The Meridian and Equinox share the same baffle construction and both are medium to medium large chambers and have medium facing lengths. The piece has a nice centered focus and a quick response. It has the tight and refined resonance of the Equinox but in the extended range of the alto. The highs have edge but are not piercing, while the lows are remain robust but warm. The piece is even through the range. ,Phil-Tone mouthpieces are the labour of love. Each piece plays with ease and has texture and colours in the sound. There is an incredible range of sounds that you can achieve with these upper echelon mouthpieces.