I like the Siemens tube idea, but honestly don't think it will get you where you want to be. My guess is your room has a dropped ceiling 2 beds (possibly bunked), carpeted floors and possibly drapes. You have too much high frequency absorption relative to everything else. the midrange sounds okay in a small space because there is very little affecting it, but placement of the high frequency absorption could go a long way to getting better sound (realizing it's unlikely you can through your roommates' bed in the hall). Your speakers have more than 30 percent of their energy radiated from the back, so in your case, have a good hard surface behind them, this will accentuate the high frequencies and help balance the situation.