🔧 INSTALLER LEVEL: Measurement-Based Integration

Using REW to Verify Integration

1. Measure front speakers alone (sub amp off)
2. Measure subwoofer alone (front amps off)
3. Overlay both measurements in REW
4. Identify the crossover region
5. Enable both — the combined measurement should show smooth handoff

What a good integration looks like: - Both individual measurements cross at the crossover frequency - Combined measurement shows ±1–2 dB variation through crossover region - No gap, no peak

What phase problems look like: - Individual measurements cross near 0 dB at crossover - Combined measurement shows a dip at crossover (cancellation) - Fix: flip polarity of subwoofer and re-measure

Fine-tuning time alignment:

The subwoofer's acoustic center (where the sound originates) is not at the driver face — it's effectively behind the driver by approximately one radius of the driver diameter. Add this to the physical distance measurement when calculating delay.

For a 12" subwoofer: acoustic center offset ≈ 6 inches.

If subwoofer is 64" from the listener and driver radius is 6", use 70" for delay calculation:

Delay = 70 / 13,500 = 5.2 ms