Most often the performance of a system in a given space isn't optimised due to room conditions. The performance of a system will be elevated to a much higher level in a good room coupled with proper setup, placement and acoustic treatments. Since most systems are often located in the living or lounge area and not in a dedicated room, one has to live with compromises(WAF) and accept any effects that the existing space may bring to the system.
As you have found out, even a minimal change in the addition of thick curtains is able to alter the sound to a significant degree. You can thus imagine how the system would sound like if more thought is given to improving room acoustics.
As you have found out, even a minimal change in the addition of thick curtains is able to alter the sound to a significant degree. You can thus imagine how the system would sound like if more thought is given to improving room acoustics.