The FiiO KA17 DAC features a special desktop mode that is activated when using the dedicated D.Mode switch. Engage the desktop mode, and the KA17 will automatically adjust the DAC, amplifier power supply, and amplifier power output to their full potential with enhanced power output. An innovative Desktop Mode is included, and features an external dedicated Type-C power port. With enough USB power, or when the independent power port is connected to a power adapter, the Desktop Mode will be enabled, and will automatically adjust the DAC, amp power, and headphone amplifier to a high-performance state, enabling the full potential and output power to come through. The KA17 is FIIO flagship mode, and the first USB dongle to incorporate the THX headphone amp circuit. It employs a brand-new THX AAA 78+ headphone amplifier architecture with a configuration of 4 channels fully balanced and 8 channels parallel-connected op-amps, greatly increasing the output power. Similar to a desktop amplifier, Desktop Mode allows the KA17 s balanced output power to reach up to 650mW + 650mW, offering greater dynamics, improved control, and full sound reproduction.