 6/9/2013

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.

Pros: 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

Cons: none

MTX TH350.1D

quster from st.louis mo. on 3/8/2013

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.

Pros: Stays cool , small

Cons: Wish it had precise lp filter scale on the adjustment.


Hands-on research

Product Research



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.

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 verify what’s in the box, 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.