$349.99
Availability: 4 In Stock

4-Channel Class D Full-Range Amplifier, 100 W x 4 @ 2 Ω / 75 W x 4 @ 4 Ω - 14.4V


Utilizing our exclusive NexD™ high-speed switching technologies, the ultra-compact RD400/4 amplifier is engineered to deliver loads of audio output power, with incredible efficiency and low distortion. Don’t let its modern styling and small size fool you though, this little powerhouse churns out 100 watts of crystal-clear audio from each of its four channels into 2 ohms (14.4V, 1% THD) and is fully bridgeable, so it can be used as a 3-channel amplifier, or as a 2-channel amplifier producing a whopping 200W x 2 into 4 ohms.

For your convenience, the RD400/4’s controls can be found on top of the amplifier, beneath a protective cover, with all connections located along one side of its chassis. Studio-grade signal processing features include high or low-pass 12 dB / octave filters (defeatable) for each channel pair, with continuously variable frequency selection from 50-500 Hz, and dual-range, differential-balanced inputs capable of accepting most input voltage levels. Automatic turn-on capability (via signal sensing or DC-offset sensing) is standard equipment, along with all-new input type switches for bridging of stereo output channels without needing to use Y-adaptors.

Onboard LED-clipping indicators are also included with your RD400/4. This all-new, innovative feature lets you easily set your amplifier’s input sensitivity settings, quickly and accurately, with no special equipment needed. You’ll also find a set of preamp outputs on-hand, so you can pass signals to another amplifier, almost effortlessly. The RD400/4 features a durable, black powder-coated finish and a top-mounted, dual-color LED light strip that reports the overall status and condition.

Frequency Response 12 Hz - 22 kHz (+0, -1dB)
S/N Ratio, referred to highest rated power >104 dB below rated power (A-weighted, 20 Hz - 20 kHz noise bandwidth)
S/N Ratio, referred to 1 W >84 dB (A-weighted, 20 Hz - 20 kHz noise bandwidth)
Damping Factor @ 4 Ω >150 / 50 Hz
Damping Factor @ 2 Ω >75 / 50 Hz
THD+N @ Rated Power <1% @ 2 Ω per Ch.
Input Voltage Range @ RCA Inputs Switchable from 200 mV - 2 V RMS (Low) to 800 mV - 8 V RMS (High)
Min.Copper Power / Ground Wire Gauge 4 AWG wire
Fuse Rating 40 A (AFS, AGU or MaxiFuse™)
Filter Mode(s) Low-Pass or High-Pass
Filter Slope(s) 12 dB/octave
Filter Frequency Range 50 Hz - 500 Hz
Detented, Calibrated Filter Freq. Potentiometers No
Filter Defeat Function Yes
Remote Level Control No
Remote Level Modes N/A
Channel Input Mode Switch Yes (2/4 ch.)
Pass-Through Preamp Output Buffered
Source Channel Selection for PreOuts No
Height (H) 2.13 in / 54 mm
Width (W) 9.78 in / 248 mm
Depth (D) 6.96 in / 177 mm
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JL Audio RD400/4: 4 Ch. Class D Full-Range Amplifier, 400 W

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We ship most orders the same day if placed before 3pm Eastern time Monday - Thursday. Orders placed after 3pm will ship the next day. Orders placed after 3pm on Friday will be shipped on Saturday, orders placed after 3PM on Saturday will be shipped on Monday. We are glad to announce Saturday shipping – however we do not ship on Sundays. We do not ship on US holidays or whenever our carriers take holidays i.e., USPS, UPS, and FedEx.


Returns - Online Purchases

Purchases made on freemanscarstereo.com are eligible for a return request within 30 days of order delivery. A return authorization number is required for all returns: any return that does not contain a return authorization number will be refused and returned to the sender. Full refunds are only issued for unopened and unused products. 

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Refunds

> Full Refunds

In order to be eligible for a refund, item(s) must be unused, unopened, and in the same condition in which it was received. There is no restocking fee for brand new/unopened/sealed items.

Customers will receive a return confirmation email within 1-2 business days that will confirm receipt of their return and confirm whether or not that return will be eligible for a refund. Approved refunds will be processed automatically via a credit back to the customer’s original payment method. 

> Partial Refunds

Any item that is damaged, has missing parts, or is not in its original condition is subject to a restocking fee of up to 50% of the order total. If the box or seal is opened there is a 20% restocking fee. 

Installed, used, or damaged items may not be eligible for return or, will incur a restocking fee. These situations include but are not limited to the following:

  • Any sign of use - including signs of installation, scratches, physical marking, screw holes, or similar.
  • Tags, stickers, or other manufacturer labels removed or tampered with.
  • Missing parts or the original product packaging is damaged.
  • A product that is returned bearing a serial number that does not match the serial number of the product shipped by Freeman’s Car Stereo.
  • Physical damage from drops, liquid, mishandling or similar.
  • Damage due to improper return packing by customer.
  • Mounted or used subwoofer enclosures and speaker boxes.
  • Blown, punctured or fried speakers, subwoofers, and amplifiers.

 

> Late or Missing Refunds

Refunds can take a week or longer to post to your account depending on your bank. If you haven’t received a refund yet, please contact your credit card company or bank. If your refund has still not been posted within 2 weeks of being issued please contact us via email: esales@freemanscarstereo.com.

 

> Online Gift Returns

If the item was marked as a gift when purchased and shipped directly to the gift recipient, the gift recipient will receive a store credit for the value of the return. Once the returned item is received, a freemanscarstereo.com gift certificate will be mailed.

Warranty Exchanges*

We follow all manufacturer’s policies regarding the processing of warranties. Warranty exchanges or repairs are subject to eligibility periods based on purchase date as well as specific manufacturer policy.

Missing serial numbers, physical damage, or customer abused products will void warranties, repairs, and exchanges. 

Items That Cannot Be Returned

  • - Gift cards
  • - Opened and/or used installation parts will not be accepted for return or refund.