B-Stock HELIX AMPLIFY 204 X-OVER

B-Grade Description:
Returned item with minor installation marks on the mounting holes; shipped in original packaging.

With AMPLIFY, HELIX redefines the standards of modern amplifier design through a contemporary interpretation of classic concepts. Instead of “one-size-fits-all” solutions, AMPLIFY relies on specialized models that are precisely tailored to different applications. This rigorous philosophy guarantees that every model delivers maximum performance for its intended purpose—while focusing on what really matters.

The 2 Series marks the entry point into the AMPLIFY platform—and at the same time forms its technical and sonic core. These compact Class D amplifiers combine power, a fully bridgeable multichannel architecture, and outstanding efficiency with practical integration capabilities. Brilliant and precise highs, controlled mids, and tight, powerful bass—with sound quality and performance far exceeding expectations for its class, the 2 Series brings every facet of natural and powerful sound to any vehicle. Whether in the DIRECT, X-OVER, or DSP variants (available starting in summer 2025): everything is offered, from flexible 6-channel configurations for full-range applications to a high-performance 1-channel subwoofer powerhouse. 

AMPLIFY 204 – The Versatile Solution for Full-Range Applications

The AMPLIFY 204 amplifiers combine four fully bridgeable outputs with excellent sound and impressive performance—ideal for powerful front-channel or multichannel setups. Whether in classic 4-channel operation, a 3-channel configuration with a subwoofer, or bridged 2-channel solutions, the 204 adapts flexibly to the requirements of a wide variety of vehicles and system designs. With an output of 4 x 100 watts RMS at 4 Ω, 4 x 190 watts RMS at 2 Ω, or 2 x 380 watts RMS bridged at 4 Ω, it delivers more than enough power for ambitious setups. Whether in the X-OVER version with an active crossover or as the DIRECT model for minimalist operation with external DSPs—the focus is always on high-quality sound performance

Sound and Performance—Above the Standard

The AMPLIFY 2 Series not only stands for perfectly tailored solutions for a variety of applications, but also for the clear goal of far exceeding the expectations of its class in terms of sound quality and performance in each of these applications. All amplifiers in the series offer brilliant sound quality, low distortion, and outstanding signal-to-noise ratios—paired with bridgeable multi-channel outputs throughout for maximum power and installation flexibility. The result: a series that doesn’t merely define its class but sets new standards within it—making it the top choice for anyone seeking application-oriented performance without compromise

AMPLIFY X-OVER – Maximum Flexibility for Classic Upgrades

The AMPLIFY X-OVER models are the ideal choice for conventional sound upgrades with factory radios or aftermarket head units. At the heart of the system is the integrated, active crossover with high-quality, adjustable high-pass and low-pass filters as well as an input mode switch—it enables precise signal tuning and simplifies the implementation of a wide variety of system configurations. Whether for an active front system with separate control of tweeters and woofers, the operation of passive front and rear systems, or the combined use of a front system with a subwoofer via bridged channels: The X-OVER models offer maximum flexibility in system design. Switchable high-level and RCA inputs with up to 16 V input sensitivity allow for integration into virtually any factory or aftermarket environment. The integrated ADEP.3 circuit ensures error-free communication with OEM radios, while an automatic power-on function minimizes installation effort. As an additional feature, the DirectDSP function allows the input signal to bypass the crossover entirely and be routed directly to the power amplifier—ideal for anyone who wants to upgrade their system with an external DSP at a later date

Form Follows Function

The design of the HELIX AMPLIFY 2 Series combines modern functionality with a clean, tech-inspired look. Its compact dimensions allow for flexible installations, even in tight spaces. A removable cover conceals connections and controls, providing additional protection and creating a clean, high-quality overall appearance. Matte finishes, precise lines, and a minimalist design language create a stylish, exclusive look that blends seamlessly into any modern vehicle interior.

Features

• Highly efficient amplifier with high output power of up to 240 watts RMS @ 2 ohms per channel for impressive dynamics and powerful sound
• Bridgeable output channels for flexible system configurations and maximum power output
• Very compact design for easy integration, even in limited spaces
• Start-stop capability down to a 6V supply voltage for uninterrupted performance
• Integrated, active crossover with high-pass and low-pass filters, as well as an input mode switch for optimal system configuration
• DirectDSP function – The input signal bypasses the built-in active crossover and is sent unfiltered to the power amplifier
• Smart high-level input with ADEP.3 for seamless integration into OEM audio systems
• Advanced Class D design for high efficiency with minimal heat generation

Technical Specifications

What's Included

1 x HELIX AMPLIFY 204 X-OVER amplifier
2 x Allen wrenches
1 x Mounting hardware
1 x Connection cable
2 x Fuses
1 x User manual