I use to set my (capable) speakers to large until I read the following and actually compared the sq difference:
There are three main reasons for avoiding the "large" setting.
The first is that crossovers aren't brick walls; they have slopes in both directions. The rule of thumb is that with typical bass management crossovers, your speaker should be flat to 1 octave below the crossover point. So, with an 80-Hz crossover point, your speaker should be flat to 40 Hz. Lots of speakers can do this. Only a few speakers are flat to 30 Hz (even though manufacturers' specs will try to tell you otherwise, there really are only a few, at least within a reasonable price range), and even fewer speakers are flat to 20 Hz (and below) at the levels a home theater will be asking for. The large setting on a receiver doesn't filter any low frequencies from a speaker to the sub. If the speaker isn't capable of the really low frequencies, they simply will be lost. Set to "small," however, these low frequencies will be filtered out and passed to the subwoofer, which is capable of reproducing them.
The second reason for using the "small" setting is that when you relieve a speaker of low bass duties, that speaker becomes a much easier load for your amp, and the midrange quality of the speaker often improves.
The third reason for using the "small" setting is that bass frequencies have the greatest interaction problems with a room. Multiple sources of low bass in non-optimal places cause all sorts of sound wave problems. The best place for your main speakers is almost never the best place from which to produce low bass. Being able to produce all the bass from one spot in the room gives you the best chance of optimizing your room's bass response.http://forum.ecoustics.com/bbs/messa...79/128214.html
With the NuForce AVP16, Emotiva XPA-5, and (Jim Holtz Design) Statement
speakers, IMO the sq is much better with a setting of small.
Bass gets redirected to a (15") Tempest-X fed by a Bash 500 in a 7 cu. ft. sealed box.