The MPS1611P is a sweet-sounding speaker with an accurate, neutral character, and is claimed to have a similar tone to other M&K monitors. Transients are reproduced with crisp detail and natural dynamics, and with the port plug in place, the speaker delivers a smooth, well-balanced bass response that manages to deliver a surprising amount of information about low-frequency signals. With the cap removed, the character of the bass presentation changes noticeably, but it's still a well-behaved design overall. If the speaker was supplied only as a ported design it would receive rave reviews, but as a sealed cabinet design it gains a subtlety and smoothness in the bass region that really impresses. Personally, despite the lower maximum SPL, I preferred the sound with the plug in place.