Two of HELIX's flagship "Ultimate" tier DSP amplifiers, side by side. Both are premium, high-resolution DSP amplifiers built for serious sound quality builds — the difference comes down to channel count, input flexibility and how you want to structure your system. Specs below are pulled directly from Audiotec Fischer's own published data, not third-party retailer listings, so you can compare with confidence.
| HELIX P SIX DSP Ultimate | HELIX NEXT V EIGHT DSP Ultimate | |
|---|---|---|
| Channels | 6 | 8 |
| Power @ 4Ω (RMS) | 6 x 120W | 8 x 110W |
| Power @ 2Ω (RMS, select channels) | 4 x 230W (channels C–F) | 4 x 220W (channels 5–8) |
| DSP architecture | TwinDSP — 2 x 295 MHz processors, 64-bit, 12-channel DSP, 96 kHz sampling | Single 295 MHz processor, 64-bit, 14-channel DSP, 48 kHz sampling |
| High-level inputs | 6 | 12 |
| RCA inputs / outputs | 6 in / 4 out | 6 in / 6 out |
| Digital inputs | 1x Optical SPDIF, 1x Coaxial SPDIF | 1x Optical SPDIF, USB PerfectStream (192kHz/32-bit) |
| Frequency response | 10 Hz – 44,000 Hz | 15 Hz – 22,000 Hz |
| Signal-to-noise (analog) | 102 dB (A-weighted) | 102 dB |
| THD | < 0.004% | < 0.009% (1kHz, 1W/4Ω) |
| Operating voltage | 10.5 – 32V | 10.5 – 18V |
| Dimensions (H x W x D) | 50 x 260 x 190mm | 44 x 220 x 180mm |
| Price | $2,850 | $2,595 |
| Buy now | Buy now |
Which one should you choose?
Choose the P SIX DSP Ultimate if:
- You're running 6 channels or fewer and want the more powerful TwinDSP processing architecture for a competition-grade sound quality build.
- You want the widest voltage range (10.5–32V), useful for 24V commercial/heavy vehicle platforms as well as standard 12V cars.
- You want the wider frequency response and highest headroom for very demanding tuning.
Choose the NEXT V EIGHT DSP Ultimate if:
- You need 8 channels — for example, a full active front stage plus rear fill plus subwoofer, all off one amplifier.
- You want the most high-level inputs of any HELIX amp (12), making it ideal for complex OEM factory integrations with multiple speaker feeds.
- You want USB PerfectStream digital audio input directly from a laptop or source unit.
Full datasheets
For the complete official specification sheets, including detailed DSP routing diagrams and mounting dimensions:
- HELIX P SIX DSP Ultimate — full datasheet (PDF)
- HELIX NEXT V EIGHT DSP Ultimate — full datasheet (PDF)
Not sure which fits your build? Get in touch and tell us your channel count and vehicle — we'll help you land on the right amp.