Hi Ev,
two possible alternatives without buying extra gear are:
1- to use you hi-fi system, connecting the audio output of your mixer to the aux input of you pre-amplifier (with a dedicated cable)
2- to use your computer speaker system, via the audio input of your audio card (especially if you have one of those 5:1 systems with a good subwoofer... )
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Korg Kronos 61 and PA3X-Pro76, Roland G-70, BK7-m and Integra 7, Casio PX-5S, Fender Stratocaster with Fralin pickups, Fender Stratocaster with Kinman pickups, vintage Gibson SG standard.