Other than that, all the drivers used in both systems are exactly the same and both system should be the same in terms of sonic performance with the exception of the bass which goes down to 29Hz instead of 31Hz on the Promedia 4.1s. Overall, the Promedia 2.1 system closely resembles the Klipsch Quintet microtheater system which was designed as a sat/sub combination for the upstream home theater market. The design of the satellites are very close to the Quintet system and the subwoofer carries on a similar design based on the bigger home Klipsch models. I really liked the sleek appearance of the system and I believe that they will look great in any setup.