SA 400.4 4-Channel Digital Car Audio Amplifier, 400W RMS 2 Ohms Stable, Compact Class D Multi-Channel Amp with Crossover & MOSFET Power Supply, Full-Range Sound Quality
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This item is eligible for return within 30 days of receipt
To qualify for a full refund, items must be returned in their original, unused condition. If an item is returned in a used, damaged, or materially different state, you may be granted a partial refund.
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Availability:
In Stock.
Arrives
Sunday, Aug 17
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Style: 400 Watt
Features
- High-Powered Sound & Clear Output: Elevate your car stereo with 400 Watts RMS across four channels, giving you louder, cleaner audio to combat road noise. Whether youre pumping bass or clarifying vocals, the Soundfy SA 400.4 ensures a more immersive ride.
- Compact & Sleek Class D Design: Designed for easy installation in tight spaces, this mini amplifier features advanced Class D technology that reduces heat and distortiongiving you powerful performance without bulky equipment.
- Reliable 2 Stable Operation: Experience consistent power with a 2-ohm stable setup. Perfect for running both speakers and subwoofers, it efficiently handles varied car or motorcycle audio configurations without sacrificing sound quality.
- Precise Crossover Controls: Tweak your systems output for optimal clarity. Built-in LPF & HPF settings let you customize full-range audio or isolate specific frequencies, ensuring crisp highs and punchy lows in every genre of music.
- Durable Build & Safety Features: Equipped with MOSFET power supply and built-in short-circuit protection, the SA 400.4 amps up reliability for long-term use. Enjoy the confidence of a robust, heat-managing amplifier that keeps your setup safe and your music sounding great.
Item dimensions L x W x H: 2.2 x 4.37 x 5.67 inches
Voltage: 12 Volts (DC)
Manufacturer: Soundfy
Maximum Supply Voltage: 12 Volts (DC)
Minimum Supply Voltage: 12 Volts (DC)
Product Dimensions : 2.2 x 4.37 x 5.67 inches; 1.08 Pounds
Item model number : SA 400/800
Date First Available : January 15, 2024
Manufacturer : Soundfy
Country of Origin : China
Best Sellers Rank: #36,525 in Electronics (See Top 100 in Electronics) #49 in Car Multichannel Amplifiers
#49 in Car Multichannel Amplifiers:
Customer Reviews: 4.3 4.3 out of 5 stars 141 ratings
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Sunday, Aug 17
Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
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Top Amazon Reviews
Style: 400 Watt
I have an aftermarket, Android radio that did not provide enough power for my speakers. It has right and left low level outputs that I could have used for an external amplifier, however, I would not be able to adjust the speaker output for front to back in the Jeep which I need. I needed just a little more amplification, so this worked well for my application. It plugged directly between my Android radio and the connector, so no real wiring needed. It has low level outputs, but I did not need those (my radio has these). The low-level output seems to have a gain adjustment which is nice. I used a different brand before this one and had issues, so I spent a little more on this one and it works. I also have a subwoofer with amplifier in the Jeep which I needed to turn up the gain on to compensate for the added boost from this (not surprising). Right now, I have a little too much overall boost from this (and my subwoofer) and I wish that this amp had a way to turn down the gain. Otherwise, I am very happy with it. Also, I expected some level of noise on the system (boosting an amplified signal usually results in audio artifacts) however, it's really not noticeable (it's a Jeep and pretty noisy anyway). If you are an audiophile, you probably would want to go a different way.. but then again, if you are an audiophile, you would not have an Android radio in your vehicle.
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Reviewed in the United States on June 23, 2025 by Alan Garner
Style: 400 Watt
I have this thing in my Golf cart… And it pumps the sound HELLA LOUD!! Can hear it for miles!!!
Reviewed in the United States on July 5, 2025 by Travis Smith
Style: 400 Watt
It's actually holding up more than a year later. Pumps my Jbl door speakers great. 1 minor problem is it gets hot pretty quick due to size.
Reviewed in the United States on April 14, 2025 by South956
Style: 400 Watt
AMAIZING sound quality in a teeny tiny package
Reviewed in the United States on June 5, 2025 by FTS
Style: 400 Watt
NOT TOO BAD, tiny but decent sound, would recomend
Reviewed in the United States on April 30, 2025 by Jr
Style: 400 Watt
The one I received died as soon as I started to adjust the gains. Sent it back.
Reviewed in the United States on February 27, 2025 by Jon B
Style: 400 Watt
Running my 2 skar audio 6.5 and 2 3 way 6x9 for 3 months now, love it. good audio quality. Honestly when I first got it I didn’t notice the little things to adjust the audio so it used to cut out when I turned it up too much but it’s too much for my speakers I have it like half way up and it’s loud would recommend
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Reviewed in the United States on February 21, 2025 by Isidro
Style: 400 Watt
TL;DR: The internals are limiting the capability of this amp from becoming a 5/5 product. Pros: Affordable, Small Build, Simple Set-up, Good Power, Good looks. Can't find a cheaper amp than this one that is also in this small of a package. Drives my 6x9 pair and 6.5 components really well. Can't say the same for tweeters. Cons: Hiss on Tweeters (or any high sensitivity drivers), A shared "ground" between two channels. I was so impressed by them driving those woofers that I bought 3 more before I tested this on my tweeters and midrange coaxials. Thank the heavens for cancellations because I dreaded to hear that hissing sound coming from my tweeters. I have a DSP that can output more than the 4v output my Head Unit delivers on the RCAs so it's not a noise floor issue. I unplugged the RCAs and the hiss was still present. From what I have learned, this amp does not have a good filter to come along with it meaning it will produce high frequency noise regardless of how much voltage you pump through your RCA. Granted, the noise was low enough that you could probably drown it out if you haven't done any acoustic treatment to your vehicle and are always traveling through highways. If you are younger than me (31), it would probably be more apparent to you but for me, the noise is evident enough for me skip this amp and give it a 3/5. If you are older, you probably wouldn't even notice the noise and if that is the case, enjoy this powerhouse!
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Reviewed in the United States on January 29, 2025 by Frank