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The Rolls Bellari PA550 is a preamp for phonographs and line-level sources as well as a headphone amplifier for your favorite pair of headphones. It sports two sets of RCA inputs and a 3.5mm input for computers smartphones and other appropriate sources. With the onboard switch you can choose among the inputs and route them to the RCA stereo outputs or the 3.5mm headphone out. Note that plugging into the headphone jack will mute the RCA output circuit leaving you with a dedicated headphone amplifier. A ground post is on the rear of the device for your turntable’s ground connection; this feature can help you minimize the noise commonly associated with ground loops. The PA550 features an equalizer based on the industry standard RIAA curve. With the bass and treble knobs you can tailor the lows and highs of the signal to better suit your preferences. A large volume knob is also on hand for adjusting the level of the output. A power supply is included.