如題,(||)發動機聲(sheng)(sheng)音并(bing)不(bu)悅耳,轉(zhuan)速高時聲(sheng)(sheng)音很嘈雜,怎么隔音效果好(hao)?或者能(neng)把(ba)聲(sheng)(sheng)音調(diao)得(de)厚重些?