Helix C Four (C – Series)

HELIX C FOUR

Audiophile Sound Quality Meets Powerful Performance

The HELIX C FOUR is a premium 4-channel Class AB amplifier designed for true audiophiles who demand both refined sound quality and powerful output. Built with meticulous attention to detail, this amplifier features ultra low-noise, distortion-free Class A drivers and 32 hand-selected MOSFET transistors, delivering exceptional clarity, dynamics, and speaker control. With an incredible damping factor of 1,000 @ 4 Ohms, the C FOUR commands any speaker setup with authority and precision.

High-End Analog Engineering with Digital Expandability

At its core, the C FOUR is an analog masterpiece—but it is also fully prepared for the digital age. By integrating the optional HELIX Digital Input Module (HDM 2), the C FOUR gains two optical digital inputs (SPDIF) and supports high-resolution audio signals up to 96 kHz. These signals are decoded by cutting-edge 32-bit BurrBrown D/A converters, offering pristine digital-to-analog conversion for uncompromising sound quality. This makes it the perfect companion for HELIX DSPs and other digital sources.

Class AB Sound Quality, Class A Precision

With eight high-grade MOSFET transistors per channel, this Class AB amplifier offers an exceptionally broad frequency range, making it ideal for High-Resolution Audio content. The Class A driver stage ensures ultra-clean signal amplification with minimal noise or distortion, setting a new benchmark for analog audio quality in car sound systems.

Robust Power Management & Versatility

The C FOUR’s regulated switching power supply guarantees consistent output, even during fluctuating car battery voltages, and is fully Start-Stop capable—functioning flawlessly even when supply voltage drops to as low as 6V. Advanced thermal management with temperature-controlled fan operation, a microprocessor-based monitoring system, and built-in active crossovers (high-pass, low-pass, bandpass) give this amplifier unparalleled stability and customization.

Special Features

Start-Stop Compatibility

Designed for modern vehicles, the HELIX C FOUR continues operating even during engine crank when the battery voltage may dip to 6 Volts. Its regulated power supply ensures stable performance across a variety of electrical conditions.

High-Resolution Audio Support

With an extended audio bandwidth, the C FOUR is capable of reproducing studio-grade sound quality. It is a perfect match for High-Resolution Audio files, delivering all their fine detail and dynamic range.

Optional HDM 2 Digital Input Module

With the HDM 2 module installed, users gain access to two optical digital inputs capable of handling up to 96 kHz sampling rate audio. This future-proofs the amplifier, allowing seamless integration with modern DSP-based audio systems.

Precision Build and Premium Components

• 24-carat gold-plated terminals for maximum conductivity
• Quad-layer PCB with extra-thick 70µ copper traces for optimal current flow
• Built with SMD (Surface Mounted Device) technology for enhanced reliability and compact design

Features Summary

• 4-channel Class AB amplifier optimized for High-Resolution audio
• Class A driver stage with ultra-low distortion and noise
• 32 hand-picked MOSFET power transistors for maximum output precision
• Damping factor of 1,000 @ 4 Ohms for superior speaker control
• Optional HDM 2 module for dual SPDIF optical digital inputs (up to 96 kHz)
• 32-bit BurrBrown D/A converters (with HDM 2) for pristine audio fidelity
• Start-Stop ready with stable performance down to 6V
• Built-in active crossover (HPF, LPF, BPF)
• Massive gold-plated terminals, advanced PCB design, and compact footprint