Problem: Subwoofer Localizable (Can Tell Where It Is)

Symptom: Obvious that bass is coming from trunk/rear instead of blending with front stage

Causes and fixes:

1. Crossover too high (most common) - Humans localize frequencies above ~80 Hz - Subwoofer crossed at 100+ Hz is easily localizable - Fix: Lower LPF to 80 Hz or below

2. Subwoofer too loud - Excessive subwoofer level makes location obvious even if crossed correctly - Fix: Reduce sub level by 3 dB

3. Phase misalignment - Subwoofer arriving significantly delayed vs front stage - Fix: Add time delay to front speakers (0.5–2 ms typically) to align with subwoofer - Alternatively: Move subwoofer forward in vehicle

4. Polarity reversed - Rare but possible — certain frequencies reinforce from rear when polarity wrong - Fix: Test both polarities, choose the one where bass appears more forward

Verification test: - Play mono bass test track (bass in center channel) - Close eyes, point to where bass appears to originate - Should appear at or near dashboard, not trunk - If pointing backward = integration problem

END OF CHAPTER 10

Chapter 10 Statistics: - Word count: ~7,800 words - Page equivalent: ~16 pages - Sections: 6 of 6 complete ✅ - Three-tier structure throughout ✅ - Visual placeholders: 14 referenced