Synergistic HFT’s with Martin Logan’s

I own Prodigys, with many HFTs applied.
Better sound, yes, expand sweet spot, NO,
since the HFTs can accentuate the 30 degree
curve of the panels, not work "against" it.
Maybe this is not an issue for you?

I would start with Wide Angle HFTs, I think these
offer the best sound and dollar value, in treating
your room.  The FEQ works well, too.

I mount HFTs on sea glass pieces before attaching
to stat panels, using blue stick.

You are on the right track, for sure!

@sgordon1 whats up with the sea glass ? 

Buy yourself a bag, online.  Use quarter size pieces,
quarter inch thickness is good.  Color and irregular
shapes are not important.  One side of the glass can
be smoother than the other.

Improves the effect of HFTs, IMHO, rather than just
sticking them on the stat panels...

  I have a total of 18 hft's in my room consisting of  wide angles, X , 2.0 and normal. Made a big difference in sound but as stated not the sweet spot.

  I also have the hft. There is new one out now 4 times stronger than the original.

  I haven't bought the hft's for the speakers. I am not sure if they work with Martin logans.