Fitness Studio Speaker System

[Abebee]

I looking for a speaker system and a headset for a fitness studio. Its one big open room a little less then 1500sqft with 12ft ceilings.

I need a system that's:

• Bluetooth so the instructors can easily pair their phones and use their playlists.
  
• Preferably a system that has ducking (music lowering when the instructor talks)
• A headset that is lightweight and wireless
• Preferably speakers that can hang from the walls/ceiling

So far from clicking around it looks like for a headset the Shure SM31FH is something that will work. Not sure if I need this This?

For the speakers, I've been recommended This one (dont think it has ducking) with this & this  I don't like that it doesn't have built in Bluetooth or ducking.

Was also recommend
this, this & 2 of these plus a mixer

Two of these are on the floor, and the third I think I would need 2 with a mixer.
As you can see I am confused not sure which direction to go, 1 speak, 2 speakers, floor, hang the speakers, do i need the more expensive headset?

If anyone can help me out I would greatly appreciate it.

Thank you,

[Yo ssi]

I'm a fan of the Evolve 30M or 50M that come with Bluetooth, it's a portable system though.