The new WaveCave Royale from Auralex has made a huge difference in the clarity of the music in my listening room. Now I can understand almost every word in the lyrics. The harshness with some songs is gone, and so I can turn up the music a few decibels to the point that it comes alive without fatigue. Sibilance in vocals sounds more natural, too. I feel like I just got new audio equipment, like a more expensive DAC. I expected a more modest change, but what I am hearing is a substantial improvement. All this from using just four of the 12-inch by 24-inch WaveCave Royale foam panels behind my speakers.