I treat my room, with cheap panels of different materials, one at a time, with the ears open to listen the results... After a week of this process, the results were great indeed.... No more echoing dead sound, now clear bass, better musical rendering of timbre, better even at nearfield listening position...conclusion: no need to buy expansive products.... I dont need bass traps in corners at all...My room is a square 14 feets with 2 windows...i add a carpet,i treat the windows for vibrations,for the sound atmosphere i use some tourmaline crystals... Patience+experiments+2 ears do the job...