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I picked up a set of the SB15CRC30-4 carbon fiber / rohacell SB15 woofers from Madisound's black friday sale, and I'm trying to decide what size of enclosure I should use for them. I'm conflicted because SB acoustics published T/S parameters say the Fs in 37Hz and the Vas is 17.3L. I trust them to put out good parameters, but they measure their specs differently than I do via DATS or SoundEasy. I did measure after a 30hz break-in tone with output level just below where the woofers started to complain too much.
Using SB's parameters, a vented 9L box tuned to 48Hz looks quite flat with plenty of extension for desktop monitor use. However, if I model the same box with the T/S parameters I measured from my two woofers, I end up with a bass hump of +1.7 or +2.2 dB around 100 Hz. I like what I see with SB's parameters, but if that isn't real... then bass box is suggesting a much bigger box (~20L) to give flat performance.
DATS T/S parameters with impedance sweeps, and bassbox model screenshot for my two woofers are attached.
Thoughts? Do I trust SB and roll forward or stay true to the measurements I have in hand and replan?