Bass players who do not have a combo amp who are playing live shows can connect their bass to a DI unit and from there to the PA system. In a well-equipped nightclub or music bar, the audio engineer can then route the bass signal to a stage monitor suitable for bass, so the bass player and band can hear the bass tone. Some standalone bass preamplifier pedals have a DI output, so this output can similarly be connected to a PA system. Bass players who are playing in small venues (coffeehouses, small pubs, etc.) will typically need to bring their own bass combo amp (or an alternative amp, such as a keyboard amp combo), because very small venues often have a very small, low-powered PA system which is used mainly for vocals. Some small venues do not have monitor speakers, or they have only one, in front of the lead vocalist. Bass players who do not have a combo amp who are laying down tracks in the recording studio can plug into a DI unit (any professional recording studio will have one), which is connected to the audio console; the audio engineer can provide the bassist with the sound of their instrument through headphones.