The 15” digs down to about 23hz, while the 10” only gets to about 30hz, and that’s -6dB on the 10”. In addition, the level of output on the 15” is very respectable, I’ve measured around 112dB half space at 1m, at a distance of 9 feet, which is my listening position, I get 105dB from 25hz+. I listen to movies at about -15 to -10dB, and have a 1920 cubic ft room. if you like watching movies at a fairly high volume, you’re likely to reach the xmax limits of the 10”, especially in a room that size.
For music, a response down to 30hz is plenty adequate. That extra octave from the sub 1500 is noticeable though in movies. If you can afford two 15s or two 12s that’d be better.
Either way, I get decent results with a single 15 placed in an ideal location in an ideally shaped room. The 1500 packs enough punch to literally shake my sofa during movies, and offer a much more visceral, tactile experience. All of the subs sound surprisingly good with music as well, and measure reasonably flat.
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