🔰 BEGINNER LEVEL: What SQ Judging Evaluates
Sound quality competition is the opposite of SPL: judges listen to your system and score it on accuracy and realism of music reproduction.
IASCA (International Auto Sound Challenge Association) scoring:
| Category | Points | What's judged |
|---|---|---|
| Imaging & Soundstage | 30 | Center image, stage width/height/depth |
| Tonal accuracy | 25 | Spectral balance, no coloration |
| Noise | 20 | Background noise, distortion, artifacts |
| Dynamics | 15 | Transient response, micro/macro dynamics |
| Installation | 10 | Visual quality, professionalism |
| Total | 100 |
Key difference from SPL: SQ systems play at 85–100 dB SPL typically — comfortable listening levels. Judges aren't impressed by volume; they're listening for how accurately a vocal sounds like the original recording.
What Wins SQ Competitions
Imaging (30 points — highest weight):
The stereo image should be: - Centered precisely on the dashboard, not left/right - Stable — doesn't shift as frequency changes - 3-dimensional — width, height, and depth perception - Layered — instruments at different perceived distances
This requires: - Excellent time alignment (within 0.1 ms) - Matched speaker pairs (left/right identical) - Proper phase relationships through crossover - Usually dashboard or A-pillar tweeter mounting for elevated image
Tonal accuracy (25 points):
Frequency response should be: - Flat ±3 dB from 40 Hz to 16 kHz - No peaks or dips that color specific instruments - Realistic timbre (violins sound like violins, not synthesizers)
This requires: - Quality speakers with flat native response - Measurement-driven EQ correction - Minimal room/cabin interaction
Low noise (20 points):
System should be dead silent with no music playing: - No alternator whine - No engine noise - No amplifier hiss - No turn-on/off pops
Background noise during music should be inaudible.