Our First Car Amplifier Under Independent Dyno Testing

We recently had the opportunity to see our first car audio amplifier, the Fosi Audio CA30, independently tested and reviewed by the well-known YouTube channel Williston Audio Labs. Known for detailed amplifier dyno testing and honest technical evaluations, the channel put the CA30 through certified power testing, real-world playback, and a full internal teardown.

As this is our first step into the automotive audio market, we were especially interested to see how the CA30 would perform under independent measurement.

During the initial overview, the reviewer highlighted the amplifier’s compact size. Measuring approximately 7.25 by 4 by 1.75 inches, the CA30 was designed to fit into tight installation spaces such as under seats or behind interior panels. Our goal with this product was to create a small but capable four-channel Class D amplifier that offers flexibility without sacrificing output performance.

The review also pointed out one of the key design features of the CA30: full crossover control on all channels. Each channel pair supports high-pass, low-pass, or full-range operation. We included both high-level and RCA inputs to ensure compatibility with factory and aftermarket systems, making integration easier across different vehicle setups.

In certified dyno testing at 1% total harmonic distortion, the CA30 delivered 99 watts per channel at 4 ohms, closely matching its rated 100 watts per channel specification. At 2 ohms, the amplifier produced approximately 149 watts per channel under slightly reduced voltage conditions, with dynamic testing showing even higher short-term output. When bridged at 4 ohms, the amplifier measured approximately 323 watts per channel, again aligning closely with its published rating of 320 watts.

We were pleased to see that the independent testing confirmed that the CA30 performs in line with its stated specifications. The reviewer specifically noted that the amplifier did not exaggerate its power ratings, and that efficiency levels were consistent with expectations for a compact Class D design.

From a sound perspective, the reviewer described the amplifier as having a very low noise floor and clean playback characteristics. While sound quality can vary depending on the system and installation, we designed the CA30 with stable output and low-noise operation as core priorities.

The teardown portion of the review provided a closer look at the internal design, including the dual Class D chip configuration and compact internal layout. Due to the amplifier’s small footprint, the 30A fuses are internally mounted. Space efficiency was an important design consideration, and we worked to balance size constraints with functional reliability.

In summary, the review highlighted the CA30’s compact form factor, verified power output, flexible crossover configuration, and low noise performance. Areas noted for consideration included the four-channel RCA input requirement and internal fuse placement—both decisions influenced by the compact design approach.

As our first car amplifier, the CA30 represents an important step for us as we expand beyond home audio into automotive applications. We appreciate independent reviewers like Williston Audio Labs who take the time to conduct detailed testing and share transparent results with the community.