Dating back to the 1950s, there has always been a desire for low-bass extension from a small enclosure. Back then, one of the best ways to achieve this output of sound was through the acoustic suspension design. This design principle turned KLH into a dominant solution in the loudspeaker industry for decades. The Model Five was then introduced in the mid-60s when high-fidelity was first becoming popular. The original Model Five was the perfect mix of size and performance and lead to un-heard of success in the speaker industry which is rarely experienced today.