Problem: No Deep Bass / Sounds Thin

Symptoms: Music lacks impact, kick drums sound weak, bass guitar disappears on low notes

Step 1: Verify subsonic filter isn't set too high

If subsonic filter (HPF on subwoofer) is above 30 Hz, it's cutting actual musical content. - Fix: Lower subsonic to 20–25 Hz or disable if sealed enclosure.

Step 2: Check crossover frequency

If subwoofer LPF is below 60 Hz: - Musical bass content exists from 40–200 Hz - Crossing at 50 Hz creates a gap between subwoofer and mains - Fix: Raise LPF to 80 Hz

Step 3: Measure in-room response

Use REW. Measure at listening position. Look for: - Dip at 60–100 Hz: Polarity issue or crossover cancellation - Fix: Flip subwoofer polarity - Rolloff starting above 50 Hz: Box too small (sealed) or port tuned too high (ported) - Fix: Verify box volume matches design. For ported, verify port length. - Smooth response but level too low: Gain setting - Fix: Increase subwoofer amplifier gain 3 dB, re-evaluate

Step 4: Verify driver isn't damaged

Play 40 Hz test tone at moderate volume. Cone should move smoothly in and out with no scraping. - Scraping sound = voice coil rubbing, driver damaged - Cone moves freely = driver OK

If response measures flat to 30 Hz but still sounds thin: - Likely a levels/balance issue, not a frequency response problem - Bass may be present but not at appropriate level relative to midrange - Increase subwoofer level 2–3 dB