Fosi Audio ZA3 Balanced Stereo Amplifier – 2-Channel or Mono Power with 48V Supply (TPA3255)

Meet the Fosi Audio ZA3: compact versatility for your listening room

The ZA3 is a compact, yet capable amplifier designed to adapt to a range of setups—from a desktop music rig to a small home theater system. It switches between stereo and mono modes, letting you tailor power delivery to your speakers and room without swapping hardware. This isn't just about volume; it's about how clean, consistent power can enhance the listening experience across content from music to movies.

Smart, flexible power

• Dual-mode operation: stereo up to 180W, mono up to 235W, so you can match the output to your speakers.
• Pair two ZA3 units in mono to create a bigger, more dynamic system when you want extra impact.
• Includes a robust 48V power supply to support sustained performance even during demanding passages.

Balanced, low-noise signal path

• Balanced input with XLR and 1/4" TRS compatibility helps minimize interference and preserve signal integrity.
• 12V trigger-in enables simple synchronization with other devices for smoother on/off control.

Audiophile-grade components for clarity

• TPA3255 high-end Class-D amp chip paired with premium Japanese NCC, ELNA, and German WIMA capacitors, plus Japanese Sumida inductors.
• SINAD up to 89dB, SNR up to 106dB, and a very low noise floor around 150µV for clean, detailed sound.

Smart cooling for reliable performance

Built on an advanced heat-dissipation concept, the ZA3 uses a larger chassis, side vents, and dust covers to maintain steady output over extended listening.

Sound customization and future-proofing

• Five swappable op-amps support a hands-on approach to shaping left/right channels, balanced input, and subwoofer output. Try compatible DIP8 op-amps to explore tonal changes.

In real rooms, the ZA3 can serve a desktop stereo system, a compact bookshelf or tower setup, or a two-unit mono configuration for larger spaces. These benefits come from design choices that emphasize solid power delivery, clean paths, and flexible integration. As with any audio gear, outcomes depend on your specific speakers, room acoustics, and source quality; the ZA3 makes a measured, adaptable upgrade possible rather than a guaranteed result.