There isn't, but you are in luck if you're in the market

because I used a recently-made 610hlf on a gig last summer, and it's way closer in sound to the SVT 810e than the SVT 410hlf. I think what's going on there is that whereas the 410hlf is a big giant 410 with ports, the 610hlf has a smaller cubic volume per speaker than either the 810e or 410hlf, and the ports add in low end that it wouldn't have if it were sealed. I have no clue what the real cubic volumes are but it's pretty obvious that the 610hlf is narrower and shorter than the 810e.