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Old 12th September 2020
Originally Posted by NathanEldred View Post
Whatever sounds good for your room should be used and there are no definitive rules; but to point a few things out:

80 Hz crossover is the standard for THX systems, and most people using systems for music set the subs differently. 50 Hz or so is still directional and is beneficial to hear from the stereo mains.

In general you want to set the subwoofer crossover to 1.5 octave above the -3db low point of the mains.

One subwoofer is generally not optimum, and can actually cause more problems in a room. Two subwoofers are usually better as they excite the bass peaks and dips less than one sub.
What is the rational of the last statement of using two subs rather then just one? Depends that also of phase and positioning of the sub or basically just because of the SPL potential?