SKU: 504X
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MTX 504X 300W RMS 4-Channel Class A/B Amplifier

300W RMS 2 Ohm Stable 4-Channel Class A/B Full Range Amplifier

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The XThunder 504X is a 4-channel designed to power coaxial or component speakers in any vehicle application. This unit features a full range, class A/B design that allows it to deliver exceptional sound quality.

Key Features:

  • Anodized Aluminum Top Cover
  • Class A/B Topology
  • Set Screw Terminals
  • High and Low Pass Crossover
  • Line and Speaker Level Inputs
  • Durable ABS Endcaps

The XThunder 504X offers high end fit and finish that is designed to bring a great look and great sound to your installation. The unit features an anodized aluminum top cover that not only looks good but efficiently dissipates heat away from critical components ensuring the amplifier plays loud and long when you need it to. Each channel is capable of outputting 50-watts RMS power at 4Ω or 75watts RMS power at 2Ω. Additionally the rear channels can be bridged to drive a 4Ω subwoofer with 150-watts RMS power. 

504X EndcapThe class A/B topology has long been considered the standard for sound quality and the 504X delivers with crystal clear sound, even at high volumes. The unit includes both a high pass and low pass filter so that your speakers play only the frequencies they are supposed to without overworking. The unit can easily connect to factory or aftermarket radios using either the high level or speaker level inputs to get signal from the source to the amplifier.

The unit's terminal blocks use set screw type connectors to ensure maximum signal transfer of both power and output. A set screw connector eliminates the need for a spade or slide connector and offers the best security for maintaining wire integrity within the block. Overall the XThunder 704X delivers great sound and high power at an unbeatable price that offers great value and peace of mind.

Dimensions & Details


  • Description: 4 Channel
  • 2Ω RMS Power Output: 75W x 4 Channels
  • 4Ω RMS Power Output: 50W x 4 Channels
  • 1Ω RMS Power Output: NA
  • Bridged RMS Power: 150W x 2 Channels
  • Signal to Noise Ratio: >75 dB
  • Topology: Class A/B
  • THD: <1%
  • Frequency Response: 20Hz - 20kHz
  • Crossover: High, 12dB/Oct; 40Hz to 8000Hz Low, 24dB/Oct; 40Hz to 5000Hz
  • Max Sensitivity: 250mV
  • Maximum Input Signal: 4V
  • Height: 9.125"
  • Width: 9.75"
  • Depth: 2.25"

Returns & Warranty

30-Day Money-Back Guarantee

At MTX Audio, we are serious about sound®. Therefore, if you are not "blown away" with your purchase, for any reason, you can return any items purchased directly from that are complete and like new within 30 days. Products purchased from authorized MTX retailers must be returned through that same retailer. Products purchased through non-authorized MTX retailers may not be returned.

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Warranty Information

MTX products purchased in the USA from an authorized MTX dealer are guaranteed against defects in material and workmanship for the period of time specified below, the warranty period begins the day the product is purchased by the end user. This warranty is limited to the original retail purchaser of product and extends only to products purchased from authorized MTX resellers. Product found to be defective during that period will be repaired or replaced by MTX at no charge.

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