I would prefer to use the term 'accuracy' rather than musical. 'Musical' can mean anything depending on who you ask. Accuracy is how faithful the subwoofer stays to the source material, which would be what I consider musical since I would rather the system not add or subtract anything to the recording. We don't want our speakers to add overtones to instruments or to miss fundamentals.\n\nWhile I have heard the e112 and SB-13 Ultra, I don't have the extensive listening experience with them that I do with the ULS-15 mk2. However, extensive measurement sets exist for all three units (e112 reviewed here and SB-13 reviewed here). In terms of linear distortion, they can all achieve a flat frequency response and have good characteristics in the time domain. In terms of non-linear distortion, they all have very low harmonic distortion and noise products. However, the ULS-15 has a slightly wider dynamic range than the e112 or SB13. The e112 and SB13 have a nicer finish and more features, but with respect to performance they are not really more accurate. The premium that you pay for the e112 or SB13 isn't really going toward a higher quality sound, it is going toward a higher-grade finish and more bells and whistles.\nThat's exactly what I believe I have been hearing about the three of them, and since I do not need the higher-grade finish or any of the bells and whistles, I have been leaning towards multiple HSU ULS-15 MK2's. The only other option I feel worth investigating is that of the SVS PB16-ULTRA, however I very much fear going back to a Ported Subwoofer, even one as good as the SVS PB16-ULTRA. Throwing the SVS PB16-ULTRA into the mix, how do you feel it fairs compared to the other 3 Sealed subwoofers in terms of Musicality \/ Accuracy (for of course it plays much lower, as well as much louder in the lower octaves) ?