I have been toying with the idea with billing a portable boombox incorporating a raspberry pi. If I put say two 4" full range speakers and a 6" sub (maybe smaller) in the same box am I asking for trouble mixing the frequencies? Also, my thought was to have the full range facing the front and the sub facing the rear of my box, so the magnets will be facing each other (not necessarily online though). Do I desperately need to physically separate the full range and sub from the same box? I was going to use a cheap crossover to separate frequencies.