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Room treatment is paramount to good sound with any system. That's a fact. But often, the stuff costs as much as the electronics you're using. That's what makes these simple, foam designs from Auralex so appealing. They work and they're reasonable.
The 2" Studiofoam Wedges are Auralex's most popular seller. Use 'em to treat small to medium-sized areas. They effectively kill standing waves and flutter echoes and, when used in conjunction with the LENRD Bass Traps, they can effectively tame the full frequency bandwidth in virtually any room. This is your safest bet if you're tuning your room yourself without the help of a professional acoustician.