: Manufacturers like Pirelli Design use premium designations for limited-run collaborations where material feel and high-speed safety are paramount.
| Feature | MP3 320kbps | FLAC (Lossless) | Standard Sone166 | | | :--- | :--- | :--- | :--- | :--- | | Average Bitrate | 320 CBR | 700-1000 VBR | 166 VBR | 240-320 VBR | | File Size (4 min song) | ~9.6 MB | ~30 MB | ~5 MB | ~8.5 MB | | Frequency Response | 20 kHz cutoff | 22.05 kHz | 18.5 kHz cutoff | 21.5 kHz cutoff | | Transient Preservation | Poor | Excellent | Fair | Very Good | | Computational Decode Cost | Low | Medium | Very Low | Low |
Use of reinforced composite housings to maintain optical alignment under thermal stress.