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Paul: The X-max is 13mm one way, but the efficiency and overall displacement is what makes this such a good sub IMO, also very hard to bottom out with a clean signal. The ports had chuffing at Fb with sine waves, although it might not be a problem with actual content I wanted to be sure so I...

Thanks for the compliment. The vent is 8" by 30 something (can't remember) but the tuning is right at 18Hz, and there is no way to make this thing chuff. I spent many hours and built 4 prototypes and many different vents to get a combination that would not have port noise, as port noise is...

I guess mine is a bit unusual, so I’ll post a link for my web site, unfortunately the pictures aren’t that good and I don’t have any web pics of the port valve mechanism or how it works so it’s hard to get an idea of what’s going on with the Jetsons looking architecture. Most hear have...