I'm going to start producing music. First, I will need the equipment. I want to get some good speakers and possibly some studio monitors like these - KRK Systems RP5G2 Rokit G2 Powered Studio Monitor ... - but possibly cheaper. I will be producing mostly rap/hip-hop beats. My question is should I get a subwoofer? I've heard some speakers like these can be bright, and getting good lows is hard without a sub.