The reason for the delay is that you want the out-of-phase right channel signal injected into the left channel to arrive at the left ear at the same time as the (in phase) acoustic right channel signal arrives at the left ear, resulting in cancellation of the right channel at the left ear. Similar logic applies to the out-of-phase left channel signal injected into the right channel. In other words we want the left ear to hear only the left speaker and the right ear to hear only the right speaker.
There are always side effects. Mixing the delayed out-of-phase signals cross channel results in some comb filtering, which explains the phasey sound noted by some listeners.
The effect is record-able, and the c9 had a sticker on the back warning the user that it was illegal under the Sonic Hologram license to use the device to make recordings.
That Ambiophonic device looks interesting.
There are always side effects. Mixing the delayed out-of-phase signals cross channel results in some comb filtering, which explains the phasey sound noted by some listeners.
The effect is record-able, and the c9 had a sticker on the back warning the user that it was illegal under the Sonic Hologram license to use the device to make recordings.
That Ambiophonic device looks interesting.