One MAJOR drawback of the H660 (and the 650) is the front low/hi crossover, which can not be set lower than 200Hz, and the slope is fixed 12dB/oct. If you cross the underseats that high, you would probably want a steeper slope.
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Mobridge DA2 > JBL MS-8 > ARC XDi 600/4 > JBL Gti 408 Mids & Vifa OT19 Tweeters; PG Ti2 1600.5 > Morel HCW-10 & IDMax 15
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