SA 400.4 400W RMS 4-Channel Car Amplifier - 2 Ohm Stable Full Range Class D Car Audio Amp, Bridgeable, Built-in LPF/HPF Crossover, MOSFET Power Supply, Compact Under-Seat
Condition: New
$57.79
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Availability:
12 left in stock
Arrives
Friday, Oct 30
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At a glance
- Condition
- New
- Style
- 400 Watt
- Model
- SA 400.4
- Dimensions
- 2.2 x 4.37 x 5.67 in
- Material
- Plastic, Metal
- Maximum Supply Voltage
- 12 V DC
- Mounting Type
- Surface Mount
- In the box
- Digital Car Audio Amplifier w/ Crossover & MOSFET Power Supply
- Warranty
- Limited
Features 5
- HONEST 400W RMS POWER 100W RMS x4 @ 4 Ohms, 200W RMS x4 @ 2 Ohms. No inflated peak numbers real, continuous power that performs at high volume without distortion or shutdown
- OHM STABLE ON ALL 4 CHANNELS Run your front/rear speakers and still have headroom for a subwoofer setup. Handles demanding loads without overheating thanks to MOSFET power supply technology.
- BUILT-IN LPF & HPF CROSSOVER Dial in your sound directly on the amp. Low-Pass Filter for subs, High-Pass for speakers. No extra crossover unit needed clean installation, tuned audio.
- ULTRA-COMPACT CLASS D DESIGN Fits under seats or in tight trunk spaces where traditional amps won't go. Runs cool and efficient, no bulky heatsink required. Perfect for factory upgrade builds.
- WHAT'S IN THE BOX Soundfy SA 400.4 amplifier, mounting hardware, and owner's manual with wiring diagram. Compatible with all head units via RCA input. Questions? Contact Soundfy support directly.
Specs 15
| Item dimensions L x W x H | 2.2 x 4.37 x 5.67 inches |
|---|---|
| Manufacturer | Soundfy |
| Maximum Supply Voltage | 12 V DC |
| Minimum Supply Voltage | 12 V DC |
| Mounting Type | Surface Mount |
| Number of Channels | 4 |
| Output Power | 400 watts |
| Package Type Name | Box |
| Maximum Output Power | 400 watts |
| Item Dimensions | 2.2 x 4.37 x 5.67 inches |
| Material Type | Plastic, Metal |
| Model | SA 400.4 |
| Brand Name | Soundfy |
| Number of Items | 1 |
| Part Number | SDF-CN-SA001NA |
No specs match.
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Friday, Oct 30
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
Great Product. Easy to install. Works Great.
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
Loud as Fark!
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
Ok mini amp
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
GREAT equality
Style: 400 Watt
AMAIZING sound quality in a teeny tiny package
Reviewed in the United States on June 5, 2025 by FTS
decent sound for small footprint
Style: 400 Watt
NOT TOO BAD, tiny but decent sound, would recomend
Reviewed in the United States on April 30, 2025 by Jr
Died after about 1 minute while setting gains!
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
I like
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
Decent for the Price and Size
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