Acoustic guitars are commonly constructed in several different body types. In general, the guitar's soundbox can be thought of as composed of two connected chambers: the upper bouts and lower bouts (a bout being the rounded corner of an instrument body), which meet at the waist, or the narrowest part of the body face near the soundhole. The proportion and overall size of these two parts helps determine the overall tonal balance and "native sound" of a particular body style – the larger the body, the louder the volume.