The Helvia ZEUS 4350CA PA power amplifier features four independent Class-D channels, each with a line transformer and an output of 350 W on a 100 V line. Each channel can operate on a 70/100 V line or at low impedance (4–16 Ω). The inputs and outputs are balanced and use XLR connectors, while the power outputs use Phoenix (Euroblock) connectors.

Each channel features a volume control, VU meter and clip LED indicators, and a gain control on the rear panel. The HPF has a cutoff frequency of 400 Hz, while the cooling system uses a fan whose speed adjusts according to the internal temperature.

• Type: PA power amplifier
• Channels: 4
• Amplifier class: Class-D
• Power per channel at 100 V: 350 W
• Operating lines: 70/100 V or 4–16 Ω
• Inputs and outputs: Balanced XLR
• Power outputs: Phoenix (Euroblock)
• Per-channel controls: Volume and gain
• Per-channel indicators: VU meter and clip LEDs
• HPF: 400 Hz cutoff frequency
• Frequency response: 80–20 kHz or 400 Hz–20 kHz
• Damping factor: >300 at 100 Hz
• THD: <0.1% at 1 W and 1 m
• Per-channel protection: Power-on muting, signal limiter, thermal protection, and current limiting
• Cooling system: Fan with speed controlled according to internal temperature
• Rack size: 19″, 2U
• Width: 484 mm
• Height: 400 mm
• Depth: 88 mm
• Weight: 20 kg