HELIX AMPLIFY 204 X-OVER - 4 Channel Amplifier with crossover

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With AMPLIFY, HELIX redefines the design standards for modern amplifiers: through a contemporary interpretation of classic concepts. Instead of "one-size-fits-all" solutions, AMPLIFY focuses on specialized models precisely tailored to different areas of application. This rigorous philosophy ensures: Each model delivers maximum performance for its intended use, focusing on the essentials.

The 2 Series marks the entry into the AMPLIFY platform and also forms its technical and sonic core. These compact Class D amplifiers combine power, a fully connectable multi-channel architecture, and exceptional efficiency with convenient integration. Brilliant, precise highs, controlled mids, and powerful, powerful bass: the 2 Series brings all the facets of natural, powerful sound to every vehicle, with sound quality and performance levels far exceeding expectations in its class. Whether as a DIRECT, X-OVER, or DSP variant (from summer 2025): From flexible 6-channel configurations for full-range applications to a powerful 1-channel subwoofer, everything is available.

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-end or multi-channel configurations. Whether in classic 4-channel operation, a 3-channel configuration with subwoofer, or a bridged 2-channel solution, the 204 flexibly adapts to the needs of a wide range of vehicles and systems. With a power 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 offers more than enough power for ambitious configurations. In the X-OVER version with active crossover or as a DIRECT model for purist operation with external DSPs, the focus is always on high-quality sound performance.

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Technical Data

• RMS Power ≤ 1% THD+N at 14.4 V
• - 4 x 100 Watts at 4 Ohms
• - 4 x 190 Watts at 2 Ohms
• - 1 Ohm
• - 2 x 380 Watts at 4 Ohms
• - 2 Ohm Bridged
• - Maximum Power Per Channel Power per channel* Up to 240 Watts RMS at 2 Ohms
• Amplifier Technology Class D
• Inputs 4 x RCA
• or
• 4 high-level speaker inputs
• 1 x remote input
• Input Sensitivity RCA: 1 - 8 Volts
• High Level: 2 - 16 Volts
• Input Impedance
• RCA: 8 kOhms
• High Level: 9 - 33 Ohms
• Outputs 4 speaker outputs
• Output Voltage RCA -
• Signal Converter for Input Digital -
• Frequency range 10 Hz - 20,000 Hz
• Bass boost -
• High-pass 45 Hz - 400 Hz adjustable (can be deactivated)
• Low-pass 45 Hz - 400 Hz adjustable (can be deactivated)
• Bandwidth -
• Subsonic -
• Phase -
• High-pass/Low-pass edge steepness: High-pass: 12 dB/oct.
• Low-pass: 12 dB/oct.
• Subsonic Slope -
• Subsonic/Low-Pass Slope Steepness -
• Signal-to-Noise Ratio (A-weighted) 99 dB at maximum power
• Distortion Factor (THD at 1 kHz, 1 W into 4 ohms) < 0.012%
• Distortion Factor (THD+N @ 1 kHz, 1 W into 4 ohms) < 0.02%
• Distortion Factor (THD @ 100 Hz, 1 W into 4 ohms) -
• Distortion Factor (THD+N @ 100 Hz, 1 W into 4 ohms) -
• Damping Factor 70
• Operating Voltage 10.5 - 16 volts (max. 5 sec. up to 6 volts)
• No-load Current Draw 1,100 mA
• Fuse 2 x 30 A LP mini plug-in fuses
• Power Consumption DC 12 V ⎓ 70 A max.
• Operating temperature range: -40°C to +70°C
• Additional features: Adjustable active crossover, input mode selector, start-stop functionality, high-level input with auto-on, ADEP.3, DirectDSP function
• Dimensions (H x W x D): 40 x 248 x 114 mm