Should I graduate to floor standers or will larger bookshelves suffice?

Are you using a subwoofer? Room correction? Are you using them all around or just in the front?

Looking at the Stereophile measurements, these don’t seem to be full range speakers at al, but close to the HT definition of a satellite. They are amplifier punishing below 150 Hz, along with a 100 Hz output peak and, while ported, the port adds very little to the overall output.

If you really like the sound quality, and are using some sort of EQ, either vai Roon or room correction, my suggestions would be:

• Plug the ports (increases dynamic range, reduces distortion at high output, reduces excess output slightly at 100 Hz)
• Add a subwoofer
• Hi pass the satellites ~ 80 Hz or higher (improves dynamic range, reduces amplifier strain, improves midrange resolution)
• Examine your amp to make sure it’s up to driving them
• Add room treatment to balance the mid/treble energy with the bass energy.
• EQ the bottom octaves of the Legacys to flatten it and make it more sub-friendly

Bookshelves+stands and floorstanders typically have the same footprint. When a dude's claiming he saved space, he did not ( it was just psychological for the dude). Unless you're stuck with nearfield listening distances (where drivers don't have room to sum) or budget constraints, don't bother with dinky lil bookshelves.

When a manufacturer offers both floorstanders and bookshelves, typically the engineer's maximum time and devotion goes to the floorstander (the bookshelf's the dinky lil afterthought). Always go with the floorstander when possible.

I never got the "logic" of using stand mounts when they take up the same floor space and are inferior to Floorstanders.

I also thought that it makes no sense to go with stand-mounted speakers that take the same floorspace as floor standing speakers.  But, there are many examples of stand mounted speakers that are really good and sound better than many comparably sized and priced floor standing speakers.  One should not automatically make assumptions based on general characteristics.

@secretguy:  Nah