just in case a wad of money fell on my lap
which would be a better setup in a 3500 cu.ft. room?
a Velodyne DD18 doing 50-80hz
and dual subwoofers (ported svs ultras) doing 10-50hz
OR
a Velodyne DD15 doing 50-80hz
and a Velodyne DD18 doing 15-50hz
EDIT: usage
is purely HT (in a dedicated room)
50-80hz sub will be nearfield
ported subs will have an SMS-1
pros and cons:
the first setup is a mix of ported and sealed subs - I don't know how that's gonna turn out
the ported subwoofers have 13.5" woofers which MIGHT not be recommended for 10hz tuning in a big room

which would be a better setup in a 3500 cu.ft. room?
a Velodyne DD18 doing 50-80hz
and dual subwoofers (ported svs ultras) doing 10-50hz
OR
a Velodyne DD15 doing 50-80hz
and a Velodyne DD18 doing 15-50hz
EDIT: usage
is purely HT (in a dedicated room)
50-80hz sub will be nearfield
ported subs will have an SMS-1
pros and cons:
the first setup is a mix of ported and sealed subs - I don't know how that's gonna turn out
the ported subwoofers have 13.5" woofers which MIGHT not be recommended for 10hz tuning in a big room