Guy, no change in the crossover to the M22s needed, but do pay some attention to the Trim control. Contrary to what some imagine, the smaller the room the bigger the boost it gives to the very low bass frequencies. The Trim control tries to establish a better overall bass balance in less than very large rooms by boosting the mid-bass frequencies to compensate for room gain at very low frequencies. You may well find that the bass is less boomy with Trim at Half or even Full.

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Enjoy the music, not the equipment.