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frontpagecvp33 posted Yesterday 12:10 AM
frontpagecvp33 posted Yesterday 12:10 AM

Fosi Audio CA30 100Wx4 Car Amplifier

+ Free Shipping

$112

$139

19% off
Fosi Audio
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Fosi Audio has Fosi Audio CA30 100Wx4 Car Amplifier for $139.99 - $27.99 when you apply discount code CA30EB20 at checkout = $112. Shipping is free.

Thanks to community member cvp33 for finding this deal.

About this item:
  • 4 Channel Car Audio Amplifiers: Class D 4-channel design supports stereo connection and bridging for flexible system configs. Infineon IR4322 chip delivers clean, full-range sound to drive your vehicle's speakers with low distortion and minimal heat
  • HiFi Sound Quality: Brings Fosi Audio's home audio technology to the car audio world. Features JRC/ST op-amps with THD+N ≤0.008%, SNR ≥100dB, and ultra-low noise floor ≤200μV—specifications that outperform standard car amplifiers in its class
  • 88% High Efficiency & Bridgeable: Class D design minimizes heat while delivering 100W x 4, and bridgeable mode provides 320W x 2 @ 4Ω for subwoofers. REM wire enables linking on/off with your head unit, while adjustable HPF/LPF crossover (50–250 Hz)
  • Compact Universal Fit: Measures 7.3" x 3.9" x 1.7" to fit under seats or tight spaces. Compatible with 10–16V DC gasoline vehicles, including sedans, SUVs, trucks, MPVs, Jeeps, and vans, for easy installation
  • Smart Cooling & Protection: CNC aluminum finned heatsink keeps temps low for stable, long-session sound. Built-in protection against overheating, short circuits, over-/under-voltage, and reverse polarity; handy LED indicators keep you informed

Editor's Notes

Written by johnny_miller | Staff
  • Our research indicates this offer is $20.99 lower (16% savings) than the next best price from a reputable merchant at the time of this post.
  • Please see the original post for additional details & give the forum comments a read for helpful discussion.

Original Post

Written by cvp33
Community Notes
About the Poster
Deal Details
Community Notes
About the Poster
Fosi Audio has Fosi Audio CA30 100Wx4 Car Amplifier for $139.99 - $27.99 when you apply discount code CA30EB20 at checkout = $112. Shipping is free.

Thanks to community member cvp33 for finding this deal.

About this item:
  • 4 Channel Car Audio Amplifiers: Class D 4-channel design supports stereo connection and bridging for flexible system configs. Infineon IR4322 chip delivers clean, full-range sound to drive your vehicle's speakers with low distortion and minimal heat
  • HiFi Sound Quality: Brings Fosi Audio's home audio technology to the car audio world. Features JRC/ST op-amps with THD+N ≤0.008%, SNR ≥100dB, and ultra-low noise floor ≤200μV—specifications that outperform standard car amplifiers in its class
  • 88% High Efficiency & Bridgeable: Class D design minimizes heat while delivering 100W x 4, and bridgeable mode provides 320W x 2 @ 4Ω for subwoofers. REM wire enables linking on/off with your head unit, while adjustable HPF/LPF crossover (50–250 Hz)
  • Compact Universal Fit: Measures 7.3" x 3.9" x 1.7" to fit under seats or tight spaces. Compatible with 10–16V DC gasoline vehicles, including sedans, SUVs, trucks, MPVs, Jeeps, and vans, for easy installation
  • Smart Cooling & Protection: CNC aluminum finned heatsink keeps temps low for stable, long-session sound. Built-in protection against overheating, short circuits, over-/under-voltage, and reverse polarity; handy LED indicators keep you informed

Editor's Notes

Written by johnny_miller | Staff
  • Our research indicates this offer is $20.99 lower (16% savings) than the next best price from a reputable merchant at the time of this post.
  • Please see the original post for additional details & give the forum comments a read for helpful discussion.

Original Post

Written by cvp33

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Top Comments

EXTREMEODD
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Williston Audio Labs has a video on this that dropped yesterday. Solid amp.
https://www.youtube.com/watch?v=bycYfpNsP70

24 Comments

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Original Poster
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Yesterday 12:14 AM
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cvp33
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Yesterday 12:14 AM
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Our community has rated this post as helpful. If you agree, why not thank cvp33

In case you're not familiar with the Infineon chipset with digital MOSFET.
The Infineon IR4322 is a high-performance, 2-channel integrated Class D audio amplifier chipset designed to deliver high-quality sound with minimal heat, often utilized in compact, high-efficiency audio applications. It is frequently highlighted as a core, premium component in specialized audio equipment, such as the Fosi Audio CA30 car amplifier.
SPECS:
Design: Integrated 2-channel analog input Class D audio amplifier in a small 7x7 mm PQFN44 package.
Performance: Capable of delivering up to 100W x 2 output.
Efficiency: High-efficiency design (around 88%) that often allows for operation without a mechanical heatsink in typical music playback, reducing system size.
Protection Features: Integrated self-resetting protection for overcurrent, over-temperature, and under-voltage.
Audio Quality: Designed for low distortion and high-fidelity sound, featuring clip and fault reporting.
Car Audio: Used in compact 4-channel amplifiers to provide high-power, low-distortion sound.
Home Audio: Suitable for home theater systems, powered speakers, and docking stations.
The IR4322 is part of a family (including the IR4321) that integrates a PWM controller and digital audio MOSFETs to achieve a high power-to-size ratio.
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Yesterday 12:20 AM
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EXTREMEODDYesterday 12:20 AM
1 Posts
Williston Audio Labs has a video on this that dropped yesterday. Solid amp.
https://www.youtube.com/watch?v=bycYfpNsP70
Original Poster
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Yesterday 12:25 AM
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cvp33
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Yesterday 12:25 AM
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Quote from EXTREMEODD :
Williston Audio Labs has a video on this that dropped yesterday. Solid amp.
https://www.youtube.com/watch?v=bycYfpNsP70
I ordered mine this afternoon. $112 is a no-brainer. I have 2 mini amp setups with VU meters from them. Absolutely love their stuff. Aiyima is very good as well.
Just watched the test video. 650watts X 2 bridged @ 2ohms…..That's amazing.
Last edited by cvp33 February 9, 2026 at 06:23 PM.
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Yesterday 12:53 AM
545 Posts
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dirtpeopleYesterday 12:53 AM
545 Posts
How does this compare with my old school Zapco??? Rollin' some Swass.
1
Yesterday 01:13 AM
107 Posts
Joined Sep 2010
WarlockYesterday 01:13 AM
107 Posts
Coupon does not work for me. :-(
1
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Yesterday 01:24 AM
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cvp33
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Yesterday 01:24 AM
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Quote from Warlock :
Coupon does not work for me. :-(
Sorry I copied it wrong
CA30EB20
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Yesterday 01:26 AM
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cvp33
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NOT EXPIRED BTW and coupon is fixed

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Yesterday 02:00 AM
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WarlockYesterday 02:00 AM
107 Posts
Worked with the updated code! Thanks OP!
Yesterday 08:18 PM
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BozanimalYesterday 08:18 PM
339 Posts
Quote from dirtpeople :
How does this compare with my old school Zapco??? Rollin' some Swass.
If you're talking about a true old school Zapco with a class AB amp design it won't hold a candle to modern car audio amplifiers. It genuinely shocking how efficient they are when you look back at Alpine and Rockford amps you could cook an egg on at max power.

Tripath completely changed the game in the early 2000's with their "Class T" chips. Texas Instruments introduced a competing technology shortly after and they're in almost everything now, including both desktop and this Fosi amp.

Good for consumers, honestly.
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Yesterday 08:46 PM
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androidf58Yesterday 08:46 PM
943 Posts
Quote from cvp33 :
I ordered mine this afternoon. $112 is a no-brainer. I have 2 mini amp setups with VU meters from them. Absolutely love their stuff. Aiyima is very good as well.
Just watched the test video. 650watts X 2 bridged @ 2ohms…..That's amazing.
Is it actually safe to run at 2 ohms in bridged mode? Everything I see on the product page says 2 ohms in stereo only.
Yesterday 09:51 PM
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Joined Feb 2013
JawtonYesterday 09:51 PM
1,456 Posts
Quote from dirtpeople :
How does this compare with my old school Zapco??? Rollin' some Swass.
oh man i used to have the most incredible zapco amp. brings back memories.
1
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This user is an Expert in Home & Home Improvement
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firebirdude
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Quote from androidf58 :
Is it actually safe to run at 2 ohms in bridged mode? Everything I see on the product page says 2 ohms in stereo only.
It is not. This is why BigD did it at the end of the video, as he normally does, taking monoblocks to 0.8 or 0.5ohm loads. But hell, the amp held up for at least his short burst test. Would it handle 2 ohm bridged for a hour of heavy music listening? Hard to say. But the loads in the SMD dyno are static dummy loads. Much harder on the amplifier than a dynamic inductive load of a speaker. So if it handles the dyno run, should do very well with speakers connected.
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Original Poster
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Today 12:33 AM
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cvp33
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Today 12:33 AM
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Quote from androidf58 :
Is it actually safe to run at 2 ohms in bridged mode? Everything I see on the product page says 2 ohms in stereo only.
No, he was testing it to push the limits. Hit 650watts + on both channels and didn't blow a fuse. I'm simply amazed at what these chip sets can do. Back in the day a real 4x100w amp was 32" x 12" and about 4" thick with a heat sink. This thing is 4"x7". Impressive.
Today 01:58 AM
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phubarToday 01:58 AM
586 Posts
Good to drive 4 mx650 jl speakers in boat?

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Original Poster
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cvp33
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Today 02:28 AM
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Quote from phubar :
Good to drive 4 mx650 jl speakers in boat?
Easy, 60w rms, this is 4x100

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