is it safe to run more than one speaker off a channel on a mini system...got a jvc mini system has to channels, got it hookep up to my turntables...in one channel i have the normal speakers that come with it(4 inch mid woofer, tweeter...) and my sub from my car in the box(took it out for winter, figured i would use it...bad idea??) and in the other channel got the other normal speaker hooked up and a speaker box with a 8 inch woofer and 4 inch speaker and tweeter...is is alrite to do this?