This caught my eye.

It's a speaker project but with some advanced tweaks.
Not a home theatre application but rather an audiophile
app. for music rather than seat shaking.

The same builder also has designed a tube/gainclone hybrid
which is elsewhere at his site.

• Audiophile Sub

Did you see the JBL subwoofers mentioned a month or so ago? Seems like they were $300.00.

I dont expect much bass from that woofer however with its real low Qts,but the intention is quality,so it certainly would be 'tight' This seems to be the latest trend in the diy circles,ultra damped sealed boxes.