FYI -
Sound & Vision reviewed this Sub as part of the JBL ES Series home theater speaker system in July 2008.
The ES250P Subwoofer's bass limits were measured with it set to maximum bandwidth (Crossover Bypass and Flat trim) and placed in the optimal corner of a 7,500-cubic-foot room. In a smaller room, users can expect 2 to 3 Hz deeper extension and up to 3 dB higher sound-pressure level (SPL.) The subwoofer's upper bandwidth was 103 Hz when its LFE input was used. With the internal crossover engaged, response only ranges from 52 to 81 Hz even though the crossover is marked from 50 to 150 Hz. There is also a 4-dB drop in level over the lower half of the crossover dial range, but no change in level over the upper half. To its credit, the ES250P can deliver 105 dB SPL (@ 2 meters) from 32 Hz upward.
How much are you thinking of spending on the HT Receiver?
The comparison linked above is certainly inconsistent with all the rest I've seen. Maybe auditioning a set or two simultaneously in your home (as long as return freight is free) would be the best bet anyway. It's really what you think is the best (sound & value wise) that counts.