The boomy bass that most audiophiles hear is due to resonance of the walls, not the corner position of the subwoofers. The corner position of the subwoofer intensifies the bass by acting as a megaphone which also can intensify the boomy resonance. This wall distortion can be neutralized with proper wall treatment (resonant sound channels, a double layer of half inch drywall: one gray, one green board, and with ACS sound absorbing squares sandwiched between the two boards). As mentioned by Ekovalsky, a digital sound processor will also work well.
All of my speakers (a pair of Klipschorns and a pair of TacT W410 subwoofers) are designed to fit into corners. With the Marchand XM6 crossover set at 35Hz, the two pairs of speakers are flat from 12Hz to 12000Hz. This is possible only with wall treatment and tweaking the metal horns in the Khorn.
It is true that placing the subwoofers in the center or sides of the room will make the bass "smooth". But then a "smooth" sound is soft and quiet which defeats the purpose of a subwoofer.
All of my speakers (a pair of Klipschorns and a pair of TacT W410 subwoofers) are designed to fit into corners. With the Marchand XM6 crossover set at 35Hz, the two pairs of speakers are flat from 12Hz to 12000Hz. This is possible only with wall treatment and tweaking the metal horns in the Khorn.
It is true that placing the subwoofers in the center or sides of the room will make the bass "smooth". But then a "smooth" sound is soft and quiet which defeats the purpose of a subwoofer.