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Inputs to the Q Acoustics M40 can be Bluetooth (all of aptX, aptX HD (offering 24-bit, 48kHz), aptX Low Latency, SBC, AAC), Optical S/PDIF and USB B from a laptop or other (both processing up to 24-bit, 192kHz), handily there is a 3.5mm Aux input as well at the rear for other portable devices. There is a single pair of RCA inputs for analogue sources, such as a turntable, streamer etc.