The SQ woofers are ideal for building ultimate sound quality full range systems. Featuring cast baskets and high end components and construction throughout these speakers would be many times the price in competitor brands. We don't charge for performance, so the value on offer here is staggering. Running from any source these are incredibly efficient speakers and have a musical quality that will startle you with its stereo imaging and beautiful open vocals. The speakers have a commanding midbass response and a very exciting, accurate and clear full range sound. The speakers play convincingly down to 60Hz if modest sound levels are required, and can be used without a subwoofer if so needed, still retaining impressive performance. They should be crossed over to a high frequency speaker by 6Khz if you are using them as a two way system.