I use a pair of box for 1 month with 2 speakers DLX 15,

I had this one before the series EVPX - 15 which I think is honestly one of the best value for money of the category,
the DLX series to talk about is more expensive but better, more power, more clarity in the high frequencies,
a weight heavy enough on the other hand and finish carpet may be a little fragile
they are more serious than the series EVPX.
For HK also has premium pro 15 and the Yamaha S-115V I would do the choosing DLX

because for me they have a clarity better than standard high frequency that the Yamaha is a bit messy,
and a dynamic and powerful than an HK which I find too much work in mediums
(Sound advice and personal taste)

for opening on one side, we see that there are a large filter and a good session of cable, it's nice!

I put 9 because the only problem is the weight a bit heavy and the finish carpet may be a little fragile.