T400X4ad

The Rockford Fosgate T400X4ad from the Power Series is an exceptionally compact and powerful 4-channel amplifier featuring innovative Class AD technology. Despite its small size, the amplifier delivers a total output of 400 watts RMS and is ideal for high-end car audio systems with limited installation space.

Thanks to Constant Power technology, the amplifier delivers the same RMS power at both 4 ohms and 2 ohms. The built-in C.L.E.A.N. technology allows for precise adjustment of the input signal and monitors distortion at both the input and output. High-level inputs with an automatic power-on function make it easy to integrate the amplifier into existing factory sound systems.

The adjustable high-pass and low-pass filters, as well as the built-in Punch EQ tone control, allow for customization to match the connected speakers. Two temperature-controlled fans, a sophisticated aluminum cooling system, and electronic protection circuits ensure reliable operation even under heavy load.

Technical Specifications

General Characteristics

• Amplifier Type: 4-Channel Car Hi-Fi Amplifier

• Series: Rockford Fosgate Power

• Model: T400X4ad

• Amplifier Technology: Class AD

• Number of channels: 4

• Total power: 400 watts RMS

• Constant Power technology for identical power output at 2 and 4 ohms

• Bridge connection possible

• CEA-2006-compliant performance specifications
  
  

RMS output power at 14.4 V

• 4 ohms: 4 × 100 watts RMS

• 2 ohms: 4 × 100 watts RMS

• 4 ohms bridged: 2 × 200 watts RMS
  
  

Dynamic Output Power

• 4 ohms: 4 × 128 watts

• 2 ohms: 4 × 152 watts

• 4 ohms bridged: 2 × 290 watts
  
  

Audio and Signal Parameters

• Frequency response: 20 Hz – 20,000 Hz (±1 dB)

• Total Harmonic Distortion plus Noise (THD+N) at 4 ohms: less than 1.0%

• Total Harmonic Distortion plus Noise (THD+N) at 2 ohms: less than 1.0%

• Signal-to-noise ratio according to CEA-2006: over 90 dB

• Signal-to-noise ratio at rated power: over 110 dB

• Channel separation: over 60 dB

• Common-mode rejection: over 60 dB

• Input impedance: 20 kOhm

• Input sensitivity: 150 mV – 12 V

• Efficiency: over 75%
  
  

Crossover Networks and Sound Settings

• High-pass filter (HPF): 50–250 Hz, continuously adjustable

• Low-pass filter (LPF): 50–250 Hz, continuously adjustable

• Filter slope: 12 dB/octave

• Filter characteristic: Butterworth

• Full-range operation is possible without a frequency filter

• Punch Bass EQ: 0 to +18 dB at 45 Hz

• Punch Treble EQ: 0 to +14 dB at 12.5 kHz

• Switchable 2-/4-channel signal input

• C.L.E.A.N. System for Detecting Signal Clipping

• Separately accessible controls on the top of the housing
  
  

Connections and Features

• Low-level inputs for RCA signals

• High-level inputs for connecting to factory-installed radios

• Automatic activation via a high-level signal

• Remote-Out Function When Using the High-Level Inputs

• Removable power connection terminal

• Power and ground connections: 8 AWG (approx. 8.4 mm²)

• Speaker Connections via Plugs

• Recommended speaker cable gauge: 16 AWG (approx. 1.3 mm²)

• Optional Punch Level Controller (PLC2) can be connected

• Operating indicator via blue LED

• Protection indicator via red LED

• LED indicators for input and output clipping
  
  

Power Supply and Cooling

• Operating voltage: 9–16 V DC

• Recommended external fuse: 60 A

• Maximum current draw at 13.8 V (sine wave): 55 A

• Average current consumption at 13.8 V (music signal): 28 A

• Aluminum heat sink with multi-stage heat dissipation

• Active cooling via two built-in fans

• Real-Time Temperature Monitoring

• Electronic protection circuits against thermal overload and malfunctions
  
  

Dimensions

• Width: 108 mm

• Height: 41 mm

• Length: 211 mm
  
  

What's Included

• 1 × Rockford Fosgate T400X4ad 4-Channel Amplifier

• Connectors and cables for power supply, speakers, and signal inputs

• Installation hardware

• User and Installation Manual

• Individual Performance Test Certificate