Perhaps consider getting a preamp with HT bypass capability.
This allows a fairly "straight wire" unity gain path through the preamp for HT, but provides the purity of 2-ch playback you want for non-HT sources because the pre/pro isn't in the signal path.
Are you using the Anthem's analog direct mode for your 2-ch sources?
This allows a fairly "straight wire" unity gain path through the preamp for HT, but provides the purity of 2-ch playback you want for non-HT sources because the pre/pro isn't in the signal path.
Are you using the Anthem's analog direct mode for your 2-ch sources?