does anyone use subwoofers in their setup?

[Jean-Marie]

A question on the subwoofer experts regarding properly setting up delay to ensure acoustical phase.

If my SW is located 11.4 feet closer to my listening position than the main speakers, then I will need to delay the output to the SW by 10.08 millisecs (11.4 feet divided by 1.13 feet per millisec) to correct the timing between the mains, sw, and listening position.  I will also need to subtract the processing time of the sw dsp (1.5 millisecs per manufacturer) from this amount to arrive at a revised total delay of the subwoofer preout by 8.58 millisecs.

Is my thinking correct?

Yes to my understanding.