Denon leaves nothing to chance when designing their stereo amplifiers. The PMA-520AE may have a modest price, but it's full of advanced technology, such as gas-filled relays on the CD and phono inputs. All other components in the PMA-520AE are also top notch. The PMA-520AE is a broadband amplifier (up to 100kHz) with sufficient power to effortlessly control all kinds of speakers. In addition, the PMA-520AE even has a phono amplifier for MM elements, so you can directly connect a turntable.