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The HELIX ISM 400.2DSP is a powerful 2-channel subwoofer amplifier module with an integrated 1-channel DSP. A compact and high-performance solution for modern subwoofer upgrades – it combines a powerful amplifier, signal processing, and a space-saving modular design.
The module is designed to be installed in place of the speaker terminal in Helix Impact pre-fabricated enclosures (MK2 revisions). By replacing the original terminal with the ISM 400.2DSP, a passive subwoofer becomes active – plus, you get a powerful DSP. Thanks to the SCP connection, it supports Helix wired level controllers.
The ISM 400.2DSP introduced the DeepImpact DSP algorithm, which dynamically restores the bass signal: it compensates for bass loss caused by high-pass filtering in factory systems and selectively emphasizes bass across signals in the entire frequency range. Thanks to its EV-Ready architecture, it is also suitable for hybrid and electric cars.
Also includes: ADEP.3, ACO, AISA, inputEQ, and Direct DSP.
Highlights:
- 2 x 200 W @ 2 Ω (2 x 130 W @ 4 Ω)
- Integrated 1-channel DSP, 64-bit / 295 MHz
- DeepImpact bass compensation algorithm
- RCA and speaker-level input, ACO automatic turn-on
- Smart Control Port (SCP) – supports Helix level controllers
- EV-Ready – suitable for hybrid and electric cars
- Can be installed in Helix Impact MK2 enclosures
| Power RMS @ 4 Ω | 2 x 130 W |
|---|---|
| Power RMS @ 2 Ω | 2 x 200 W |
| Max. power (10% THD+N) | 460 W @ 2 x 2 Ω |
| Amplifier class | Class HD |
| Inputs | 2 x RCA, 2 x speaker-level |
| RCA sensitivity | 0.4–4 V / 0.8–8 V |
| Speaker-level sensitivity | 1.6–16 V / 3.2–32 V |
| DSP resolution | 64 bit |
| DSP power | 295 MHz (1.2 billion MAC/s) |
| Sampling rate | 48 kHz |
| A/D converter | BurrBrown 32 bit |
| D/A converter | AKM 32 bit |
| S/N ratio | 102 dB |
| Distortion (THD @ 50 Hz, 1 W / 4 Ω) | 0.005 % |
| Operating voltage | 10.5–18 V |
| Fuse | 1 x 40 A LP-Mini (APS) |
| Dimensions (H x W x D) [mm] | 54 x 231 x 105 |
| Weight [kg] | 1.92 |
Compatibility (Helix Impact MK2):
- IK ES10.1-DVC2 MK2
- IK E8.1-DVC2 MK2
- Base for custom active subwoofer solutions