A quad shot, like the triple shot, is mainly used to keep the coffee to milk ratio the same in larger beverages.
Not used by all who need four espresso to balance out lattes in 20 ounce cups. Another way to deliver is to make 2 double espressos separately into the one cup with the same result. This is obviously more time consuming but may be all some barista’s have to work with. The quad derives from a 28 gram basket which needs a deeper group handle to fit into. It can yield an espresso to