Egnater "does" the perfect master volumes (IMHO).
I've never wanted or needed any attenuators or power-scaling in over 15 years of Egnater-equipped gigs - whisper-quiet background "jazz" to roaring outdoor fests.
I don't know what's going on in the topology, but the Master Volume on the tweaker is pretty impressive. Yes it sounds better turned up, but it certainly doesn't sound bad turned down.