, ▁such ▁as ▁the ▁E min ence ▁E UB , ▁and ▁some ▁Alter E go , ▁A ria ▁and ▁Az ola ▁models . ▁While ▁these ▁small ▁reson ant ▁ch amb ers ▁are ▁usually ▁not ▁large ▁enough ▁to ▁provide ▁much ▁ac oust ic ▁ampl ification , ▁they ▁do ▁change ▁the ▁tone ▁and ▁response ▁of ▁the ▁instrument . ▁Cond enser ▁micro ph ones ▁can ▁be ▁used ▁to ▁ampl ify ▁E UB s ▁with ▁h ollow ▁bodies , ▁often ▁in ▁combination ▁with ▁other ▁types ▁of ▁pick ups . ▁ ▁E UB ▁players ▁who ▁use ▁the ▁bow ▁need ▁to ▁use ▁the ▁appropriate ▁pick up , ▁micro phone , ▁and ▁pre am pl ifier / equal izer ▁combination ▁to ▁avoid ▁the ▁t endency ▁for ▁the ▁ampl ified ▁tone ▁to ▁be ▁scratch y ▁and ▁high - s ounding . ▁To ▁obtain ▁a ▁more ▁natural ▁ar co ▁sound , ▁some ▁perform ers ▁use ▁a ▁cond enser ▁micro phone ▁for ▁ar co ▁pass ages . ▁Most ▁bass ▁pick ups ▁are ▁designed ▁to ▁capture ▁the ▁p izz ic ato ▁sounds ▁of ▁a ▁double ▁bass ▁rather ▁than ▁the ▁ar co ▁sounds . ▁Some ▁pick up ▁manufact ur ers ▁produce ▁pie zo elect ric ▁pick ups ▁that ▁pur port edly ▁provide ▁a ▁natural ▁reprodu ction ▁of ▁ar co ▁sound . ▁P ream pl ifiers ▁and ▁equal izers ▁for ▁ac oust ic ▁instruments ▁or ▁double ▁bass es ▁can ▁also ▁be ▁used ▁to ▁" roll ▁off " ▁the ▁tre ble ▁frequencies ▁or ▁" not ch ▁out " ▁the ▁" scr atch y - s ounding "