Some bass players cannot use a bass combo amp, either due to strict noise and disturbance rules in their apartment, lack of space to store a combo amp (if they live in a small room) or due to the need for a set-up which can amplify multiple types of instruments and/or voice. Alternatives to buying a bass amp for people who have noise or space constraints include a headphone amplifier or a micro-practice amp which includes a headphone jack (on bass amps, connecting headphones to a headphone jack automatically turns off the main loudspeaker). Multi-instrumentalists and bassist-singers can consider a keyboard amplifier, a small PA system, or some models of acoustic instrument amplifiers which include bass as one of the instruments which can be used; all of these options have full-range speakers that can handle the bass range.