I think need for use of damping materials will depend on the room and user preference. I have never used any nor been strongly tempted to.
Historically I've found wood or other lively floor materials to be the main issue in that the OHMs are bottom ported and a lot of energy is directed towards the floor.
"Remember: the "first reflection" point for an omni is not the same as for a conventional dynamic cabinet loudspeaker."
The first reflection point for an omni is variable depending on listening location I believe since you can listen from a wide range of lcoations and not just the "sweet spot". For the "sweet spot" the first reflection point on the rear wall would be the same as for other speakers in teh same location essentially I think. It would change depending on where you listen from. So it might become a difficult task to treat the room optimally in this way in a manner that works best for a wide range of listening locations.
I always view omnis like OHMs as best applied in scenarios where you want to use the room as it is as your concert venue as opposed to typical audiophile scenarios where you become obsessed with modifying the room to avoid interactions with the speakers.
Of course, some rooms can just make flat out lousy concert venues, so in these cases, you might want to think twice about using more omni designs like the OHMs.
Historically I've found wood or other lively floor materials to be the main issue in that the OHMs are bottom ported and a lot of energy is directed towards the floor.
"Remember: the "first reflection" point for an omni is not the same as for a conventional dynamic cabinet loudspeaker."
The first reflection point for an omni is variable depending on listening location I believe since you can listen from a wide range of lcoations and not just the "sweet spot". For the "sweet spot" the first reflection point on the rear wall would be the same as for other speakers in teh same location essentially I think. It would change depending on where you listen from. So it might become a difficult task to treat the room optimally in this way in a manner that works best for a wide range of listening locations.
I always view omnis like OHMs as best applied in scenarios where you want to use the room as it is as your concert venue as opposed to typical audiophile scenarios where you become obsessed with modifying the room to avoid interactions with the speakers.
Of course, some rooms can just make flat out lousy concert venues, so in these cases, you might want to think twice about using more omni designs like the OHMs.