放(fang)大(da)(da)器(qi)(qi)(qi)的尺(chi)寸和形狀有(you)很多(duo)種,它(ta)們(men)的設(she)計用(yong)途是不計其數的,它(ta)們(men)基(ji)本(ben)上都是一(yi)樣(yang)的:它(ta)們(men)處理(li)聲(sheng)(sheng)(sheng)音信號,并通過揚聲(sheng)(sheng)(sheng)器(qi)(qi)(qi)使聲(sheng)(sheng)(sheng)音變得(de)更(geng)(geng)大(da)(da)。雖然大(da)(da)多(duo)數放(fang)大(da)(da)器(qi)(qi)(qi)都相當大(da)(da),以便(bian)(bian)(bian)(bian)處理(li)具有(you)大(da)(da)量功率和放(fang)大(da)(da)效(xiao)(xiao)果(guo)的聲(sheng)(sheng)(sheng)音,有(you)些(xie)放(fang)大(da)(da)器(qi)(qi)(qi)非常小且緊(jin)湊。小型(xing)放(fang)大(da)(da)器(qi)(qi)(qi)足夠小,既便(bian)(bian)(bian)(bian)于攜(xie)帶又緊(jin)湊,同(tong)時還允許在某些(xie)設(she)置下(xia)使用(yong)足夠的放(fang)大(da)(da)效(xiao)(xiao)果(guo)。微型(xing)放(fang)大(da)(da)器(qi)(qi)(qi)非常便(bian)(bian)(bian)(bian)攜(xie),并且可(ke)用(yong)于需要更(geng)(geng)安(an)靜的放(fang)大(da)(da)系統(tong)的場合。迷你(ni)放(fang)大(da)(da)器(qi)(qi)(qi)特別適用(yong)于吉(ji)他(ta)手尋(xun)找便(bian)(bian)(bian)(bian)攜(xie)式(shi)的聲(sheng)(sheng)(sheng)音選(xuan)項來(lai)練習。