This is a specially designed Slim series speaker of ours. It is well known that a thinner speaker basket will result in insufficient Loud-Speaker Throw, leading to poor bass performance. However, if someone wants a smaller space but still wants relatively good bass effect, then changing the material of the speaker edge is a good option. This FE-MBSL80 model uses none-pressed paper with rubber edge,With the effect of the rubber edge, the X-max of this speaker will be larger, compensating for the insufficient Throw caused by the "slim" design. While maintaining its original mid-range effect, it will make the drumbeats of the music more rhythmic. The 2-inch voice coil design further ensures its loudness. This slim mid-low frequency speaker can reach a minimum frequency of 56 Hz. It is a special version worth trying.