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Delivers clear, punchy power in a very small footprint—great for driving mids/highs or bridged channels; pay attention to wiring and fuse needs during installation.
Buyer confidence
88%Highlights
- Differential inputs with high level auto turn-on feature
- Remote-Out feature when using high level inputs
- 4 Ohm bridged capable
- Dual fan cooled
Key specs
Full specs- Number of Channels
- 4
- Total Power (Sum of Rated Power)
- 400 Watts
- Rated Power (RMS Continuous Power)
- 100 Watts x 4 @ 4-Ohm 100 Watts x 4 @ 2-Ohm 200 Watts x 2 @ 4-Ohm Bridged
- Dynamic Power (PVC/PowerCube®)
- 128 Watts x 4 @ 4-Ohm 152 Watts x 4 @ 2-Ohm 290 Watts x 2 @ 4-Ohm Bridged
- Bridgeable
- Yes Front Terminals: Left (+) Right (-) Rear Terminals: Left (+) Right (-)
- Frequency Response
- 20Hz-20kHz +/-1dB
- Input Sensitivity
- 150 mV to 12 V
- Circuit Topology Class
- Class AD
Key specs
Full specs- Number of Channels
- 4
- Total Power (Sum of Rated Power)
- 400 Watts
- Rated Power (RMS Continuous Power)
- 100 Watts x 4 @ 4-Ohm 100 Watts x 4 @ 2-Ohm 200 Watts x 2 @ 4-Ohm Bridged
- Dynamic Power (PVC/PowerCube®)
- 128 Watts x 4 @ 4-Ohm 152 Watts x 4 @ 2-Ohm 290 Watts x 2 @ 4-Ohm Bridged
Highlights
Overview- Differential inputs with high level auto turn-on feature
- Remote-Out feature when using high level inputs
- 4 Ohm bridged capable
Review highlights
Based on customer reviewsCompact, clean 4‑channel power that’s easy to hide and tune
Delivers clear, punchy power in a very small footprint—great for driving mids/highs or bridged channels; pay attention to wiring and fuse needs during installation.
What buyers praise
- Very compact — ideal for stealth or under‑seat mounting
- Clean, powerful output that suits mids/highs and bridged use
What to watch for
- Small chassis limits wiring: accepts up to 8 AWG, can be difficult to seat power cable, and won’t accept ferrules
Overview
The Power T400X4ad is an ultra-compact 400 Watt Class-AD 4-channel amplifier engineered for high efficiency and compact installs. It uses Constant Power to deliver the same output at 4‑ohm and 2‑ohm impedances, includes C.L.E.A.N. input/output clip detection, top-mounted controls with a built-in crossover, and a 3-stage thermal lock extrusion with dual fan forced-induction cooling.
Best for
- Hybrid and electric vehicles
- Small cars and trucks
- Motorcycles
- Side-by-side UTVs
- Space-limited or compact installations
Key points
- 400 Watt Class-AD 4-channel ultra-compact amplifier
- Multi-impedance Constant Power maintains output at 4Ω and 2Ω
- C.L.E.A.N. input/output clip detection and built-in crossover
- Low-level and high-level inputs with auto turn-on for flexible integration
- 3-stage thermal lock extrusion with dual fan forced-induction cooling
- CTA-2006 compliant; engineered in the USA
Fit and use
Designed for flexible vehicle integration, the amp accepts both low- and high-level inputs and offers auto turn-on. Top-mounted controls provide easy access to crossover and clip-detection settings. Its ultra-compact footprint is suited to installations where space is limited.
What to know
Check compatibility with your speakers and vehicle electrical system before purchase. The amplifier includes real-time thermal/protection schemes and forced-induction cooling to manage heat. Specifications such as exact channel power at given impedances and physical dimensions should be confirmed from the product docu…
Highlights
Key features
- Differential inputs with high level auto turn-on feature
- Remote-Out feature when using high level inputs
- 4 Ohm bridged capable
- Dual fan cooled
- Real time thermal sensing
- Dual extruded heat sinks
- 2/4 channel input switch
- 4/2 Ohm muti-impedance Constant Power
- Discrete surface mount technology
- 8 AWG power/ground connector w/ upgraded RCA connectors
- C.L.E.A.N. input/output clip detection and indicator LEDs
- Top mounted controls
More info
Manufacturer details
The Power T400X4ad is an ultra-compact, high efficiency 400 Watt 4-channel amplifier. Features multi-impedance Constant Power, input/output clip detection, top mounted controls and dual fan forced induction cooling. Perfect for hybrid, electric, small cars, trucks, motorcycles, and side-by-side UTVs.
Additional details
The Power T400X4ad 400 Watt 4-channel ultra-compact, amplifier is built on Rockford Fosgate’s proprietary Class-AD technology, featuring Constant Power to produce the same output at both 4-Ohm and 2-Ohm impedances. Flexible vehicle integration enabled through low-level and high-level inputs with auto turn-on. Top mounted controls allow easy access to built-in crossover and C.L.E.A.N. input/output clip detection circuits. The 3-stage thermal lock extrusion with dual fan forced induction keeps everything cool while real-time thermal/protection schemes safeguard the amplifier.
Technologies
3-Stage Airflow
3-stage airflow method effectively exhausts heat and ensures your amplifier runs cooler for optimum performance.
Patent: 7,994,857
Constant Power
Music and speakers have a dynamic relationship. As the frequency of music varies, so does the impedance of the
CTA-2006 Compliant
Power ratings on Rockford Fosgate amplifiers conform to CTA-2006 industry standards. These guidelines mean your
Class-AD
Rockford Fosgate's AD topology brings out high efficiency bd amplifier design to a full range application.
Patent: 8,712,066
C.L.E.A.N. Technology
Time and sophisticated test equipment have been replaced, with Rockford’s integrated level setting technology
CE Compliant
This product fulfills all essential safety and environmental requirements as defined in the European Directives
DSM
DSM - An industry-leading manufacturing process, DSM utilizes high-speed robotics, high-quality 1% tight-tolerance
Engineered In The USA
[av• uh•tahr -noun] 1. an embodiment or personification, as of a principle, attitude, or view of life 2. a
Differential Inputs
Differential input circuitry measures the voltage of both the (+) and (-) input signal. The circuitry subtracts
Specs
Specifications
29
| Number of Channels | 4 |
| Total Power (Sum of Rated Power) | 400 Watts |
| Rated Power (RMS Continuous Power) | 100 Watts x 4 @ 4-Ohm 100 Watts x 4 @ 2-Ohm 200 Watts x 2 @ 4-Ohm Bridged |
| Dynamic Power (PVC/PowerCube®) | 128 Watts x 4 @ 4-Ohm 152 Watts x 4 @ 2-Ohm 290 Watts x 2 @ 4-Ohm Bridged |
| Bridgeable | Yes Front Terminals: Left (+) Right (-) Rear Terminals: Left (+) Right (-) |
| Frequency Response | 20Hz-20kHz +/-1dB |
| Input Sensitivity | 150 mV to 12 V |
| Circuit Topology Class | Class AD |
| Efficiency (average) | >75% |
| Total Harmonic Distortion (THD+Noise) | 4-Ohm: <1.0% 2-Ohm: <1.0% |
| Signal Input | Front High/Low Level Input: 4-Pin harness Rear High/Low Level Input: 4-Pin harness |
| Signal Output | — |
| Tone Controls | Treble: 0 to +14 dB @ 12.5 kHz Bass: 0 to +18 dB @ 45 Hz |
| Crossover Controls | High-Pass: 50Hz - 250Hz @ 12dB/Octave Butterworth Low-Pass: 50Hz - 250Hz @ 12dB/Octave Butterworth All-Pass: Yes |
| Remote Controls | — |
| Visual Indicators | Power: Blue LED Protect: Red LED Input Clip: Red LED3 Output Clip: Blue/Violet/Red LED1,2,3 LED Color Legend: 1BLUE: <0.5% THD 2VIOLET: 1% THD 3RED: 10%+ THD |
| Power Wire Gauge | 8 AWG |
| Power Input Connector | Detachable Compression Terminal Replacement 1040-57997 |
| Speaker Wire Gauge | 16 AWG |
| Speaker Output Connector | Front: 4-Pin Harness Rear: 4-Pin Harness |
| Cooling | Dual Fan Cooled |
| Heatsink | Extruded Aluminum |
| Operating Voltage | 9 - 16 VDC |
| Recommended Fuse (not included) | 60 A |
| Average Current Draw (13.8V Music) | 28 A |
| Max. Current Draw (13.8V Sinewave) | 55 A |
| Suggested Alternator | 75 A |
| Dimensions (H x W x D) | 1.6 x 4.3 x 8.3 (in.) 4.1 x 10.8 x 21.1 (cm) |
| Shipping Weight | 3.4 Lbs. (1.54 Kg.) |
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Installation resources
Wiring diagrams
10
Wiring Diagram #1
Source: Rockford Fosgate
Wiring Diagram #2
Source: Rockford Fosgate
Wiring Diagram #3
Source: Rockford Fosgate
Wiring Diagram #4
Source: Rockford Fosgate
Wiring Diagram #5
Source: Rockford Fosgate
Wiring Diagram #6
Source: Rockford Fosgate
Wiring Diagram #7
Source: Rockford Fosgate
Wiring Diagram #8
Source: Rockford Fosgate
Wiring Diagram #9
Source: Rockford Fosgate
Support
Return Authorization
If you bought this product from Onkar Electronics, use the Contact Us page on the Onkar Electronics website and we will help with return authorization and warranty support. If you purchased it from another dealer, contact that authorized dealer first for return assistance.
Popular Questions
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