I have a older Yamaha EMX-660 Mono Powered Mixer with 6 channels, our band has expanded with vocals and percussion. To support the additional instruments I've added a 6 XLR input analog mixer (stereo) and send both output channels to the dual line inputs of one the powered mixer channels with the preamp section set to center. It seems to work OK, but I would like to simplify my setup by going to a single channel (8 XLR inputs) with internal digital reverb and send to three channels on the powered mixer (the main outs (R & L) and monitor out). The EMX-660 is 300w per channel and works great so I hate to replace it with a power amp at this time, but it is a hassle trying to control sound on two systems. I'm not technical enough to understand how the 6 channels on the EMX work and if sending a 16 channel signal into two channels would harm the power mixer. I'm thinking this would be OK and would basically just use the 3 channels set at neutral and the output volume and EQ. The powered mixer works great for small events but is limited for full band gigs. I'll appreciate any information or suggestions.
Analog Mixer I'm looking at: (8 XLR with 4 stereo line inputs) ()
EMX 660 manual: (https://usa.yamaha.com/files/download/other_assets/3/318553/EMX660E.pdf)