Over the years, I have posted several questions about possible things I might be able to do to improve my sound quality. Some questions were about speakers, some about amps, and so on. On almost every thread, advice was strongly given to treat the room. Well, the other day, I put about a 4' by 4' section of insulation on the right wall in my bedroom system, at the first reflection point. This fairly well sucked the life out of the sound. This is not to advocate against room treatments, and I think a smaller panel might be the ticket. But, apparently, it is very easy to do too much treatment.
Now, I would also recommend trying different speaker cables. The biggest recent improvement I have made in the aforementioned bedroom system(Monitor Audio Silver 9i speakers) was going to a set of Goertz MI-2 speaker cables(I had tried them years before in a different system and were in storage). Before that, I had been using some Morrow SP2 cables which I thought were pretty good on the highs, but I wasn't getting much bass out of the speakers. With the MI-2, however, I now have much more and better bass, great attack on transients, and really clear dialog on movies and vocals. YRMV, of course.
Now, I would also recommend trying different speaker cables. The biggest recent improvement I have made in the aforementioned bedroom system(Monitor Audio Silver 9i speakers) was going to a set of Goertz MI-2 speaker cables(I had tried them years before in a different system and were in storage). Before that, I had been using some Morrow SP2 cables which I thought were pretty good on the highs, but I wasn't getting much bass out of the speakers. With the MI-2, however, I now have much more and better bass, great attack on transients, and really clear dialog on movies and vocals. YRMV, of course.