The tonal balance of the LS50s is affected by the height of the stands. Going higher than Kef’s recommended stand height of 24" (max.) will reduce the amount of bass due to less boundary (floor) reinforcement. I experimented with speaker height and found the most satisfying bass at 21" but the lower image height was an issue so I went with 24" (including spikes).
Buy a new listening chair if needed to get tweeters at ear level.
Buy a new listening chair if needed to get tweeters at ear level.