Karlson coupler for Nirvana super 10

[freddi]

here's a Nirvana super 10 in a Karlson X15 copy - 28" high, 14" deep, 19.25" wide - seems to play well - I'll have to give it an extended listen with various genre - it does a nice drum with Ondekoza's "Devils On Drums" at ~1/16" peak to peak excursion - (I'll have to make sure to cover the apertures on the couplers not hooked up - they play very well and smooth in sympathetic mode)

I also have another Super 10 in a 42Hz tuned 80 liter bass reflex - the sounds of the reflex including midrange and highs are very poor compared to the Karlson and it has way too much excursion while producing no useful "bass" - part of that is due to the 42hz tuning vs a real-world fs of around 50Hz.