The amp is two channel, means you can only connect two speakers unless you use a distributor to split the signal. Type of speaker you will use depends on what use you are using them for. A 220 watt amp is plenty to power 8 split speakers (well 16 really) just not very high end ones that draw a lot of power. https
/www.amazon.com/OSD-Audio-ISS8-8-Channel-Protection/dp/B001YIPCJQ