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This tiny 400W Class‑AD 2‑channel amp delivers surprisingly powerful, clean sound and fits in tight spaces like motorcycle fairings. Reviewers praise its clarity, cooling, and built‑in clip indicators, and report it handles 6.5" component speakers as well as bridged subs with ease. Some installs may need extra steps (head‑unit flashing or power upgrades).
Buyer confidence
84%Highlights
- Differential inputs with high level auto turn-on feature
- Remote-Out feature when using high level inputs
- 4 Ohm bridged capable
- 2013 PLC2 remote ready
Key specs
Full specs- Number of Channels
- 2
- Total Power (Sum of Rated Power)
- 400 Watts
- Rated Power (RMS Continuous Power)
- 200 Watts x 2 @ 4-Ohm 200 Watts x 2 @ 2-Ohm 400 Watts x 1 @ 4-Ohm Bridged
- Dynamic Power (PVC/PowerCube®)
- 223 Watts x 2 @ 4-Ohm 248 Watts x 2 @ 2-Ohm 449 Watts x 1 @ 4-Ohm Bridged
- Bridgeable
- Yes Terminals: Left (+) Right (-)
- Frequency Response
- 20Hz - 20kHz +/-1dB
- Input Sensitivity
- 150 mV - 12 V
- Circuit Topology Class
- Class AD
Key specs
Full specs- Number of Channels
- 2
- Total Power (Sum of Rated Power)
- 400 Watts
- Rated Power (RMS Continuous Power)
- 200 Watts x 2 @ 4-Ohm 200 Watts x 2 @ 2-Ohm 400 Watts x 1 @ 4-Ohm Bridged
- Dynamic Power (PVC/PowerCube®)
- 223 Watts x 2 @ 4-Ohm 248 Watts x 2 @ 2-Ohm 449 Watts x 1 @ 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 reviewsRockford Fosgate Power T400X2ad — compact, punchy 2‑channel amplifier
This tiny 400W Class‑AD 2‑channel amp delivers surprisingly powerful, clean sound and fits in tight spaces like motorcycle fairings. Reviewers praise its clarity, cooling, and built‑in clip indicators, and report it handles 6.5" component speakers as well as bridged subs with ease. Some installs may need extra steps (head‑unit flashing or power upgrades).
What buyers praise
- Very compact — fits in motorcycle fairings and other tight spaces
- High power for size — drives 6.5" components and can be bridged for subs
What to watch for
- Crossover top end (250 Hz) may be lower than some users want for certain tuning needs
Overview
The Rockford Fosgate Power T400X2ad is an ultra-compact, high-efficiency 400 Watt 2-channel amplifier built on Class-AD technology. It delivers Constant Power (same output at 4‑Ω and 2‑Ω), includes C.L.E.A.N. input/output clip detection, top-mounted controls with a built-in crossover, and a 3-stage thermal extrusion with dual fan forced-induction cooling and real-time protection.
Best for
- Installations with limited space (compact cars, small trucks)
- Hybrid and electric vehicles where efficiency and cooling are important
- Motorcycles, side-by-side UTVs, and other small vehicle audio systems
Key points
- 400 Watt stereo (2-channel) ultra-compact amplifier
- Class-AD topology for high efficiency
- Constant Power maintains output at both 4‑Ω and 2‑Ω impedances
- C.L.E.A.N. input/output clip detection
- Top-mounted controls with built-in crossover
- Low-level and high-level inputs with auto turn-on for integration flexibility
Fit and use
The amplifier’s ultra-compact footprint makes it suitable for vehicles with limited installation space. Flexible input options (low- and high-level) and auto turn-on support a variety of system integrations. Top-mounted controls provide easier access once installed.
What to know
Constant Power means the amp produces the same rated output at 4‑Ω and 2‑Ω loads. The unit uses a 3-stage thermal design and dual fans to manage heat; it also includes real-time protection features. Compliance notes: CTA-2006 and CE listed in product specifications.
Highlights
Key features
- Differential inputs with high level auto turn-on feature
- Remote-Out feature when using high level inputs
- 4 Ohm bridged capable
- 2013 PLC2 remote ready
- Dual fan cooled
- Real time thermal sensing
- 2-Year Warranty
- Rockford Fosgate proprietary Class AD technology
- 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
More info
Manufacturer details
The Power T400X2ad is an ultra-compact, high efficiency 400 Watt stereo 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 T400X2ad 400 Watt 2-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
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
Engineered In The USA
[av• uh•tahr -noun] 1. an embodiment or personification, as of a principle, attitude, or view of life 2. a
DSM
DSM - An industry-leading manufacturing process, DSM utilizes high-speed robotics, high-quality 1% tight-tolerance
CE Compliant
This product fulfills all essential safety and environmental requirements as defined in the European Directives
CTA-2006 Compliant
Power ratings on Rockford Fosgate amplifiers conform to CTA-2006 industry standards. These guidelines mean your
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
Class-AD
Rockford Fosgate's AD topology brings out high efficiency bd amplifier design to a full range application.
3-Stage Airflow
3-stage airflow method effectively exhausts heat and ensures your amplifier runs cooler for optimum performance.
Differential Inputs
Differential input circuitry measures the voltage of both the (+) and (-) input signal. The circuitry subtracts
Specs
Specifications
28
| Number of Channels | 2 |
| Total Power (Sum of Rated Power) | 400 Watts |
| Rated Power (RMS Continuous Power) | 200 Watts x 2 @ 4-Ohm 200 Watts x 2 @ 2-Ohm 400 Watts x 1 @ 4-Ohm Bridged |
| Dynamic Power (PVC/PowerCube®) | 223 Watts x 2 @ 4-Ohm 248 Watts x 2 @ 2-Ohm 449 Watts x 1 @ 4-Ohm Bridged |
| Bridgeable | Yes Terminals: Left (+) Right (-) |
| Frequency Response | 20Hz - 20kHz +/-1dB |
| Input Sensitivity | 150 mV - 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 | 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 | Optional PLC2 provides Punch Level Control |
| 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 | 4-Pin Harness |
| Cooling | Dual Fan Cooled |
| Operating Voltage | 9 - 16 VDC |
| Recommended Fuse (not included) | 60 A |
| Average Current Draw (13.8V Music) | 23 A |
| Max. Current Draw (13.8V Sinewave) | 45 A |
| Suggested Alternator | 75 A |
| Dimensions (H x W x D) | 1.6 x 4.3 x 7 (in.) 4.1 x 10.8 x 17.8 (cm) |
| Shipping Weight | 2.9 Lbs. (1.31 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.
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