Rockford Fosgate T1000-4AD Power 1,000 Watt Class-ad Full-Range 4-Channel Amplifier

1,000W Class-AD 4-Channel Full-Range Amplifier Class-A Sound Quality, Class-D Efficiency, Constant Power, 2-Year Warranty.

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Product Overview

The Rockford Fosgate Power T1000-4AD is a 1,000W 4-channel full-range amplifier built on Rockford Fosgate's Class-AD technology an amplifier topology combining the sound quality characteristics of a Class-A design with the power efficiency of Class-D. Where Class-BD was developed for brute subwoofer power, Class-AD is Rockford Fosgate's answer for high-fidelity, full-range speaker amplification designed for front stage component systems, full-range 4-way installations, and any application where audio quality across the full frequency spectrum is the priority.

Sound quality is enhanced through dynamic switching frequency control a technique that optimises the amplifier's internal switching frequency dynamically for improved linearity and reduced audible artefacts. Constant Power circuitry produces optimised output across a range of impedances. Combined with MOSFET power supply and output stages, 24dB/octave crossover, RCA pass-thru, and a confirmed 2-year warranty, the T1000-4AD is Rockford Fosgate's premium full-range 4-channel Power series amplifier.

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Key Specifications

• Power output: 1,000W total (4-channel — per-channel rated power at specific impedance not confirmed — see Red-flags)
• Amplifier class: Class-AD (Class-A sound quality + Class-D efficiency)
• Configuration: 4-channel, full-range
• Constant Power: Yes — optimised output across a range of impedances
• Dynamic switching frequency control: Yes
• Crossover: 24dB/octave
• 2/4 channel input switch: Yes
• RCA pass-thru outputs: Yes
• MOSFET power supply: Yes
• MOSFET output stage: Yes
• Power/ground connectors: 4 gauge
• Speaker connections: Audiophile grade
• Signal-to-noise ratio: Not specified — confirm with Rockford Fosgate
• THD: Not specified — confirm with Rockford Fosgate
• Frequency response: Not specified — confirm with Rockford Fosgate
• Dimensions: Not specified — confirm with Rockford Fosgate
• Weight: Not specified — confirm with Rockford Fosgate
• Warranty: 2 years ✓

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Features & Benefits

• Class-AD — Class-A Sound Quality with Class-D Efficiency — Class-A amplifiers are widely regarded for their linearity and low distortion but are thermally inefficient and physically large. Class-D amplifiers are highly efficient but have historically made compromises in audio quality. Rockford Fosgate's Class-AD combines the sonic characteristics of Class-A operation with the power efficiency of Class-D — delivering high-fidelity full-range amplification in a format suited to demanding car audio installations.
• Dynamic Switching Frequency Control — A proprietary technique that dynamically adjusts the amplifier's internal switching frequency to optimise linearity and minimise switching-related artefacts — contributing to the Class-AD's high-fidelity performance across the full audio frequency range. This is the technical mechanism that distinguishes Class-AD's audio quality from standard Class-D designs.
• Constant Power — Optimised Output Across Impedances — The Constant Power circuitry maintains optimised output across a range of speaker impedance loads — providing consistent performance whether 4Ω or 2Ω speakers are connected, without the significant power variation seen in standard amplifier designs at different load impedances.
• 1,000W 4-Channel Full-Range Configuration — 250W per channel (total rated — confirm per-channel at specific impedance from the official datasheet) across four full-range channels. Designed for high-output front and rear speaker systems where component speakers or full-range coaxials require substantial clean power to achieve their performance potential.
• RCA Pass-Thru Outputs — Signal pass-through allows the headunit RCA signal to be looped to a downstream amplifier — enabling the T1000-4AD to drive four speaker channels while simultaneously feeding a dedicated subwoofer amplifier for a complete multi-amplifier system.
• 24dB/Octave Crossover — Steep crossover slope for precise frequency band management — enabling high-pass filtering on front and rear speakers and the option to configure rear channels for subwoofer use in mixed speaker/subwoofer builds.
• 2/4 Channel Input Switch — Accepts either a 2-channel stereo input (internally distributed to all four outputs) or discrete 4-channel front and rear RCA inputs — accommodating both 2-channel and 4-channel headunit preamp configurations.
• MOSFET Power Supply and Output Stage — MOSFET implementation across both supply and output stages supports the high-current, low-noise delivery required for Class-AD's high-fidelity operation.
• 4 Gauge Power and Ground Connectors — Appropriate power delivery infrastructure for a 1,000W 4-channel amplifier.
• Audiophile Grade Speaker Connections — High-quality output terminals across all four channels for low-resistance, high-integrity speaker connections.
• 2-Year Warranty — Confirmed manufacturer warranty — two years of coverage on Rockford Fosgate's flagship full-range 4-channel Power series amplifier.

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Technical Specs

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Compatible With / Goes Well With

Designed for:

• High-fidelity full-range front and rear speaker systems
• Front stage component speaker systems requiring high-power, low-distortion amplification
• Multi-amplifier builds: T1000-4AD for speaker channels + dedicated mono sub amp via RCA pass-thru
• Demanding audiophile-oriented car audio builds where audio quality is the primary concern

Pairs well with:

• Rockford Fosgate Power series mono subwoofer amplifiers (T1000-1BDCP, T1500-1BDCP, T2500-1BDCP) via RCA pass-thru
• Rockford Fosgate Power series component front stage speakers
• 4-gauge amplifier wiring kits
• Rockford Fosgate or aftermarket 4-channel RCA cables

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Frequently Asked Questions

What does Class-AD mean and why does it matter for full-range speakers?

Class-AD combines the sound quality characteristics of Class-A amplification with the power efficiency of Class-D. Class-A designs are highly linear and produce very low distortion but are thermally inefficient. Class-D is efficient but involves switching-based operation that can introduce artefacts. Rockford Fosgate's Class-AD and its dynamic switching frequency control aim to deliver high-fidelity full-range performance with efficient power delivery — a meaningful advantage for component speaker systems that operate across the full 20Hz–20kHz range.

What is dynamic switching frequency control?

Dynamic switching frequency control is a technique where the amplifier dynamically adjusts its internal switching frequency based on the signal being amplified. This optimises linearity at each operating point, reducing the audible by-products of switching-mode amplification — contributing to the Class-AD's high-fidelity performance compared to standard fixed-frequency Class-D designs.

What is the confirmed per-channel power output of the T1000-4AD?

The total rated power is 1,000W across four channels. Per-channel power at 2Ω and 4Ω is not confirmed in the supplier data — pull the official Rockford Fosgate T1000-4AD datasheet for the full power specification table, including per-channel RMS at each impedance.

How does the T1000-4AD differ from the T600-4?

The T1000-4AD delivers 1,000W total (vs the T600-4's 600W), uses Rockford Fosgate's Class-AD technology with dynamic switching frequency control, and is specifically designed for high-fidelity full-range use. Both include RCA pass-thru. The T600-4 uses a conventional MOSFET design. For audiophile-oriented builds where audio quality is the priority, the T1000-4AD is the appropriate choice.

Is the T1000-4AD suitable for running subwoofers on the rear channels?

Yes. The 24dB/octave crossover allows the rear channels to be configured in low-pass mode for subwoofer use. However, the T1000-4AD's primary design intent is high-fidelity full-range speaker amplification via Class-AD technology — for dedicated subwoofer channels, a Class-BD mono amplifier (T1000-1BDCP, T1500-1BDCP, T2500-1BDCP) connected via the RCA pass-thru is the more appropriate and more powerful solution.