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I think Amir did his best but the measurements don't reflect the bass behaviour. Those frequencies must be very hard to measure especially with multiple woofers and ports. I wonder why three 8'' woofers wouldn't give as much in the bass area as the two of the F226Be.
The most likely explanations IMHO (if not measurement error) would be all/any of the following:
- Those three 8" woofers of the F328 require a larger box than Revel was willing to put them in to extend lower than the two 6" woofers of the F226 in its not-much-smaller enclosure.
- Revel prioritised sensitivity over bass extension.
- Revel designers believe that a floorstanding speaker with a bass response that gently rolls off below ≈100Hz provides better overall performance in-room.
Regarding measurement error, I doubt the reality is significantly different from what we're seeing here. The Klippel should be reasonably accurate, particularly given the extra care taken in this case. According to Amir in the OP, the margin of error should be no greater than +/-1dB.
Having said that, I'm no expert on the Klippel.