ZYGI
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John,
It is just a difference in port tube length and passives, all new HDT's shipped from here are with the alternate tunning installed. Is it worth it, I say yes, many others, that bought the kit to change over there factory built speakers, say the same thing. If your not at the stage of having installed the ports, build it using 11" ports in place of the 6" ports and 17" ports in place of the 8" ports. You can order the passive from Decware, I believe the cost of them is $75 per the set of 4. If you choose to build, as per the plans you have, you can add the tube length to the ports with a coupler, cut out the old passives and glue in the new ones at a later date.
With the ALT. tunning the bass is deeper, and might just be a touch quicker sounding, which will make you think everyone that says, single driver speakers don't have any bass, don't know what they are talking about. Also with the ALT passives, since the passive are so close to the driver itself, there is a bit of midrange coming though the passives, not much, but if you get pretty close to a side wall, it could smear the mids, the ALT passives have a hard dome, which tends to diffuse the mids enough to make even close side wall reflections, from the passives, a non-issue.
BobZ
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