Fosi Audio CA30 4-ch power amp WITH HPF & LPF

[Mark185]

Let's stick to Fosi Audio CA30

Other units with similar crossover features, ideally to make direct comparisons.

Pending Amir's review how do you think the Fosi Audio CA30 ACTUAL power output compares to their claims?

Do you know other 4+ channel units just as clean and with similar built in crossover features, that put out similar or higher output power into 2-4Ω in a similar price range per channel?

If you want CA30 power measurements, they have been done by RAWCat and Audiokeller on YouTube and both men have a reputation for accuracy and honesty. These are my go-to's for information if Amir has not tested it yet. Nerius on RAWCat also compares it to a Helix amp using the same Infineon chips.

 

[john61ct]

Amir said on the way, so I can wait

but thanks

 

[john61ct]

Pretty braindead YouTuber IMO wasre of time

TLW you can reverse the guts inside the enclosure if the logo facing up is important to you

 

[SportyQ]

The low cost is a factor, but being DC powered is required in my case.

Please link to better alternatives if you know any

JOhn. I posted in another thread to you about this. You seem to want amps that require a DC power supply. They all do. Every amp ever made. They have DC power rails. A power supply converts AC to the required DC voltage the amp design requires (or DC to DC power supply)

You can buy class D amp modules that require separate external power supply. ICEpower and nCore are a couple of abundant brands. You can buy class AB amp modules also. AND You can build your own modules from kits and or chip amps. If you want to build your own amps ESP in australia (one of many sources) has circuit boards to build amps, a forum and tech articles (the site/company owner is a former university instructor) You can also bypass the power supply of your favorite amp (difficult and a bad idea).

Parts-Express; where this amp in the discussion is sold, have many amp modules which require an external power supply.

I wonder if your are just trolling for interest in your residential power system ? Are you a UPS or solar panel installer ?

Where in the world did you get the idea a car audio amp can't be installed on carpet. They are not designed to thermal couple to their mounting location. Which would be carpet, an unfinished amp board of wood or plastic or sound proofing on steel in a automobile cabin.


The only installation guideline I have ever read (and it is amp model specific) would be not mounting an amp upside down as the heatsink could not radiate the heat as designed.

 

[john61ct]

Thanks so much for responding!

I've never owned anything with carpet (yuck) so not sure where that came from. But when the heat sink is **all four sides** of the case, that could be a factor. There is no "right side up" with CA30, in fact the video above showed the guy flipping the guts around.

...

As to your main point

> require a DC power supply. They all do. Every amp ever made. They have DC power rails


Take grid-powered Class A /AB units like Adcom GFA-555 or Schiit Vidar, or even Class D ICEpower Hypex NCORE.

For someone without strong DIY (at the soldering chips to board level) skills that statement is maybe theoretically true.

But bypassing whatever is internally converting the grid AC and constructing DCDC PSUs to feed massive internal high-voltage DC power rails, e.g. up to 80Vdc

may be possible (or even easy to some), but NOT me at this stage of my learning curve.

Same with building amps from board level kits, if it's going to save most of say, $200 without soldering, and also includes the case, buttons knobs good connectors, then sure, please drop the links.

You seem to want amps that require a DC power supply.

Not seem to, that is what I want.

...

"Requiring an external power supply" is fine, but the amp needs to itself accept staightforward DC input under 60V, ideally <48. TPA3255 based is OK too, I can just use 3e A7, but for some channels I want more power.

In this case having the magnitude crossovers built in, is a real plus for good value, bandpass would be even better! without paying $100 more.

I am only considering "car gear" because those are DESIGNED to plug into a DC power infrastructure, and DC-DC conversion below 60V can be accomplished pretty easily and safely with OTS UL-rated (or CE) finished products.

Please recommend better value amps than CA30 at high SQ, or measured higher RMS power amps

The AC powered examples above are at the high end of my budget preferences.


> I wonder if your are just trolling for interest in your residential power system ? Are you a UPS or solar panel installer ?

Just silly, I am only asking for help on Audio tech, I am a consumer, 100% retired.