Listening to the M40s three feet away is stretching it. Not impossible but just not optimized. Large full range speakers perform best in mid or far-field configurations in large spaces.
In a 10'x 10' room, yes to the Compact 7ES-3, no to the SHL-5. You will need some treatments in that small room or the sound will be in a huge mess. If the P3ESR, one can probably get away with treating the room.
Placement is critical with the Harbeths as they usually sound best when placed away from wall boundaries. Close placement to walls will usually yield less than desirable effects unless one doesn't listen to music at high volume levels.
In a 10'x 10' room, yes to the Compact 7ES-3, no to the SHL-5. You will need some treatments in that small room or the sound will be in a huge mess. If the P3ESR, one can probably get away with treating the room.
Placement is critical with the Harbeths as they usually sound best when placed away from wall boundaries. Close placement to walls will usually yield less than desirable effects unless one doesn't listen to music at high volume levels.