In-wall speakers ceiling mounted are a great alternative. The space behind in-wall speakers affect their performance, with .5 cubic feet being the lower limit.
Most ceilings face open attic space, providing easy installation and fewer acoustical problems.
You might consider two pair, with one pair at each end of your space, so you may enjoy comfortable listening levels without high sound pressure levels.
I choose B&W Signature 7 nautilus as my in-wall speaker. They are bi wire and bi amp, with great sound in a small package. There are plenty of other manufacturers with similar products, depending on what you like and want to invest in the project.
Most ceilings face open attic space, providing easy installation and fewer acoustical problems.
You might consider two pair, with one pair at each end of your space, so you may enjoy comfortable listening levels without high sound pressure levels.
I choose B&W Signature 7 nautilus as my in-wall speaker. They are bi wire and bi amp, with great sound in a small package. There are plenty of other manufacturers with similar products, depending on what you like and want to invest in the project.