Time Alignment Workflow
Project And Measurement Record
Vehicle / project
Date
Technician
Preset / configuration
Measurement software / version
Microphone / calibration file
Sample rate
Ambient temperature
Microphone reference position
Seating goal
Timing-reference method
Reference channel / speaker
Choose The Alignment Job
- Left-right stereo image
- Tweeter-to-midrange crossover
- Midrange-to-midbass crossover
- Midbass-to-subwoofer integration
- Driver-seat priority
- Front-row compromise
- Whole-vehicle coverage
Safety And Baseline
- Gain structure verified and safe sweep level chosen
- Protective crossovers active
- Tweeters / compression drivers protected
- Channel routing and mute state verified
- Initial polarity states documented
- Initial delay states documented
- Microphone and timing reference remain fixed
- Baseline preset saved
Driver And Channel Measurement Table
| Channel / driver | Physical distance | Starting delay | Polarity | HPF / LPF | Level | Trace name |
|---|---|---|---|---|---|---|
Starting delay (ms) ≈ path difference (inches) / 13.5
Starting delay (ms) = path difference (metres) / 343 × 1000Stereo-Image Alignment
- Left and right level / response compared first
- Source balance and routing verified
- Starting delay applied to earlier side
- Timing-reference traces captured
- Centered mono vocal / speech checked
- Delay and level changes recorded separately
| Test | Left | Right | Result / action |
|---|---|---|---|
| Arrival / timing marker | |||
| Level in image band | |||
| Starting delay | |||
| Final delay |
Adjacent-Driver Crossover Verification
Lower-frequency driver
Higher-frequency driver
Target crossover
Microphone position
- Both individual responses measured with same timing reference
- Measured acoustic slopes inspected
- Relative phase inspected through overlap
- Intended-polarity sum measured
- Reverse-polarity sum measured
- Nearby position / angle checked
| Iteration | Delay | Level | Polarity | Filters / EQ | Normal sum | Reverse null |
|---|---|---|---|---|---|---|
| Baseline | ||||||
| 1 | ||||||
| 2 | ||||||
| Final |
Subwoofer Integration
Subwoofer channel / enclosure
Adjacent band
Overlap range
Polarity states tested
- Subwoofer and adjacent band measured separately
- Relative phase checked through overlap
- Delay sweep or structured delay iterations completed
- Nearby microphone positions checked
- Localization, impact, decay, and tonal continuity checked
| Delay | Polarity | Sum through overlap | Nearby-position result | Listening note |
|---|---|---|---|---|
| Final |
Final Verification
- Timing reference remained consistent
- Magnitude, phase, impulse, and crossover sums saved
- Group-delay features checked in context
- Driver-seat / passenger / nearby-position compromise documented
- Final preset saved and backed up
- Representative music checked at safe level
- No driver distress, mechanical noise, or protect behavior