Day 6: Fine-Tuning by Ear

Test tracks used: - Diana Krall — "The Look of Love" (vocal imaging) - Steely Dan — "Aja" (bass definition and dynamics) - Patricia Barber — "Code Cool" (high-frequency extension)

Adjustments made:

1. Subwoofer level: Reduced by 1 dB (measured flat but sounded slightly heavy on Steely Dan)

2. Tweeter polarity: Tested both polarities. Normal polarity sounded more natural — confirmed correct.

3. Fine time alignment tweaks:

   • Left tweeter delay adjusted from 2.44 ms to 2.50 ms (+0.06 ms)
   • Resulted in better centered vocal image
   • Distance calculations are starting points — ears have final say

Final listening impressions:

• Vocals centered precisely between speakers
• Bass tight and controlled (no boom)
• High frequencies smooth and extended
• Soundstage width improved vs stock system
• Clear separation between instruments