【Important Notice for International Buyers – Tomoayax Premium Audio Hi-Fi Japan】
■ Voltage Compatibility
This product is designed exclusively for use in Japan (AC 100V, 50/60Hz).
Many regions use 120V or 220–240V.
Using this product without a proper transformer in such voltage environments may result in malfunction, overheating, or serious and irreversible damage.
■ Plug Type
This product uses a Japanese plug (Type A or B).
A plug adapter may be required depending on your region.
■ Transformer Requirement (Very Important)
A transformer is required for safe use.
A plug adapter only changes the plug shape and DOES NOT convert voltage.
Using this product without a transformer may cause serious and irreversible damage.
■ Buyer Responsibility
As this is high-end audio equipment, the buyer is fully responsible for confirming compatibility with their local voltage (100V / 120V / 220–240V) and usage environment before purchase.
■ No Return / No Refund Policy
We do NOT accept returns or refunds for:
・Voltage mismatch (including 120V and 220–240V environments)
・Use without a transformer
・Plug incompatibility
・Damage caused by improper setup or usage
■ Liability
We are not responsible for any damage, malfunction, or performance issues caused by improper use or incorrect voltage conditions.
■ Final Notice
Please ensure full understanding of the above before purchasing.
Use only under the correct voltage environment.
[4-Channel Car Audio Amplifier] The Class D 4-channel design supports stereo and bridge connections, allowing for flexible system configurations. Utilizing the Infineon IR4322 chip, it delivers clean, full-range sound with low distortion and low heat generation, stably driving car speakers.
【HiFi Sound Quality】Fosi Audio's home audio technology is applied to the car audio field. Utilizing JRC/ST operational amplifiers, it achieves THD+N ≤0.008%, SNR ≥100dB, and an ultra-low noise floor ≤200μV. This surpasses the sound quality specifications of typical car amplifiers in the same class.
【High Efficiency 88% & Bridge Compatible】The Class D design minimizes heat generation while achieving 100W x 4 output. In bridge mode, it provides 320W x 2 output at 4Ω, supporting subwoofer driving. REM wire allows for synchronized power ON/OFF with the head unit. Furthermore, it features an adjustable HPF/LPF crossover (50-250Hz).
【Compact Design & Wide Vehicle Compatibility】The unit measures approximately 7.3 x 3.9 x 1.7 inches, allowing for installation under seats or in limited spaces. It is compatible with DC 10-16V gasoline vehicles and is suitable for a wide range of vehicles including sedans, SUVs, trucks, MPVs, Jeeps, and vans, making installation easy.
【Smart Cooling & Protection Features】Equipped with a CNC-machined aluminum finned heatsink, it suppresses temperature rise and ensures stable playback over long periods. Built-in protection circuits against overheating, short circuits, overvoltage/undervoltage, and reverse polarity. In addition, it is equipped with an LED indicator that allows you to check the status at a glance.
Fosi Audio CA30 4-Channel Car Amplifier, Class D, Independent Crossover, RCA/High-Level Input Compatible, 88% Efficiency, 100W x 4 (4Ω) / 320W Bridged, Low Noise, Compact HiFi Car Stereo Amplifier, Japanese Instruction Manual
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