RD400/4
Product info:
- Featured in our article: Best 4-channel car amplifiers for 2026
- 4-channel car amplifier
- 75 watts RMS x 4 at 4 ohms (100 watts RMS x 4 at 2 ohms)
- 200 watts RMS x 2 bridged at 4 ohms (4-ohm stable in bridged mode)
- Class D amplifier design with NextD™ switching amp technology
- differential-balanced inputs help eliminate noise
- variable low- and high-pass filters (50-500 Hz, 12 dB/octave)
- LED clip lights help set gain
Other Features:
- blue LED accent lighting
- preamp inputs and outputs
- speaker-level inputs ( speaker wire to RCA adapter required)
- 4-gauge power and ground leads and a 40-amp fuse recommended — wiring and hardware not included with amplifier
- no onboard fuses — when installing multiple amps in a system, an additional 40-amp in-line fuse between the distribution block and the amplifier is recommended
- 9-13/16"W x 2-1/8"H x 7"D
- warranty: 2 years
Exceptional Sound Quality
Auto Sound Design – a friendly, locally-owned company specializing in audio installation and equipment. We value quality and believe that our customers should have the best sound systems in their vehicles. Our top of the line technologies and personalized solutions make us a top choice for anyone looking to upgrade their audio system in their vehicles, we even do audio installations for boats!
FAQs
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What payment methods do you accept?
When purchasing an audio installation or audio equipment we accept all major credit and debit cards, including but not limited to Express, Amex, Visa, and Mastercard. Additionally, we accept payment for audio installations and equipment via PayPal for the convenience of our customers.
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What shipping methods do you use?
We ship all of our audio installation equipment via the Canada Post. All shipping rates for our audio installation equipment are calculated by Canada Post and determined by the size, shape, and weight of the order.
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What if my product arrives damaged?
We apologize if you receive any damaged audio installation equipment. Please contact us as soon as possible so we may assist in finding a solution.
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What is your return policy?
We offer a 30-days after purchase return policy on our audio installation equipment. If you're looking to return any audio installation equipment, please email or call us with your name, order number, the reason for returning, and product name.
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Privacy Policy
Our audio installation site does not sell your information to any third parties. Our website is 100% secure and we only ask for your contact information, such as phone number and email, so that we can contact you about your order, or if you have any questions. We do not sell this information. We do not require any other additional information such as social security numbers. At check-out, we require credit card information for payment processing, but this information will not be stored or shared by the company. Personal information such as name and address will also be kept private under our privacy policy guidelines.
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Terms of Use
All images and information on this website are either property of Auto Sound Design or licensed. When visiting our audio installation site all customers are agreeing to appropriately use all content and follow all copyright laws. If any image or content is found to be used without permission legal action may be brought against the offender.

