So my first gut response would be to address your room itself and not the system components just yet. At 15' x 31' and a 14' ceiling height with little or no bass traps, no carpet or upholstery, no drapes, etc, this is going to be a challenge to say the least. If it were my project, I would work on the room first. I had a similar situation at home although not quite as extreme. First floor family room on a slab with thin carpeting to start. . I added upholstered furniture, a large thick drape covering the oversized sliding glass door and welcomed my wife to hang wet washed clothes on a portable rack instead of placing them in the dryer. Now I had a fighting chance. Over time, built my surround sound audio system with TWO powered B&W sub-woofers spaced strategically apart in the room, a new Rotel multi-channel amp (120 watts/channel/all channels driven into 8 ohms) and B&W/Monitor Audio speakers, Integra processor, NAD CD player. Fabulous performance.
So up front you may want to focus on buying two powered sub-woofers to overcome the reflective "live" environment in your large space and place them apart for more uniform room loading. You can stick with NAD, Denon, Marantz, etc for your components and then for loudspeakers, I would consider Monitor Audio and B&W. Just my input. All the best !!
So up front you may want to focus on buying two powered sub-woofers to overcome the reflective "live" environment in your large space and place them apart for more uniform room loading. You can stick with NAD, Denon, Marantz, etc for your components and then for loudspeakers, I would consider Monitor Audio and B&W. Just my input. All the best !!