This new exciting model is called the D20R and with the upgrades the sound quality has improved in all areas. Improvements comprise of a new cabinet with bass loading used in D30 and D40 models. A new crossover network and a ProAc ribbon tweeter as used in D30 D40 K6. The result is a wonderful open and expansive midrange with a substantial bass, ProAc ribbon tweeter giving sweet and detailed high frequencies, a large sound stage is also a bonus.