@mlsstl - The room is large and a combination open kitchen/great room ( 23' X27' ) with 10 foot ceilings. The speakers are on the back wall and either side of a fire place, around 12' apart.
Listening volumes are somewhat low - jazz, R&B and female vocals. I get my volume on the Modwright up to 3-4 and its a normal listening level in this room. I will try an app on my phone - hadn't thought of that!
@sunshdw I should have mentioned that I am seriously considering the Volti Razz which I have heard and know will fit in. Another top candidate is the DeVore Gibbon Super Nines which I have also heard. I will hear the Spendor next week but not with an F8. All sound different than the Zu's and my gut tells me the Spendor may be the outlier due to the power on the F8. If so I will pass on taking the time to go listen. Hence wanting to get some thoughts here. Many thanks .....