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Helix P One MK2 Mono Class D Amplifier 1500W RMS 1 Ohm Stable with Optical SPDIF
A high-performance mono Class D amplifier from Helix, the P One MK2 delivers 500W RMS at 4Ω, 880W RMS at 2Ω, 1500W RMS at 1Ω, and up to 1800W RMS maximum at 1Ω, with a damping factor above 450, frequency response to 40kHz, optical SPDIF input with SPDIF Direct In, BurrBrown 32-bit D/A converter, switchable subsonic filter, 110dB SNR from both analog and digital inputs, THD below 0.01%, Start-Stop capability, and 10.5-17V operating voltage.
Product Overview
The Helix P One MK2 is the second-generation flagship mono amplifier from the Helix P Series, delivering enormous subwoofer power with exceptional speaker control and High-Res audio quality from a compact 50 x 260 x 190mm housing. The extraordinarily efficient Class D concept produces up to 1500W RMS at 1Ω (up to 1800W RMS maximum) with very low heat dissipation and minimal dimensions, offering the highest power density of any amplifier in the Helix range.
The P One MK2 is designed for far more than driving subwoofers. Its frequency response extending to 40kHz, 110dB SNR from both analog and digital inputs, THD below 0.01%, and BurrBrown 32-bit D/A converter place it firmly in High-Resolution audio territory, making it equally suited for full-range amplifier applications where maximum quality is required. The damping factor above 450 provides maximum speaker control for tight, accurate bass reproduction across all subwoofer configurations.
The newly integrated optical SPDIF input (28-96kHz) accepts digital signals from compatible source units and processors including the Helix P Six DSP Ultimate via its optical output, enabling a fully lossless digital signal chain from source to speaker. The SPDIF Direct In switch routes the optical digital signal directly and losslessly to the power stage, bypassing analog conversion stages entirely. The Input Mode switch adapts the amplifier to the input signal type. A switchable subsonic filter at 21Hz with Butterworth 48dB/Oct slope protects subwoofers from subsonic energy. The regulated power supply maintains stable output power during voltage fluctuations and Start-Stop events. Operating voltage is 10.5-17V with stability to 6V for 5 seconds. Fused at 4 x 30A LP-Mini (APS) for up to 160A maximum power draw.
Features & Benefits
1500W RMS at 1Ω - Up to 1800W RMS Maximum: The P One MK2 delivers 500W RMS at 4Ω, 880W RMS at 2Ω, and 1500W RMS at 1Ω with maximum output of up to 1800W RMS at 1Ω, making it ideal for 2 x 2Ω subwoofers connected in parallel, dual voice coil subwoofers, or multiple subwoofers wired to a 1Ω combined load.
Class D with Extremely High Efficiency and Low Heat Dissipation: The P One MK2 Class D concept achieves extraordinarily high efficiency with minimal heat dissipation, enabling 1500W RMS output from a compact 50 x 260 x 190mm housing without the thermal management challenges of conventional high-power mono amplifiers.
Damping Factor Above 450 - Maximum Speaker Control: The damping factor above 450 provides exceptional speaker cone control, resulting in tight, accurate, and well-defined bass reproduction with fast transient response and minimal overhang across all subwoofer configurations.
Optical SPDIF Input with SPDIF Direct In Switch - Fully Lossless Digital Chain: The optical SPDIF input (28-96kHz) accepts digital signals from compatible source units and DSP processors, enabling a fully interference-free, ground-isolated, lossless digital signal path to the amplifier. The SPDIF Direct In switch bypasses analog conversion and routes the digital signal directly and losslessly to the power stage for the purest possible signal chain.
BurrBrown 32-Bit D/A Converter: The latest generation BurrBrown 32-bit D/A converter handles digital-to-analog conversion with exceptional resolution, contributing to the 110dB SNR and THD below 0.01% that characterise the P One MK2's High-Res audio credentials.
High-Res Audio Capability - Frequency Response to 40kHz: The extended frequency response of 21Hz to 40kHz, combined with 110dB SNR from both analog and digital inputs and THD below 0.01%, qualifies the P One MK2 for High-Resolution audio applications beyond conventional subwoofer use, including full-range monoblock amplifier applications.
110dB SNR from Both Analog and Digital Inputs: The P One MK2 delivers 110dB SNR (A-weighted) from both the RCA analog inputs and the optical digital input, confirming consistent high-resolution signal quality regardless of input source type.
Switchable Subsonic Filter at 21Hz - Butterworth 48dB/Oct: The switchable subsonic filter at 21Hz with Butterworth 48dB/Oct slope removes infrasonic content from the signal, protecting the subwoofer from mechanical overexcursion from subsonic energy without affecting audible bass frequencies.
Input Mode Switch for Signal Adaptation: The Input Mode switch adapts the amplifier to the specific characteristics of the connected input signal, optimising performance across different source types and signal levels.
Perfectly Combinable with Helix P Six DSP Ultimate: The P One MK2's optical SPDIF input is designed to directly accept the optical SPDIF output of the Helix P Six DSP Ultimate, enabling a complete Helix P Series system with fully digital signal transmission between the processor-amplifier and the subwoofer amplifier.
Regulated Power Supply with Start-Stop Capability: The regulated switching power supply maintains extremely stable output power during input voltage fluctuations and Start-Stop engine cranking events, with stable operation maintained during voltage drops to 6V for up to 5 seconds.
SMD Manufacturing Technology: Surface Mounted Device (SMD) manufacturing combines minimum space requirements with maximum component reliability for long-term performance in demanding vehicle environments.
What's in the Box
- Helix P One MK2 Amplifier
- Instruction Manual
Technical Specs
| Specification | Detail |
|---|---|
| SKU | P ONE MK2 |
| Brand | Helix |
| Range | P Series |
| Channels | 1 (Mono) |
| Amplifier Class | Class D |
| Built-in DSP | No |
| Power RMS at 4Ω | 1 x 500W |
| Power RMS at 2Ω | 1 x 880W |
| Power RMS at 1Ω | 1 x 1,500W |
| Max Output at 1Ω | Up to 1,800W RMS |
| THD | Less than 0.01% |
| Damping Factor | Greater than 450 |
| RCA Inputs | 2 x RCA (0.5-8V, 20kΩ) |
| High-Level Inputs | None |
| Digital Input | 1 x Optical SPDIF (28-96kHz) |
| Signal Converter | BurrBrown 32-Bit D/A |
| Outputs | 1 x Speaker |
| RCA Preout | None |
| Frequency Response | 21Hz-40,000Hz |
| SNR - Digital Input | 110dB (A-weighted) |
| SNR - Analog Input | 110dB (A-weighted) |
| Subsonic Filter | 21Hz, Butterworth 48dB/Oct (Switchable) |
| SPDIF Direct In | Yes (Switchable) |
| Input Mode Switch | Yes |
| Operating Voltage | 10.5-17V (Stable to 6V for 5 Seconds) |
| Power Rating | DC 12V, 160A Max |
| Idle Current | 1500mA |
| Fuse | 4 x 30A LP-Mini (APS) |
| Start-Stop Capable | Yes |
| Manufacturing | SMD Technology |
| Dimensions | 50mm x 260mm x 190mm |
Compatible With
The P One MK2 is compatible with 10.5-17V vehicle electrical systems. RCA inputs accept 0.5-8V from aftermarket head units and DSP processors. The optical SPDIF input (28-96kHz) is directly compatible with the optical SPDIF output of the Helix P Six DSP Ultimate and other compatible digital source units. The P One MK2 has no RCA preout and no high-level inputs. Confirm subwoofer impedance matches the 1Ω, 2Ω, or 4Ω rated output configurations before purchase.
Frequently Asked Questions
What subwoofer configurations is the P One MK2 suited to?
The P One MK2 is rated at 1500W RMS at 1Ω, making it ideal for 2 x 2Ω subwoofers connected in parallel, dual voice coil (DVC) subwoofers wired to 1Ω, or multiple subwoofers configured to a 1Ω combined load. It is also rated at 880W RMS at 2Ω and 500W RMS at 4Ω for single voice coil configurations.
What is the SPDIF Direct In switch on the P One MK2?
The SPDIF Direct In switch routes the optical digital input signal directly and losslessly to the amplifier's power stage, bypassing the analog signal conversion stages entirely. This enables a completely digital, ground-isolated, interference-free signal chain from the optical source to the speaker output, providing the purest possible signal path for the highest audio quality.
Can the P One MK2 be used as a full-range amplifier?
Yes. The P One MK2 has a frequency response of 21Hz to 40kHz with 110dB SNR and THD below 0.01%, placing it in High-Resolution audio territory. It is well suited for full-range monoblock amplifier applications where maximum signal quality is required, not just subwoofer applications.
Is the P One MK2 compatible with the Helix P Six DSP Ultimate?
Yes. The P One MK2's optical SPDIF input is designed to accept the optical SPDIF output of the Helix P Six DSP Ultimate, enabling a complete Helix P Series system with fully lossless digital signal transmission between the DSP amplifier and the subwoofer amplifier.
Does the P One MK2 include a built-in DSP?
No. The P One MK2 is a high-power mono amplifier without integrated DSP. For DSP processing, pair it with a compatible Helix or Match DSP amplifier or processor with an optical SPDIF output.
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