Any spike protector discs will work as long as you keep the
speaker height similar to for the downward firing port. Different cones
will have slight sonic differences, but
relative to cost those differences are rather small.
If cost is less of an object, you may wish to try Finite Element Cerabases or Cerapucs which would not require
spikes, cones or protectors and still keep the speaker base height similar to stock and protect your flooring at the same time.
RFG
speaker height similar to for the downward firing port. Different cones
will have slight sonic differences, but
relative to cost those differences are rather small.
If cost is less of an object, you may wish to try Finite Element Cerabases or Cerapucs which would not require
spikes, cones or protectors and still keep the speaker base height similar to stock and protect your flooring at the same time.
RFG