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Helix Amplify 201 X-Over 24V Mono Class D Subwoofer Amplifier 750W with Active Crossover for 24-Volt Systems
A mono Class D subwoofer amplifier from the Helix Amplify 2-Series, the Amplify 201 X-Over 24V delivers 250W RMS at 4Ω, 450W RMS at 2Ω, and 750W RMS at 1Ω (up to 850W RMS maximum) at 28.8V, with 2 high-level ADEP.3 inputs (3-32V), 1 RCA input, adjustable active lowpass (50-250Hz, 12dB/Oct), adjustable subsonic filter (10-50Hz, 12dB/Oct), adjustable phase (0-180°), auto turn-on via music signal, 114dB SNR at full power, THD below 0.003% at 100Hz, damping factor of 200, cable remote control, Start-Stop capability to 12V, and 21-32V operating range specifically for 24-volt truck, bus, and commercial vehicle electrical systems.
Product Overview
The Helix Amplify 201 X-Over 24V is the dedicated 24-volt edition of the Amplify 201 X-Over subwoofer monoblock, sharing identical audio specifications, output power, crossover controls, and form factor with the 12V version but powered from a 24V electrical system (21-32V operating range). It is specifically engineered for subwoofer upgrades in trucks, buses, and commercial vehicles where 24V electrical systems are standard and replacing OEM audio components is often restricted. The dedicated 24V power supply ensures stable output, high reliability, and consistent audio performance during long operating cycles and demanding commercial vehicle conditions.
Output power is rated at 28.8V (the 24V equivalent test voltage to the 12V version's 14.4V): 250W RMS at 4Ω, 450W RMS at 2Ω, and 750W RMS at 1Ω with music signal (up to 850W RMS maximum). THD at 100Hz below 0.003% and SNR of 114dB at full power are identical to the 12V version. The damping factor of 200 provides strong speaker control for tight, accurate bass reproduction. Start-Stop capability maintains stable operation during voltage drops to 12V for up to 5 seconds.
The 2 high-level ADEP.3 inputs (3-32V, 9-33Ω) accept signals from factory head units and high-voltage premium OEM systems up to 32V RMS, with auto turn-on from the music signal eliminating the need for a remote wire. The active crossover provides adjustable lowpass (50-250Hz, 12dB/Oct), adjustable subsonic filter (10-50Hz, 12dB/Oct), and 0-180° phase control. A cable remote control input and included cable remote allow external volume adjustment after installation. Fused at 2 x 15A LP-Mini (APS) for up to 40A at 24V DC. The removable top cover conceals all connections and controls.
Note: the in-box item list in the source data references "AMPLIFY 204 X-OVER – 24V Edition" which appears to be a source data error. The product is the AMPLIFY 201 X-OVER – 24V Edition per the confirmed SKU.
Features & Benefits
24-Volt Power Supply - Designed for Trucks, Buses, and Commercial Vehicles: The Amplify 201 X-Over 24V operates from a 24V electrical system (21-32V), making it the purpose-built subwoofer upgrade solution for trucks, buses, coaches, and commercial vehicles where standard 12V subwoofer amplifiers cannot operate.
750W RMS at 1Ω - Up to 850W RMS Maximum at 28.8V: Identical output capability to the 12V version: 250W RMS at 4Ω, 450W RMS at 2Ω, and 750W RMS at 1Ω with music signal (up to 850W RMS maximum at 28.8V), for 2 x 2Ω subwoofers in parallel, DVC subwoofers, or multiple subwoofers at a 1Ω combined load.
2 High-Level ADEP.3 Inputs with Auto Turn-On - Up to 32V RMS: The 2 high-level ADEP.3 inputs (3-32V) accept the elevated speaker output voltages common in premium factory truck and bus sound systems up to 32V RMS. ADEP.3 prevents OEM system error messages. Auto turn-on activates the amplifier from the music signal without a separate remote wire.
Active Adjustable Lowpass Filter - 50-250Hz at 12dB/Oct: Fully adjustable lowpass filter for precise subwoofer crossover integration without requiring an external DSP processor or crossover unit.
Active Adjustable Subsonic Filter - 10-50Hz at 12dB/Oct: Adjustable subsonic filter removes infrasonic content to protect the subwoofer from mechanical overexcursion.
Adjustable Phase Control - 0-180°: Continuously adjustable phase control aligns subwoofer output phase with the main speaker system.
114dB SNR at Full Power - THD Below 0.003% at 100Hz: Identical audio performance to the 12V version, providing professional-grade audio quality in the 24V commercial vehicle environment.
Start-Stop Capability to 12V: Maintains stable operation during voltage drops to 12V for up to 5 seconds, protecting audio output during engine cranking events in 24V Start-Stop commercial vehicle platforms.
Cable Remote Control: The included cable remote control allows external volume adjustment from a convenient cab location without accessing the amplifier directly.
Compact 40 x 248 x 114mm - Removable Top Cover: Identical dimensions to the 12V Amplify 201 X-Over for installation in tight truck cab and bus dash locations. Removable top cover conceals connections and controls.
What's in the Box
- Helix Amplify 201 X-Over 24V Amplifier
- 1 x Cable Remote Control
- 2 x Allen Key
- 1 x Connection Cable
- 2 x Fuse
- Mounting Material
- Instruction Manual
Technical Specs
| Specification | Detail |
|---|---|
| SKU | AMPLIFY 201 X-OVER 24V |
| Brand | Helix |
| Range | Amplify 2-Series |
| Variant | X-Over 24V Edition |
| Channels | 1 (Mono) |
| Amplifier Class | Class D |
| Built-in DSP | No |
| Power RMS at 4Ω (28.8V) | 1 x 250W |
| Power RMS at 2Ω (28.8V) | 1 x 450W |
| Power RMS at 1Ω (28.8V) | 1 x 750W (with music signal) |
| Max Output at 1Ω | Up to 850W RMS |
| THD at 100Hz, 1W into 4Ω | Less than 0.003% |
| THD+N at 100Hz, 1W into 4Ω | Less than 0.02% |
| SNR at Full Power | 114dB (A-weighted) |
| Damping Factor | 200 |
| RCA Input | 1 x RCA Mono (0.5-6V, 8kΩ) |
| High-Level Inputs | 2 x High-Level ADEP.3 (3-32V, 9-33Ω) |
| Remote Control Input | Yes (Cable Remote) |
| Outputs | 1 x Speaker |
| RCA Preout | None |
| Frequency Response | 10Hz-250Hz |
| Lowpass Filter | 50-250Hz Adjustable, 12dB/Oct |
| Subsonic Filter | 10-50Hz Adjustable, 12dB/Oct |
| Phase Control | 0-180° Adjustable |
| ADEP.3 | Yes |
| Auto Turn-On | Yes (via Music Signal) |
| Operating Voltage | 21-32V DC (Stable to 12V for 5 Seconds) |
| Power Rating | DC 24V, 40A Max |
| Idle Current | 750mA |
| Fuse | 2 x 15A LP-Mini (APS) |
| Operating Temperature | -40°C to +70°C |
| Start-Stop Capable | Yes (to 12V) |
| Top Cover | Removable |
| Dimensions | 40mm x 248mm x 114mm |
Compatible With
The Amplify 201 X-Over 24V is compatible with 21-32V DC vehicle electrical systems including standard 24V truck, bus, and heavy commercial vehicle platforms. RCA input accepts 0.5-6V from aftermarket head units and DSP outputs. High-level ADEP.3 inputs accept 3-32V from factory OEM head units and high-voltage premium factory systems with auto turn-on. This is the 24V edition and is not compatible with standard 12V vehicle electrical systems. Confirm subwoofer impedance matches the 1Ω, 2Ω, or 4Ω rated output configurations before purchase.
Frequently Asked Questions
What is the difference between the Amplify 201 X-Over 24V and the standard Amplify 201 X-Over?
Both are identical in audio performance, output power, crossover controls, dimensions, input options, and ADEP.3 integration. The 24V edition operates from a 21-32V DC supply for 24V truck and bus electrical systems, is rated at 28.8V, and has Start-Stop protection to 12V with 2 x 15A fusing at 40A DC 24V. The standard version operates at 10.5-16V for 12V vehicle systems.
Is the Amplify 201 X-Over 24V compatible with standard 12V vehicles?
No. The Amplify 201 X-Over 24V requires 21-32V DC operation. It is not compatible with standard 12V vehicle electrical systems. For 12V installations refer to the AMPLIFY 201 X-OVER.
Does the 24V edition deliver the same output power as the 12V version?
Yes. The Amplify 201 X-Over 24V delivers identical output power ratings: 750W RMS at 1Ω (up to 850W RMS maximum), 450W RMS at 2Ω, and 250W RMS at 4Ω, measured at 28.8V which is the 24V system equivalent of the 12V version's 14.4V test voltage.
Does the Amplify 201 X-Over 24V require a remote wire?
No. The auto turn-on function activates the amplifier from the music signal via the high-level inputs, eliminating the need for a separate remote wire in factory 24V system integrations.
Is the Amplify 201 X-Over 24V suited to trucks with high-output factory audio systems?
Yes. The high-level ADEP.3 inputs accept up to 32V RMS, covering the elevated speaker output voltages of premium factory audio systems common in luxury trucks and buses, with ADEP.3 preventing error messages during integration.
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