PASS INT 3OA how loud does it play?

I bought Int 30A and it seems to me that there is something wrong with it . First of all when I crank it to max level it still can’t drive my 4ohm ML Spires (91 db) loud enough and max reading that I can get on display is 63. I would expect that the max reading should be 100. Second when I compare its max output to the output of my XA 30.5 I get LKFS reading of 0.4 for INT30A while I get 1.4 reading for XA30.5 for n the same input signal. I suppose I drive 30.5 with pre that has higher gain but still I would not expect such a big difference. Any ideas?
Thank you,
Check to see if you wired one of the speakers out of phase by mistake. That would cause low volume.

According to their web site Volume Control 63dB.
I had one driving my focal monitors (1007Be /89db per watt) for a short period of time and it got plenty loud enough. But I did feel it was a bit short on power as I was always running the volume control in the high 40's to low 50's and yes it tops out at 63. I don't necessarily listen at high levels and I was concerned I was running out of the Class A mode frequently; so I sent it back to Reno Hi-Fi.

Thank your for the comments guys. It works fine. I found the reason. I had a problem with the cables that I used to drive Int 30A.
Great that is a wonderful sounding unit.