HELIX AMPLIFY 204 DIRECT – AC20410
Compact 4-Channel Amplifier with DirectDSP Input – Designed for Precision Audio Systems
The AMPLIFY series introduces a new standard in amplifier engineering, focusing on clarity, power, and efficiency. Each model in this range is purpose-built for a specific function, ensuring optimal results without unnecessary complexity. The AMPLIFY 204 DIRECT reflects this philosophy — compact, powerful, and designed to work seamlessly with DSP-based sound systems for unmatched precision and control.
Key Highlights
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Compact Class D 4-channel amplifier delivering up to 240 watts RMS @ 2Ω per channel
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Fully bridgeable channels for adaptable system configurations
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Designed specifically for HELIX DSP and other external processors using DirectDSP input
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Clipping LED for precise and quick gain calibration
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Start-stop compatible down to 6V, ensuring steady performance even during voltage dips
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Efficient thermal design with low heat output and high power density
Designed for Modern DSP Systems
The AMPLIFY 204 DIRECT is built for installations where an external DSP handles signal processing. Its DirectDSP inputs allow the signal to reach the amplifier without internal filtering or unnecessary processing, ensuring total signal transparency. Each stereo input includes a stereo/mono switch that enables bridged operation using only one RCA line — removing the need for Y-adapters and simplifying system setup.
With a carefully engineered gain stage and clipping indicator, users can fine-tune input levels with confidence. The result is a cleaner, more controlled sound with maximum clarity, especially in systems focused on accuracy and dynamic performance.
Compact Power with Intelligent Design
Despite its small size, this amplifier delivers outstanding output and sound precision. The 4 x 100W RMS @ 4Ω or 4 x 190W RMS @ 2Ω power ratings make it suitable for both multi-channel and bridged configurations. It can also be set up as a 3-channel system with a subwoofer or as a 2-channel powerhouse for demanding front-end setups.
The exterior design emphasizes functionality and minimalism. A removable top cover conceals controls and terminals, maintaining a clean, professional appearance. Its solid aluminum body helps dissipate heat efficiently while blending seamlessly into modern vehicle interiors.
Specifications
Power RMS (≤ 1% THD+N @ 14.4V):
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@ 4Ω: 4 × 100 W
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@ 2Ω: 4 × 190 W
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Bridged @ 4Ω: 2 × 380 W
Max Output Power (per channel): Up to 240 W RMS @ 2Ω
Amplifier Type: Class D
Inputs: 4 × RCA / Cinch, 1 × Remote In
Input Sensitivity: 1 – 8 V
Input Impedance: 67 kΩ
Outputs: 4 × Speaker Terminals
Frequency Response: 10 Hz – 20 kHz
Signal-to-Noise Ratio (A-weighted): 99 dB @ full output
Distortion (THD @ 1 kHz, 1 W / 4Ω): < 0.012%
Distortion (THD+N @ 1 kHz, 1 W / 4Ω): < 0.02%
Damping Factor: 70
Operating Voltage: 10.5 – 16 V (with tolerance down to 6 V for 5 seconds)
Idle Current: 1.1 A
Fuse Rating: 2 × 30 A (LP-Mini fuse)
Power Consumption: Max 70 A @ 12 V DC
Temperature Range: -40°C to +70°C
Additional Features: Start-stop support, clipping LED, DirectDSP input
Dimensions (H × W × D): 40 × 248 × 114 mm (1.58 × 9.76 × 4.49 in)
Included in the Box
