Rockford Fosgate T400X2AD 400-Watt 2-Channel Amplifier for Harley


American Hard Bag Members Only Special DealFree amplifier power harness

For a limited time, registered members get a free amplifier power harness kit ($79 value) when purchasing this item. See More Details Here

One of the Most Powerful Compact Amplifiers on the Market Today

This amplifier is perfect for very high-power fairing speakers or saddlebag lid speakers and woofers. 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. The ultra-high efficiency and small footprint make this amplifier perfect for any Harley stereo system.


    • Balanced RCA-type inputs for both factory and aftermarket radios
    • Bridgeable for ultra insane powerful full-range output to a single driver
    • Built-in adjustable high and low pass crossovers
    • Designed specifically for high vibration, heat, and moister applications
    • Charging system friendly to Harley stator and battery
    • Top-mounted controls
    • Dual fan cooled
    • Real-time thermal sensing
    • Dual extruded heat sinks
    • Discrete surface mount technology
    • 4/2 Ohm muti-impedance Constant Power
    • Differential inputs with high-level auto turn-on feature
    • 8 AWG power/ground connector w/ upgraded RCA connectors
    • Remote-Out feature when using high-level inputs
    • 4 Ohm bridged capable
    • C.L.E.A.N. input/output clip detection and indicator LEDs


    • Model: T400X2AD
    • Number of Channels: 2
    • Total Power: 400 Watts (Sum of Rated Power)
    • Rated Power: 200 Watts x 2 @ 4-Ohm (RMS); 200 Watts x 2 @ 2-Ohm; 400 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: >75% (average)
    • Total Harmonic Distortion: 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; Low-Pass: 50Hz - 250Hz @ 12dB/Octave; All-Pass: Yes
    • Power Wire Gauge: 8 AWG
    • Power Input Connector: Detachable Compression Terminal
    • Speaker Wire Gauge: 16 AWG
    • Speaker Output Connector: 4-Pin Harness
    • Cooling: Dual Fan Cooled
    • Operating Voltage: 9 - 16 VDC
    • Average Current Draw: 23 A (13.8V Music)
    • Max. Current Draw: 45 A (13.8V Sinewave)
    • Dimensions: 1.6" x 4.3" x 7.0" (L x W x D)


    • 1998 - Present Harley Touring Bike Fairing

    What's In The Box?:

    • (1) 2-Channel Amplifier
    • (1) Owners Manual


    Typically ships in 1 to 3 business days. We process and build orders in the order in which we receive them. This method allows our experts to review every order and check that it is correct for your specific bike, which means sometimes you might wait a little longer to receive your order, but it's always worth it!


    • Rockford Fosgate Components: 1 Year
    Shipping This Item Ships to The United States 

    Items built to order have a build time of up to two weeks before shipping. Items that are not built to order (e.g. amplifiers, speakers, .etc) typically ship in 2 - 3 business days. Many of our speaker kits feature machined special parts and customized wire harnesses that are built to order. We process and build orders in the order that we receive them. This allows our experts to go over every order and check that your particular order is correct for your particular bike. This means sometimes you have to wait a little longer to get your order but it's always worth it! 

    Once You Order Does Ship

    You will receive an automated email with tracking information as soon as our shipping department creates a shipping label for your package.  


    There are many more speakers, amplifiers, and kits to choose from than what you see here.

    [powr-form-builder id=1f43a15c_1475460501]

    Please allow 10 business days for your order to arrive if it is an item that is built to order. Items that are not built to order (e.g. amplifiers, speakers, .etc) typically ship the next business day.We process and build orders in the order that we receive them. This allows our experts to go over every order and check that your particular order is correct for your particular bike. This means sometimes you have to wait a little longer to get your order but it's always worth it! 

    Returns are easy, simply contact us for a returns number and send your item to our returns centre for fast processing. We'll get you a replacement or refund in a snap! You can find our refund policy here.

    Here are 5 great reasons to buy from us:



    Easy Returns

    Returns are easy, simply contact us for a return Authorization number and send your item to our returns center for fast processing. We'll get you a replacement or refund in a snap! You can find our refund policy here.



    Your part is guaranteed to fit. We test fit every part we sell on actual bikes in order to verify fitment on each model, generation, and in each possible location. You can be sure that if we have stated that a part fits your bike, that it will, or your money back. You will find model, year, and location fitment details on most product pages.

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    Ordering from American Hard Bag is 100% safe and secure so you can rest easy. Your personal details are never shared, sold or rented to anyone either.



    We Thoroughly Test Every Part We Sell on a Real Bike. There are a lot of parts out there that we refuse to sell. If it’s not up to our high standards, it never makes it to this website. We have parts that fit various budgets and levels of insanity, but all parts we carry are exceptional performers.



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    Questions? Call us at 888-311-0016

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    • No Credit Needed refers to Snap’s lease-purchase financing that considers more than just credit reports to determine approvals or denials. In fact, applications for Snap’s lease-purchase financing aren’t even reported to TransUnion, Equifax, or Experian. Our proprietary decisioning process allows us to look beyond bad credit, no credit, and bankruptcy to approve more applicants.

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    Questions? Call us at 888-311-0016

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    1. U.S. residents over the age of 18 (or over 19 for Alabama or Nebraska residents) are eligible, provided your identity can be verified.

    2. Checking your rate does not affect your credit score as only a soft pull is completed to check your eligibility. If you choose to finance your purchase with Bread after your pre-approval, we will not perform a hard inquiry with any of the three major credit reporting agencies. Once you have taken out a loan, Bread may report repayment information about your account to the consumer reporting agencies, which may impact your credit score. We may also obtain your credit profile from smaller credit reporting agencies.

    3. You will not be able to adjust your loan terms after you have checked out.

    4. You can apply via the website of any participating online store. When you’re ready to buy, click on Bread’s® financing button to get your rate in seconds. If you pre-qualify, you will be presented with the financing terms offered and sample payment amounts. Add the item to the retailer’s shopping cart and choose Bread® or “Pay Over Time” as your preferred method of payment when you check out.

    Got Questions? 

    Call American Hard Bag and we can help to see if Snap or Bread Finance is right for you!
    1(888) 311-0016