it looks like from XL up was redesigned and looks like
it was copied from sonic soundlabs co I seen thier website last year and
all of the subs has the same pattern with holes drilled in back and no vent?
I was a little sketchy on buying the product since I never seen
this done before butI I heard the subs at a show sounded good
but I could not find the website now.
I guess this must be a good design knowing DC was based on
RE subs look forward to getting my hands on XL or level 5 sub
later this year but no dealers in my area at this time