Hi all-
Jamie from Grace Design here. I just received an email from Jim, which drew our attention to the thread. Sorry there has been so much confusion regarding this.
The digital outputs (AES1, AES2, S/PDIF and TOSLINK) are 180 degrees out of phase. As you know absolute polarity does not have an affect on the sound when the relative polarity between the channels is consistent. It does however become an issue if you are summing multiple sources that have inverted polarities, which is the case here. With the V3 digital outputs 180 degrees out of phase from the analog inputs on the 744, the low frequency response will be compromised if these signals are summed.
The fact that the V3's digital outputs are 180 degrees out of phase was only recently discovered when both the analog and digital outs were recorded simultaneously to a workstation. Upon discovery we immediately corrected this issue in new production units. Beginning with serial number V3497, all of the digital outputs are in phase with the input. Any unit prior to this serial number will have inverted polarity on the digital outputs.
Again, when recording two channel audio this is not a problem, but for multichannel or matrix recordings that use the digital outputs, this should be corrected. Obviously we are here for any of you who want/need to have the digital output in phase with the input and will provide this service at no charge under warranty. To arrange for this service, please contact me at jamie@gracedesign.com.
Once again our apologies for the confusion and any trouble this may have caused.
Best regards from snowy Boulder, CO
- jamie