Hifonics ZD-3350.1D Zeus Delta Mono Amplifier

The Hifonics ZD-3350.1D Zeus Delta is a compact Class D mono car amplifier designed for powering a subwoofer system. Its single-channel configuration concentrates output into a dedicated bass channel, making it suited to installations where low-frequency performance is the priority. It provides selectable power ratings for 1-, 2-, and 4-ohm subwoofer loads.

This amplifier is intended for drivers building or upgrading a vehicle bass system with a compatible subwoofer or wired subwoofer group. Its mono-only design keeps system planning straightforward when using a separate amplifier or factory power for full-range speakers. Speaker-level inputs can also help integrate the amplifier into systems without a traditional RCA preamp output.

The ZD-3350.1D uses a PWM MOSFET power supply and Class D topology, combining high-output bass amplification with a relatively compact amplifier footprint. An aluminum heat sink is used to help dissipate heat during operation. The amplifier also includes soft-start turn-on and protection diagnostics for overload and speaker-short conditions.

Onboard controls provide practical adjustment for a subwoofer system. The variable low-pass crossover operates from 50 to 250 Hz, while the subsonic filter adjusts from 15 to 40 Hz. A variable bass boost control provides 0 to 12 dB of adjustment, and the built-in bass control supports convenient level adjustment.

Installation-focused details include nickel-plated, high-temperature, impact-resistant RCA inputs and angled molded connection terminals for power, ground, and speaker wiring. DC Signal Sense can turn the amplifier on when it detects a signal at the RCA inputs, eliminating the need for a remote turn-on lead when that setup is appropriate. A wired bass remote is included for accessible bass-level control after installation.

Key Features

• Dedicated Mono Channel: Focuses the amplifier on subwoofer and low-frequency applications.
• Class D Design: Delivers efficient mono amplification in a compact chassis.
• Variable Low-Pass Filter: Lets you set the upper frequency range sent to the subwoofer.
• Adjustable Subsonic Filter: Helps limit very low frequencies below the selected cutoff.
• DC Signal Sense: Can activate the amplifier from an RCA input signal.
• Wired Bass Remote: Provides convenient adjustment of bass level from the cabin.

Design & Installation

The ZD-3350.1D has a black Zeus Delta chassis with an aluminum heat sink, molded connection terminals, and nickel-plated RCA inputs. Its end-panel LED protection diagnostics provide visible status indication for overload and speaker-short protection. The amplifier uses a compact digital Class D layout intended to conserve mounting space compared with larger traditional amplifier designs.

Use this amplifier with a subwoofer or subwoofer wiring arrangement that presents a supported 1-, 2-, or 4-ohm load. The manufacturer lists 2 AWG connections for the 12V and ground terminals, 12 AWG speaker-terminal wiring, and an external 175A fuse. Mount it securely with adequate ventilation, run appropriately fused power wiring directly from the battery, and set crossover, subsonic-filter, gain, and bass controls to suit the connected subwoofer system.