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The A30Pro’s THD+N is no higher than 0.00006% which means the A30Pro accurately restores 99.999994% of the original sound what you get is what you type. A30Pro uses the new NFCA based circuit specially redesigned and optimized for unique performance at one end. Massive parallel high-performance audio opamp architecture and UHGF Ultra High Gain Feedback technology provide excellent DC and AC performance. The drive capacity of the high output current allows the amp to easily drive low-impedance headphones. 4-pin XLR + 4.4mm + 6.35mm Output: Since then when buying a headset there is no need to worry about whether the plug fits the headphone amplifier as the A30 Pro already offers everything in a compact case including 4-pin – XLR 4.4mm 6.35mm. It is worth mentioning that the A30 Pro is designed with sufficient idle current. If the headphone impedance is more than 250 ohms it will work fully in class A. SE+BAL Input Pass-through: When shutdown the input signal is sent directly to Cinch or TRS without amplification. This is more suitable for active speakers / monitoring speakers if the DAC has preamp capabilities. Even better when used with the D30 Pro the D30 Pro’s excellent sound performance is not wasted. Satisfactory mid-range headphone amp superior specifications better sound and more refined construction. Maximize performance at one end. Using aluminum alloy shell made by machining center exquisite!