Advice on small room

Due to our living situation, I have use a 5' X 8' walk-in closet with a cathedral ceiling that is 7' at the apex for recording. Since this is a personal studio, and I record primarily myself on woodwinds (I play sax and clarinet) , what would be the best way to treat this space so a significant jump in quality is noticed? I am using Dynaudio BM6As, Akai DPS24 MKII, and various LDCs, and am generally pleased with the results, but would like to improve it if possible. Thanks, JFG3

Aloha and welcome to the forum, Perhaps a few of these wall units strategically placed? http://www.johnlsayers.com/HR/index1.htm Hope this helps, Aloha 8)