Monoprice 615220 4-Channel Headphone Amplifier
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<b>[Product Information]</b><br>
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<li>35mm) amplified headphone outputs each with its own independent volume control</li>
<li>It features an extremely clean amplifier circuit which produces a signal-to-noise ratio greater than 98db</li>
<li>It accepts line-level audio input over the stereo RCA jacks on the back or headphone level through the optional 1/4 TRS jack</li>
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