In another forum I was working with an individual who is using the center channel for the acoustic timing reference. He was asked to measure the sub only for the left channel. He disconnected his left speaker and ran a full range sweep to 20khz. Surprisingly, the sub only sweep showed response to 20khz, but at a reduced level. I'm suspecting the timing reference was causing the center channel to respond. When acoustic timing was turned off, the same sweep showed just the noise floor out to 20khz for the sub only sweep.
The question is whether REW just sends a chirp to the acoustic timing reference channel or does it send other content?
The question is whether REW just sends a chirp to the acoustic timing reference channel or does it send other content?