On the use of HSR as an upmix solution for stereo reproduction on multi-speaker systems
Multi-speaker systems demand upmixing solutions that spatialize sound while preserving tonal balance and artistic intent. HSR (High Space Resolution) meets this challenge by transforming stereo for setups with up to 64 speakers, without relying on FFT. Designed for post-production, live events, car audio and home theaters, HSR ensures natural immersion and faithful reproduction of the original mix. Unlike traditional FFT-based tools, HSR avoids phase artifacts and respects original dynamics. This presentation explores HSR's upmixing philosophy, compares it to stereo content processed through spatialization systems (e.g., IRCAM's Spat), and demonstrates how combining both approaches enhances stereo reproduction on multi-speaker systems — delivering precision, flexibility, and artistic integrity.
This presentation is part of IRCAM Forum Workshops Paris / Enghien-les-Bains March 2026