Car audio time alignment using REW?

[caseopia]

dear sir/madam,

How to make accurate time delay or time alignment using REW and UMIK-1 for car audio? Been searching whole time and cannot find step by step detail explanation. Thank you if admin can provide me step by step detail about time delay or alignment for car audio purpose using REW and UMIK-1

 

[John Mulcahy]

Using the acoustic timing reference in a car can be problematic as there are many strong, close reflections which can affect the determination of the reference time. The timing reference output should go to the tweeter (it is a 5 kHz to 20 kHz sweep).

 

[caseopia]

So it means use sweep for tweeter unit (example since driver pos Right,then if i use right tweeter as timing reference) what next?Right midrange? or subwoofer at trunk?
Since in my car left midwoofer is the farthest driver unit (0 ms delay) for sure.