p style="margin: 0px; text-align: justify;">Weight of the chestpeice is one of the factors that contributes to the superior sound quality that is heard when using this product. Size also contributes to sound quality. A wider diameter surface on a chestpiece will increase sound intensity over one that is small. A wide diameter surface area on a chestpiece may contribute to sound intensity, but may also result in outside noise getting into the system.</p