My big confusion though is what's the deal with the darn Fortec Mercury SPDIF output and the Extigy? Ie I have Fortec Lifetime and Ultra receivers, and the AC3 works fine through the Extigy, however the Fortec Mercury just does not work with the Extigy. It works fine with the Sonic Voom, however. If I look at the AC3 signal with a scope, comparing the Ultra to the Mercury, I see very little difference, maybe some small level shift, but nothing significant. And the NON-AC3 digital does work fine. There is something weird going on with the Mercury AC3 output. Fortec says that there is no processing and that there should be no difference.