2-Channel Rack-Mount Power Amplifier (400W at 8 Ohm Stereo)

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The Samson SX1800 is a professional rack-mount power amplifier designed for live sound or installation audio applications, offering an output power of 400W per channel at 8 ohms. The amplifier can operate in stereo, parallel, or bridged-mono mode according to your needs and offers combination XLR/TRS input jacks and 5-way binding posts and Speakon output connectors. Front-panel volume knobs let you make level adjustments easily.

The SX1800 has a solid offering of internal protection, including circuitry to protect against overheating, short circuits, and DC. The unit is fan-cooled for increased reliability. The Samson SX1800 has an open, natural sound quality with a wide frequency range and very low distortion. All of these features inside a 2U steel housing make the SX1800 a great option for your amplification needs.


  • 2U rack space stereo power amplifier
  • Rugged all-steel chassis
  • Three-mode stereo/parallel/bridged-mono operation with dedicated rear-panel switch
  • Forced-air, vari-speed dual temperature-sensitive fans cooling for reliable, consistent performance
  • Toroidal low-profile, high current transformer power supply
  • Protection relay circuitry with dedicated LEDs includes thermal overload protection, On/Off muting, and clip protection
  • Unique bipolar circuit design minimizes or nulls DC output at idling stage, which conserves energy and prevents speaker damage
  • XLR/TRS combo input connectors, 5-way binding post and Speakon outputs


Power Rating: 400W @ 8? Stereo (per channel), 600W @ 4? Stereo (per channel),1200W @ 8? Bridged-Mono

Damping Factor: 280 (400Hz)

Input Sensitivity: 1.24V (4 dBu)

Input Impedance: 15 k ohms Unbalanced, 30 k ohms Balanced

Gain: 33dB
Frequency Response: 20Hz - 20kHz (0/-0.5dB @ 8 ohms, 1W), 5Hz - 60kHz (0/-3dB @ 8 ohms, 1W)

Signal-to-Noise Ratio: 102dB (20Hz - 20kHz)

Total Harmonic Distortion (THD): 0.01% or Less

Input Connections: 2 x XLR/1/4" Combo Jacks

Output Connectors: 2 x 5-way Binding Posts, 2 x Speakon Connectors

Controls Front Panel: 2 x Volume Control Knobs, 1 x Power Switch

Controls (Rear): 1 x 3-Way Bridge/Stereo/Parallel Switch, 1 x 15 Amp Circuit Breaker Switch

Indicators: 1 x Blue Power On LED,1 x Amber Protection LED, 2 x Green Signal LEDs, 2 x Red Peak LEDs

Cooling: Dual Vairable-Speed Fans

Power Consumption: 7.2A @ 1/8 Power, 4 ohms, 12A @ 1/3 Power, 4 ohms, 19.5A @ Rated Power, 4 ohms (Max)

Power Requirements: 100/115/220/230/240 VAC, 50/60 Hz

Dimensions: 19 x 3.5 x 16" (483 x 89 x 408mm)

Weight: 37 lbs (16.5 kg)

Specialties: Protection Circuitry, Removable Front Panel Fan Filters for Simplified Cleaning, Stereo/Parallel/Bridged Operating Modes

Samson SX1800 Powered Amplifier
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