This amplifier for its size, it is amazing. I am currently running 4 x JBL Stadium CS62CF (110W RMS @ 3OHMS) and the amplifier is totally not stressing. The sound quality is very good and setup was a breeze. The clipping LED makes it more easier to setup using a standard 1000Hz signal.

This amplifier for its size, it is amazing. I am currently running 4 x JBL Stadium CS62CF (110W RMS @ 3OHMS) and the amplifier is totally not stressing. The sound quality is very good and setup was a breeze. The clipping LED makes it more easier to setup using a standard 1000Hz signal.

This product looks and seems very worthy of being of one of the best amps for enthusiasts who want performance and clarity in their car wherever they go.

This product looks and seems very worthy of being of one of the best amps for enthusiasts who want performance and clarity in their car wherever they go.

Good amp

Good amp

Great Sound, excellent performance

Very satisfied
Sounds better than some premium entry level equipment

Very good small solution for nice audio !

Scam of a company. Their shipping department is full of idiots. Their support requires YOU to prove they didn’t ship the entire order, somehow. I will never shop Fosi again!

Was this a good review for you? Can you stop emailing me now?? You owe me $129 for that amp. Dirt bags.

I purchased 2 of them for my Lexus. before i installed them I ended up putting both of them in my sons car on some cheaper DS-18 coaxial's. They sounded great. So I purchased 3 more for my car and installed them on some CDT component sets and they have a very old school class AB sound and clarity. They were small enough to put all 3 under the passenger seat. I wish they would build a 4 channel 800 watt version.

I purchased 2 of them for my Lexus. before i installed them I ended up putting both of them in my sons car on some cheaper DS-18 coaxial's. They sounded great. So I purchased 3 more for my car and installed them on some CDT component sets and they have a very old school class AB sound and clarity. They were small enough to put all 3 under the passenger seat. I wish they would build a 4 channel 800 watt version.

Setup: Goldhorn 810 pro rca to Fosi CA30 and Sony XM-1ES.

The sound is clean and nice. Unfortunately I found a rare compatibility issue that made me resold this nicely sound amp to a friend. My Sony XM-1ES is an overprotective subwoofer amp that will go into protect mode if it detect any abnormal in the power system. And making my Fosi CA30 and the Sony turn on via remote signal at the same time from my Goldhorn trigger exactly that protect mode.

Scenario:
1) Connect both Fosi and Sony remote and rca cable to Goldhorn then turn on. -> Sony go into protect mode.
2) Connect both Fosi and Sony remote cable to Goldhorn but leave out either RCA cable on Sony or Fosi -> turn on normally.
3) Connect both Fosi and Sony RCA normally but use time delay relay on Sony's remote signal so that Fosi turn on first, 2 seconds Sony turn on later -> both turn on fine. No protect mode on Sony.

So my only conclusion (especially from scenario 2) is that when turn on. Fosi send something (noise ground short or whatever) back through the RCA to the DSP. That ground are normally shared among all RCA ports so that made its way to Sony subwoofer amp and trigger protect mode. If Fosi turn on first, then Sony later. Then both works fine since Sony isn't doing its check right when Fosi send something to RCA ground. It's unfortunate. And I hope Fosi improve the turn on sequence to be cleaner later.

Setup: Goldhorn 810 pro rca to Fosi CA30 and Sony XM-1ES.

The sound is clean and nice. Unfortunately I found a rare compatibility issue that made me resold this nicely sound amp to a friend. My Sony XM-1ES is an overprotective subwoofer amp that will go into protect mode if it detect any abnormal in the power system. And making my Fosi CA30 and the Sony turn on via remote signal at the same time from my Goldhorn trigger exactly that protect mode.

Scenario:
1) Connect both Fosi and Sony remote and rca cable to Goldhorn then turn on. -> Sony go into protect mode.
2) Connect both Fosi and Sony remote cable to Goldhorn but leave out either RCA cable on Sony or Fosi -> turn on normally.
3) Connect both Fosi and Sony RCA normally but use time delay relay on Sony's remote signal so that Fosi turn on first, 2 seconds Sony turn on later -> both turn on fine. No protect mode on Sony.

So my only conclusion (especially from scenario 2) is that when turn on. Fosi send something (noise ground short or whatever) back through the RCA to the DSP. That ground are normally shared among all RCA ports so that made its way to Sony subwoofer amp and trigger protect mode. If Fosi turn on first, then Sony later. Then both works fine since Sony isn't doing its check right when Fosi send something to RCA ground. It's unfortunate. And I hope Fosi improve the turn on sequence to be cleaner later.

This replaced a very expensive Zapco 204dSQ amplifier that was rated at 150x4 rms. The sound quality is excellent and I have zero noise or turn on/off pops. I will say the potentiometers on the gains are very sensitive and dialing in the gain required what seems like millimeter adjustments and many people having issue with sound likely have the gain set wrong. Dynamic and Powerful and tiny with zero added noise. Who can ask for more? I can, turn this amp into a 600 watt Mono block next.

This replaced a very expensive Zapco 204dSQ amplifier that was rated at 150x4 rms. The sound quality is excellent and I have zero noise or turn on/off pops. I will say the potentiometers on the gains are very sensitive and dialing in the gain required what seems like millimeter adjustments and many people having issue with sound likely have the gain set wrong. Dynamic and Powerful and tiny with zero added noise. Who can ask for more? I can, turn this amp into a 600 watt Mono block next.

Good sound
Good price
At a ridiculously small size
Highly recommend

Good sound
Good price
At a ridiculously small size
Highly recommend

I was sceptical because of the low price but i learned a lesson after watching the detailed power Tests of the Fosi ca 30 on YouTube made by Audiokeller. He did a second video with a superb sound demo tested under same circumstances like older legendary class AB amplifiers and I was shocked 😳 I had to buy it and did not regret it - a bargain ! Well done Fosi , hope you will continue car audio amplifiers and produce a subwoofer amp 😊 fingers crossed!🤞

I was sceptical because of the low price but i learned a lesson after watching the detailed power Tests of the Fosi ca 30 on YouTube made by Audiokeller. He did a second video with a superb sound demo tested under same circumstances like older legendary class AB amplifiers and I was shocked ?? I had to buy it and did not regret it - a bargain ! Well done Fosi , hope you will continue car audio amplifiers and produce a subwoofer amp ?? fingers crossed!??

I was a little sceptical at first as it was Fosi’s first car amp. To be honest its a great compact amp, that sounds far better than it should at this price point,

I was a little sceptical at first as it was Fosi��s first car amp. To be honest its a great compact amp, that sounds far better than it should at this price point,

Power and ground cables must be AWG #4 . 🤔🤔🤔
This size can handle 150A . Why so big ?

Power and ground cables must be AWG #4 . ??????
This size can handle 150A . Why so big ?

Six days to greece. Very nice. I’ ll test in a few days and i’ ll buy another one.

Six days to greece. Very nice. I�� ll test in a few days and i�� ll buy another one.

Small size fits in my dash making for a powerful hidden system!!!

Small size fits in my dash making for a powerful hidden system!!!