S

Sallen-Key filter — Ch 6.4
Sample rate — Ch 5.2, Ch 12.2
Scan-Speak — Appendix B
Sealed enclosures
  Alignments (Butterworth, etc.) — Ch 10.2
  Build example (complete) — Ch 10.2
  Design formulas — Ch 6.3, Ch 10.2
  Stuffing (polyfill) — Ch 10.2
Security systems — Ch 5.5
Sensitivity (speaker) — Ch 6.2, Ch 10.1
Series wiring
  Batteries — Ch 11.2
  Speakers — Ch 6.1
  Ultracapacitors — Ch 11.4
Service loop — Ch 8.1
Signal-to-noise ratio (SNR) — Ch 13.2
Single-DIN — Ch 5.1
Skar Audio — Appendix B
Skin effect — Ch 11.5
Slope (crossover) — See Crossover
Slot port — Ch 10.3
SNR — See Signal-to-noise ratio
Software tools — Appendix D
Sound deadening
  Application procedures — Ch 3.1
  CLD (constrained layer damping) — Ch 3.1
  Coverage vs effectiveness — Ch 3.1
  Products — Ch 3.1
Soundstage — Ch 13.2
Source — See Head unit
Spatial audio — Ch 14.1
Speaker
  Anatomy — Ch 9.3
  Blown diagnosis — Ch 7.4
  Full-range vs component — Ch 1.4
  Impedance wiring — Ch 6.1
  Installation — Ch 2.4
  Polarity testing — Ch 10.6
Spider (speaker suspension) — Ch 9.3
SPL (Sound Pressure Level)
  Addition (multiple sources) — Ch 6.2
  Competition — Ch 13.1
  Maximum from displacement — Ch 6.2, Ch 13.1
  Measurement — Ch 6.6
SQ (Sound Quality) competition — Ch 13.2
Stability (amplifier to load impedance) — Ch 8.3
Standards — Appendix E
Star ground — Ch 3.3, Ch 11.3
Star washer — Ch 2.2
Steering wheel controls (SWC) — Ch 3.4
Stiffness (suspension, Kms) — Ch 10.1
Stinger (accessories) — Appendix B
Streaming audio — Ch 5.2
Stuffing (polyfill) — Ch 10.2
Subwoofer
  Competition drivers — Ch 13.1, Appendix B
  Driver selection — Ch 10.1
  DVC wiring — Ch 9.2
  Enclosures — Ch 10.2, 10.3, 10.4
  Integration — Ch 10.6
  Localization — Ch 10.7
  Over-excursion — Ch 7.4, Ch 10.7
  Troubleshooting — Ch 10.7
Subsonic filter — Ch 10.3, Ch 10.6, Ch 12.3
Sundown Audio — Appendix B
Surround (speaker edge) — Ch 9.3
Suspension (vehicle, for heavy systems) — Ch 13.4
SWC — See Steering wheel controls