Last week in a live show I had some guest singers join me on stage for additional harmony and I had maxed out my mic channels and could not add another microphone. I love my powered mixer and don't really want to replace it and most of the time it provides all the channels I need. But occasionally, I might run out of channels. I have a Y connector XLR cable that will allow me to plug two microphones into a single input, but then the volume and EQ cannot be adjusted independently.
I have a Mackie 808S powered mixer Mackie 808S running passive speakers with a non powered monitor output to which I connect a series of powered monitors as floor wedges. It has 8 channels with an XLR input and a line input on each channel. Two of the channels (7 and 8) have a left/right stereo input for keyboards or other stereo line level inputs.
I am wondering if I can use a non powered mixer such as the Behringer Xenyx Small Format Mixer (or any similar mixer) as a sub-mixer by connecting it to my powered mixer. I am just using this mixer as an example and not asking for opinions on the quality of that particular mixer.
My theory is that I could use 1/4 inch cables to connect the stereo main outputs from the non-powered mixer (or the control room out) into one of the two stereo inputs on my powered mixer. Then I am thinking I can plug additional microphones, guitars, pianos, electronic drums, etc. into the non powered mixer, and send the mixed signal from that mixer into channel 7 or 8 of my powered mixer which would then send the signal to the passive speakers.
In an ideal world, I would be able to apply effects from the non-powered mixer to the devices and instruments plugged into it, and turn the effects to zero on the powered mixer and thereby use a different effects set on the instruments and/or microphones plugged into the non powered mixer.
Is this feasible? Are there potential pitfalls? Will it cause any problems? And if it is feasible, should I use an instrument cable or speaker cable to connect the two mixers together?
EDIT: Could I send the main signal out through the "tape out" RCA jacks of the sub mixer into the tape input (RCA) of the powered mixer and send the monitor output from the sub mixer into channel 7 or 8 on the main mixer to preserve the ability to control the monitor feed from the sub mixer?