Room correction altering soundstage

The Tact 2.0 is finicky to set up. Redo your initial audio test signals and see if you can replicate what you're now hearing.

Most people will tell you that a fraction of an inch difference in the distance from each speaker cam affect imaging. An 18 mS delay is equivalent to moving the speaker about 18 feet further away than the other one so yes, that would easily be audible. Can't you just turn off or adjust the delay and see what happens?

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I use a laser level on a good tripod to make sure my speakers are equidistant from the sweet spot. You should start the tact once the distances are precise.

I would try dialing out the delay if possible. That does seem like a lot.

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.