Rockford Fosgate T1500-1bdCP Power 1,500 Watt Class-bd Constant Power Amplifier

1,500 Watts of Constant Power Rockford Fosgate's Class-BD Mono Subwoofer Amplifier for Serious Bass Builds.

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Product Overview

The Rockford Fosgate Power T1500-1BDCP is a 1,500W mono amplifier built exclusively for subwoofer applications in cars and trucks. Based on the legendary T1500-1bd platform, it adds Rockford Fosgate's proprietary Constant Power configuration delivering up to 25% more power across all impedance loads than the standard design, so your subwoofer receives closer to the full 1,500W regardless of whether it presents a 1Ω, 2Ω, or 4Ω load.

The Class-BD topology, MOSFET power supply, and MOSFET output stage combine to deliver the current headroom and switching efficiency needed for sustained high-output bass performance. A 24dB/octave crossover tightly defines the subwoofer frequency band, the infrasonic filter protects against potentially damaging sub-audible frequencies, and RCA pass-thru outputs keep the signal chain intact for multi-amplifier systems. Stepping up from the T1000-1BDCP, the T1500-1BDCP delivers an additional 500W of headroom for larger subwoofer builds, high-efficiency ported enclosures, and high-output SPL-oriented systems.

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Key Specifications

• Power output: 1,500W (mono — rated power at specific impedance not confirmed — see Red-flags)
• Amplifier class: Class-BD
• Configuration: Monoblock (subwoofer dedicated)
• Constant Power technology: Yes — up to 25% more power across all impedance loads (supplier-stated)
• Crossover: 24dB/octave
• Infrasonic filter: Yes
• Power supply: MOSFET
• Output stage: MOSFET
• Speaker connections: Audiophile grade
• Power/ground connectors: 4 gauge
• RCA pass-thru outputs: Yes
• Frequency response: Subwoofer optimised for cars and trucks (specific Hz range not confirmed)
• Signal-to-noise ratio: Not specified — confirm with Rockford Fosgate
• THD: Not specified — confirm with Rockford Fosgate
• Input voltage range: Not specified — confirm with Rockford Fosgate
• Dimensions: Not specified — confirm with Rockford Fosgate
• Weight: Not specified — confirm with Rockford Fosgate
• Warranty: Not specified — confirm with Rockford Fosgate

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Features & Benefits

• Constant Power Technology — Up to 25% More Power Across All Impedance Loads — Rockford Fosgate's Constant Power configuration delivers maximum output more consistently across the full impedance range. Whether your subwoofer is wired to 1Ω, 2Ω, or 4Ω, you get closer to the full 1,500W rather than the steep power reduction seen at higher impedances in a standard amplifier design. (Supplier-stated performance claim.)
• 1,500W — 500W More Than the T1000-1BDCP — The step up from the T1000-1BDCP delivers an additional 500W of headroom — suited to larger subwoofer drivers, high-efficiency ported enclosures, dual subwoofer builds, and any system requiring sustained output levels beyond what a kilowatt amplifier comfortably provides.
• Class-BD Topology — Rockford Fosgate's proprietary Class-BD combines the audio performance characteristics of Class-B/AB with the efficiency of Class-D, engineered specifically for subwoofer applications requiring high current delivery to low-impedance loads.
• MOSFET Power Supply and Output Stage — Dual MOSFET implementation — in both the power supply and output stage — provides the fast switching speed, high current headroom, and thermal stability needed for sustained 1,500W operation in demanding subwoofer applications.
• 24dB/Octave Crossover — The steep 24dB/octave crossover slope sharply limits frequency content above the subwoofer band, preventing midrange content from reaching the sub driver and ensuring clean integration with the main speaker amplifier in a multi-amplifier system.
• Infrasonic Filter — Removes inaudible sub-20Hz content that causes excessive cone excursion in ported and bandpass subwoofer enclosures. At 1,500W, protecting the subwoofer driver from over-excursion at extreme output levels is particularly important.
• RCA Pass-Thru Outputs — Signal pass-through allows the T1500-1BDCP to be connected in series in the signal chain — passing the headunit RCA signal through to a second amplifier — rather than requiring a Y-split at the headunit.
• 4 Gauge Power and Ground Connectors — 4-gauge wiring input accommodates the substantial current draw of a 1,500W mono amplifier, ensuring the wiring termination does not limit current delivery at peak output.
• Audiophile Grade Speaker Connections — High-quality output terminals provide a low-resistance, secure connection to the subwoofer voice coil — maximising power transfer at high current levels.

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Technical Specs

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Compatible With / Goes Well With

Suitable subwoofer configurations:

• Single or dual subwoofer setups requiring a high-output dedicated mono amplifier
• 1Ω, 2Ω, and 4Ω impedance loads (confirm specific power ratings per impedance with Rockford Fosgate)
• High-efficiency ported, sealed, and bandpass subwoofer enclosures
• High-output and SPL-oriented car audio builds

Pairs well with:

• Rockford Fosgate Power series subwoofers (T1, T2, T3 series)
• OEX or Rockford Fosgate 4-gauge amplifier wiring kits
• Rockford Fosgate or aftermarket RCA signal cables
• A full-range 4 or 5-channel amplifier connected via RCA pass-thru for a complete car audio system

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Frequently Asked Questions

What does "Constant Power" mean on the T1500-1BDCP?

Constant Power is Rockford Fosgate's proprietary technology that maintains rated power output more consistently across different impedance loads. Where a standard amplifier delivers full power at one impedance and significantly less at others, the T1500-1BDCP's Constant Power configuration delivers up to 25% more across the full impedance range. Specific power ratings at each impedance should be confirmed with Rockford Fosgate.

What is the difference between the T1000-1BDCP and the T1500-1BDCP?

Both amplifiers share the same Class-BD Constant Power platform and feature set. The T1500-1BDCP delivers 1,500W versus the T1000-1BDCP's 1,000W — providing an additional 500W of headroom for larger subwoofers, dual-sub builds, high-efficiency ported enclosures, and high-output SPL-focused systems.

What subwoofer impedance is the T1500-1BDCP best matched to?

Specific rated power per impedance (1Ω, 2Ω, 4Ω) is not confirmed in the supplier data. Confirm the RMS power at your intended subwoofer wiring impedance directly with Rockford Fosgate or your authorised reseller before purchasing, to ensure correct amplifier-to-subwoofer matching.

What does the infrasonic filter do at 1,500W?

At 1,500W, the infrasonic filter is particularly important — sub-20Hz content that causes excessive cone excursion at moderate power levels can become damaging at high output levels in ported and bandpass enclosures. Enabling the infrasonic filter protects the subwoofer driver while making no audible difference to bass performance.

Can the T1500-1BDCP be used with the RCA pass-thru to run a separate speaker amplifier?

Yes. The RCA pass-thru outputs loop the headunit signal to a downstream amplifier — allowing the T1500-1BDCP to handle the subwoofer channel while a separate 4 or 5-channel amplifier handles the full-range speaker channels, without requiring a Y-split at the headunit.