PreSonus ERIS E7 XT 2-Way Active Studio Monitor - 6.5"Special controls ensure the flattest response in your mix environment. The Presonus Eris 7XT is Eris Series 2 Way Active Studio Monitors with Wave Guide. Our best selling studio monitors just got even better. With their smooth, accurate frequency response; powerful amplification with tons of headroom; and acoustic tuning functions that ensure you always get the best sound it's no wonder that the original Eris series studio monitors have been a runaway