I thought I’d share this here. The writer goes through great length to explain the why’s and how’s of time alignment in a stereo system. He explains comb filtering, phase issues and alignment, crossover settings and so forth. Plus he does it in a manner that pretty much anyone with just a little bit of background or experience on the subject can understand.
http://www.audiofrog.com/community/tech-tips/time-alignment-part-one/
http://www.audiofrog.com/community/tech-tips/time-alignment-part-2/
http://www.audiofrog.com/community/tech-tips/time-alignment-part-three-delays-and-crossovers-for-tweeters-and-mids/
http://www.audiofrog.com/community/tech-tips/time-alignment-part-4-getting-the-bass-right/
http://www.audiofrog.com/community/tech-tips/time-alignment-part-5-putting-it-all-together/
Please forgive me if I’m wrong to link out to another manufacturer’s website forum. If so I will go through the trouble of copy/pasting the content.