Another challenge with designing sound systems for live music clubs is that the sound system may need to be used for both prerecorded music played by DJs and live music. If the sound system is optimized for prerecorded DJ music, then it will not provide the appropriate sound qualities (or mixing equipment and monitoring equipment) needed for live music, and vice versa. A club system designed for DJs needs a DJ mixer and space for record players. Clubs tend to focus on either live music or DJ shows. However, clubs which feature both types of shows may face challenges providing the desired equipment and set-up for both uses. In contrast, a live music club needs a mixing board designed for live sound, an onstage monitor system, and a multicore "snake" cable running from the stage to the mixer. Lastly, live music clubs can be a hostile environment for sound gear, in that the air may be hot, humid, and smoky; in some clubs, keeping racks of power amplifiers cool may be a challenge. Often an air conditioned room just for the amplifiers is utilised.