The SOLO 15 is a 5 speaker, tv-stand unit with great depth, clarity, and attempts surround sound. The SOLO 5 is listed at half the retail price and is essentially a large 2 speaker center speaker with poor sound that does not meet Bose standards by any means. Hope that clears any confusion! Read more.
https://www.amazon.com/Bose-Solo-15-Sound-System/dp/B012B7S46Q

