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The THD+N of A30Pro is no higher than 0.00006%which means the A30Pro accurately restores 99.99994% of the original sound. A30Pro uses the new specifically redesigned NFCA based circuit is optimized for terrific single ended per formance. Massive paralleled high performance audio opamp architecture along with UHGF technology provides excellent DC and AC performance. Incredible output power: The new specifically redesigned NFCA based circuit is optimized for terrific single ended performance A30Pro provides 3 step gain settings which can easily adapt to the huge sensitivity span from IEMs to high im pedance and full size over-ears. Just connect the earphones and leave the rest to the A30Pro. The A30Pro already provides you all in a compact body including 4-PIN-XLR4 .4mm 6.35mm. Dimension:17.4cm*13.8cm*4.5cm br Weight:870g br Power:100-240VAC 50Hz/60Hz br Gain:L/M/H br Amplifier inputs: br 1*XLR L+R br 1*RCA L+R br Headphone Amplifier Out: br 1*6.35mm headphone output jack br 1*XLR headphone output jack br 1*4.4mm headphone output jack br Pass through outputs: br 1 x 6.35mm TRSL+R br 1 x – RCA L+R br Power consumption: 9.0W br br A30 pro Headphone Amplifier specifications br SE IN br THD+N @1k – Hz A-wt: br 0.00007% @Output=3.5W32 br 0.00006% @Output=90m – W300 br br THD @20-20k – Hz 90k – BW: br 0.00008% @Output=760m – W32 br 0.00007% @Output=81m – W300 br br SNR @MAX OUT 1k – Hz A-wt:145d – B br SNR @50m – V OUT 1kHz:104dB br Dynamic Range @1k – Hz A-wt:145d – B br Frequency Response:20Hz-40kHz0.05dB br Output Level: br 34Vpp @G=L br 34Vpp @G=M br 45Vpp @G=H br AP measured noise level @A-wt: br 0.7u – Vrms @G=L br 0.7u – Vrms @G=M br 1.2 u – Vrms @G=H br Actual noise level* @A-wt: br 0.3u – Vrms @G=L br 0.3u – Vrms @G=M br 0. 9u – Vrms @G=H br Channel Crosstalk @1kHz:-106dB br Input sensitivity: br 60Vrms @G=L br 12.6Vrms @G=M br 2.7Vrms @G=H br Gain: br -14d – B @G=L br 0d – B @G=M br 14d – B @G=H br Output Impedance: 0.10 br br BAL IN br THD+N @1k – Hz A-wt: br 0.00007 % @Output=3.2W32 br 0.00006% @Output=86m – W300 br THD @20-20k – Hz 90k – BW: br 0.00008% @Output=760m – W32 br 0.00007% @Output=81m – W300 br SNR @MAX OUT 1k – Hz A-wt:140d – B br SNR @50m – V OUT 1kHz:104dB br Dynamic Range @1k – Hz A-wt:140d – B br Frequency Response:20Hz-40kHz0.1dB br Output Level: br 6.6Vpp @G=L br 34Vpp @G=M br 45Vpp @G=H br AP measured noise level @A-wt: br 0.7u – Vrms @G=L br 0.7u – Vrms @G=M br 1.2 u – Vrms @G=H br Actual noise level* @A-wt: br 0.3u – Vrms @G=L br 0.3u – Vrms @G=L br 1.1u – Vrms @G=H br Channel Crosstalk @1kHz:-101dB br IMD CCIF @18k – Hz+ 19kHz:-116dB br IMD SMPTE @ 60Hz+7k – Hz: br -110d – B@SMPTE4: 1 br -116d – B@SMPTE1: 1 br Input sensitivity: br 12.7Vrms @G=L br 12.7Vrms @G=L br 2.7Vrms @G=H br