I compared the LFM-1 to an SVS 25-31PCi (the cylinder sub that is most closely related to the PB1-ISD - same driver and amp in different enclosures). I found that the LFM-1 blended better with my main speakers than the SVS did; there was a boominess to the SVS's bass that doesn't exist with the LFM-1. In the end, I preferred the LFM-1.

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