An 18ms delay indicates something is very wrong. I consistently get 0.00-0.04ms delays between main speakers when measured with my TacT equipment. The variation is due to slight changes in the placement of the microphone including being slightly off axis (not pointing 100% straight ahead).
Whenever I set up to do new measurements I always do a quick measurement first (3-4 pulses) and calculate a correction just to check the time delay between the left and right channels. If it is too far off I adjust the microphone by rotating it slightly in the proper direction.
If your speaker placement is symmetrical and the microphone is placed properly you should get zero or minor delay. Check all wires to make sure you have not reversed any connection. If that does not help manually change the delay to zero on the unit using the programming features on the remote.
Whenever I set up to do new measurements I always do a quick measurement first (3-4 pulses) and calculate a correction just to check the time delay between the left and right channels. If it is too far off I adjust the microphone by rotating it slightly in the proper direction.
If your speaker placement is symmetrical and the microphone is placed properly you should get zero or minor delay. Check all wires to make sure you have not reversed any connection. If that does not help manually change the delay to zero on the unit using the programming features on the remote.