--- product_id: 20191156 title: "Rockford Fosgate Power T400X4ad 400 Watt 4-Channel Amplifier | Class-AD with Constant Power" brand: "rockford fosgate" price: "$855.23" currency: USD in_stock: true category: "Rockford Fosgate" url: https://www.desertcart.us/products/20191156-rockford-fosgate-power-t400x4ad-400-watt-4-channel-amplifier-class store_origin: US region: United States of America --- # 400W max power output Ultra-compact 1.6” x 4.3” x 8.3” size Constant Power across 2Ω & 4Ω loads Rockford Fosgate Power T400X4ad 400 Watt 4-Channel Amplifier | Class-AD with Constant Power **Brand:** rockford fosgate **Price:** $855.23 **Availability:** ✅ In Stock ## Summary > ⚡ Compact Power, Unstoppable Sound – Own the Road, Own the Moment! ## Quick Answers - **What is this?** Rockford Fosgate Power T400X4ad 400 Watt 4-Channel Amplifier | Class-AD with Constant Power by rockford fosgate - **How much does it cost?** $855.23 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/20191156-rockford-fosgate-power-t400x4ad-400-watt-4-channel-amplifier-class) ## Best For - rockford fosgate enthusiasts ## Why This Product - Trusted rockford fosgate brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Built to Endure:** Rockford Fosgate’s legendary durability backed by a 2-year parts and labor warranty. - • **Space-Savvy Design:** Ultra-compact footprint fits seamlessly into any vehicle, from cars to UTVs without compromise. - • **Powerhouse Performance:** Delivers a robust 400 Watts across 4 channels for crystal-clear, high-impact sound. - • **Precision Audio Control:** On-board Punch EQ with +18dB boost at 45Hz and Butterworth crossover for tailored sound clarity. - • **Consistent Power Delivery:** Proprietary Constant Power tech ensures 25% more power stability at all impedance levels. ## Overview The Rockford Fosgate Power T400X4ad is a cutting-edge 400 Watt 4-channel Class-AD amplifier featuring proprietary Constant Power technology for consistent output at 2Ω and 4Ω loads. Its ultra-compact design makes it ideal for tight spaces in cars, trucks, motorcycles, and UTVs. Equipped with advanced audio tuning options like Punch EQ and Butterworth crossover, it delivers premium sound quality with legendary Rockford Fosgate reliability and a 2-year warranty. ## Description Buy Rockford Fosgate Power T400X4ad 400 Watt 4-Channel Amplifier | Class-AD with Constant Power: Multichannel Amplifiers - desertcart.com ✓ FREE DELIVERY possible on eligible purchases ## Features - Our ultra-compact (1.6” x 4.3” x 8.3”) Power T400X4ad 4-channel amplifier produces more power per square inch than any other model we make with 400 Watts of POWER - Proprietary Constant Power amps are the most powerful on the market, delivering up to 25% more power across all impedance loads (100 Watts x 4 @ 4-Ohm or 100 Watts x 4 @ 2-Ohm or 200 Watts x 2 @ 4-Ohm Bridged) - Proprietary Class-AD technology, featuring Constant Power to produce the same output at both 4-Ohm and 2-Ohm, making it perfect for hybrid, electric, small cars, trucks, motorcycles, and side-by-side UTVs - High-level auto turn-on, CLEAN circuit input/output clip detection, On-board Punch EQ with +18dB boost @ 45Hz and 12dB/octave Butterworth crossover make T400X4ad an impressive POWER house - Famous Rockford Fosgate build quality ensures that the T400X4ad will handle everything you throw at it! Full 2-year parts and labor warranty ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B00LMNLGDY | | Best Sellers Rank | #115,385 in Electronics ( See Top 100 in Electronics ) #246 in Car Multichannel Amplifiers | | Brand Name | Rockford Fosgate | | Customer Reviews | 4.7 4.7 out of 5 stars (118) | | Global Trade Identification Number | 00780687342388 | | Included Components | A Amplifier With Standard Accessories | | Item Dimensions | 11 x 3 x 6 inches | | Item Weight | 3 pounds | | Manufacturer | Rockford Fosgate | | Material Type | Electronic component material and epoxy | | Maximum Output Power | 400 watts | | Maximum Supply Voltage | 12 volts_of_direct_current | | Model | T400X4ad | | Mounting Type | Boat Mount | | Number of Channels | 4 | | Number of Items | 1 | | Number of Packs | 1 | | Output Power | 400 watts | | Package Type Name | box" or "installation kit | | Part Number | T400X4ad | | Specification Met | Implied 12v Standard Voltage and Potential Compliance With Industry-specific Audio Standards | | UPC | 780687342388 | | Unit Count | 1 Count | | Voltage | 12 volts | | Warranty Description | 1-Year Manufacturer Warranty | ## Product Details - **Item dimensions L x W x H:** 11 x 3 x 6 inches - **Manufacturer:** Rockford Fosgate - **Maximum Supply Voltage:** 12 volts_of_direct_current - **Mounting Type:** Boat Mount - **Voltage:** 12 volts ## Images ![Rockford Fosgate Power T400X4ad 400 Watt 4-Channel Amplifier | Class-AD with Constant Power - Image 1](https://m.media-amazon.com/images/I/61M8GZUoafL.jpg) ![Rockford Fosgate Power T400X4ad 400 Watt 4-Channel Amplifier | Class-AD with Constant Power - Image 2](https://m.media-amazon.com/images/I/61P7iYL7VxL.jpg) ![Rockford Fosgate Power T400X4ad 400 Watt 4-Channel Amplifier | Class-AD with Constant Power - Image 3](https://m.media-amazon.com/images/I/51blsFulMXL.jpg) ![Rockford Fosgate Power T400X4ad 400 Watt 4-Channel Amplifier | Class-AD with Constant Power - Image 4](https://m.media-amazon.com/images/I/6160NiCwC+L.jpg) ![Rockford Fosgate Power T400X4ad 400 Watt 4-Channel Amplifier | Class-AD with Constant Power - Image 5](https://m.media-amazon.com/images/I/51CkqPPe3QL.jpg) ## Questions & Answers **Q: Theses are just micro amps right? Can be used in car not just bikes** A: That is correct. You can use them for any application you would use a normal amp for. Because of their size they are typically used in settings that have very limited space. **Q: Does this amp come with any wiring? Looks like they changed the rca plug to something else on the amp** A: There is a molex that plugs into the amp that has the RCA's on it., I can offer you a very aggressive price on this unit and all needed install items. Simply text me at 512-750-8726 for a quote. Thanks!! **Q: is there a mounting plate for a 2012 victory cross country** A: Unfortunately, no. You would need to fabricate your own mounting plate. Thanks for your interest! **Q: Is this better in sound quality than Rockford's Prime line up ?** A: Yes! Absolutely I own both and sound is way better with the power series’s ## Frequently Bought Together - Rockford Fosgate T400X4ad Power 400 Watt Class-ad 4-Channel Amplifier - Rockford Fosgate T1650 Power 6.5" 2-Way Coaxial Full Range Speakers - Black (Pair) - Rockford Fosgate R2-500X4 Prime 500-Watt 4-Channel Amplifier --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.us/products/20191156-rockford-fosgate-power-t400x4ad-400-watt-4-channel-amplifier-class](https://www.desertcart.us/products/20191156-rockford-fosgate-power-t400x4ad-400-watt-4-channel-amplifier-class) --- *Product available on Desertcart United States of America* *Store origin: US* *Last updated: 2026-08-11*