The R-41PM monitors incorporate individual ultra-low noise amplifiers custom designed to maximise system performance and eliminate the need for external amplification. So you can avoid the expense, clutter and hassle of an external AV receiver. At less than 10" tall, these powered speaker deliver room-filling sound and incredible acoustics without needing much space. With an integrated phono pre-amp, Bluetooth wireless technology, digital optical, analog RCA and USB inputs, your R-41PM is the best performing, most versatile monitor on the planet designed for effortless integration with turntable, TV, PC or wireless device. The full featured IR remote allows easy access to system features like dedicated source selection, track controls, and play/pause. To expand your system, simply add a subwoofer for even more bass. Dynamic volume is a first for Klipsch powered monitors. What you get is powerful bass whether the listening volume is low, cranked up or somewhere in between.