You need a sub. Or two. The QSC K-subs totally ROCK! Self-powered and easy to store and move size-wise. We use two of 'em for most shows. The JBL M-PRO 255S passive subs also TOTALLY ROCK!!! They are BIG (but so is the sound!) and need outboard amps but for large rooms or outside they absolutely rule. We use a pair of these at our church and I own a pair for FOH sound for bigger and outside gigs. They are very inexpensive on the used market right now as many are moving the powered subs like the QSC K-subs. About the best sounding and cost effective passive subs out there ah-yup!