I half of my site dedicated to bitching about the problems with time alignment what it is imposable to do by pure real-estate efforts and a lack of clarity how it could be resolved properly. Sine this subject is the prominent for any horn user I decided to have a dedicated there where different time day methods might be under attention. Here is a brief summary of all know to me methods – I need you to invent better methods…

1) Pure analog Delay – work relatively OK narrow LF bandwidth and short delay time. To expensive and too sonically damaging for wide-range and for longer delay time. Implemented in a number of commercial speakers to fix baffle miss-alignment

2) Pure digital Delay - “clean” way to do it but it requires AD/DA processing – if you care. In case a playback uses ONLY digital sources then the delay memory might be implemented right in DAC level. This is a good solution (if you have only one CD player) but it unfortunately requires a crossovering at digital level…

3) FM analog Delay – modulation audio bandwidth into UHF, delaying in within classic analog delay lines and then demodulation it back to audio bandwidth. This is Dima’s “invention” and I feel that it is the most elegant idea among all. It is not implemented properly yet in order to validate it’s effectiveness.

4) Mechanical Delay – It is “kinky” way, I do not see a lot of people who have guts or stupidity to do it. Usually this type of delay implemented by old tape (or other) “echo” machines. I doubt that at relatively high level of playback demand the mechanical delay are implementable but it is an opportunity.