Volume on my Pathos Classic One MKII ????

I just purchased a lightly used Pathos Classic One MKII. I have to turn it all the way to 80 or more to get a realistic listening level. That's really driving it to it's max which I believe is 100 on the volume readout. I use a pair of original Audio Physic Virgos with a Basis Signature 1400, Shelter 501 MKII and a Pro-Ject Tube Box.. It sounds like the speaker is really working hard here. Any insight or thoughts on this would be greatly appreciated.