The ‘desktop and portable dual power supply modes’as featured on the portable desktop-grade player FiiO M17 and the portabledesktop-grade amp Q7 have been well-received by the audiophile community, whichis why FiiO sought to put this technology on other products. Now, with theimplementation of the dual power supply modes onto the M15 with its moreergonomic design, the M15S is the ideal combination of portability and highperformance. Flagship-Level Tech - A New Chapter in the High-EndThe new M15S starts a new chapter in the FiO high-end, sharing the sametechnologies as the portable desktop-grade M17 player and the portabledesktop-grade amp Q7 that give you desktop-level performance in a portablepackage - including desktop mode, dual power supply modes, and five gainlevels. Dedicated Desktop ModeWhen in the dedicated desktop mode and under USB fast charging, the M15S willtransform essentially into a desktop device and work completely without the battery. That is, under this mode the battery will neither be charged nor discharged, preventing premature battery degradation. Robust Performance EverywhereThe M15S not only features the ‘desktop and portable dual power supplies’ asseen in other FiiO products but is also equipped with an automatic ‘auxiliaryDC power supply’. The M15S is able to automatically recognize when fastcharging through USB is being used, and automatically switches to use thehighest-voltage power supply, leading to an increase of 26.67 percent in powersupply for even more power output. Even when not using the fast-chargingadapter, the M15S can still automatically switch to a higher-voltage powersupply that is enough to drive most headphones. Near-Desktop PowerThe M15S can be adjusted with five levels of gain. Under battery power, low, medium, high, and over-ear headphone gain levels can be selected. When underUSB power, the enhanced over-ear headphone gain level is also available, enabling undistorted power output up to 1200 mW per channel, easily enough todrive a wide variety of IEMs and headphones. Six Operating Modes Including Roon ReadyFirstly, there is Pure Music mode, a FiiO-exclusive mode, for immersive music. Second is Android mode which freely uses third-party apps, including those ofstreaming services. Next is AirPlay mode wirelessly connect to iOS devices likeiPhone or iPad, with a sound quality boost. Fourth is Roon Ready mode which isRoon Ready certified, for serious music lovers. Fifth is USB DAC mode whichacts as a DAC when connected to a computer or phone, for greatly improvedsound. Finally, there is the Bluetooth Receiver mode that supports SBC, AAC, aptX, aptx HD, aptx LL, LDAC, and apt Adaptive, for convenient quality wirelesssound. Overbuilt Power Supply for Ample Clean Power AnytimeFully separated digital power supply, effectively reducing crosstalk, andinterference. Multi-stage analog power supply, high-precision, and low noisefor early signal processing. Multi-voltage servo power supply for headphoneamp, capably driving low and high-impedance loads. High-Performance ES9038PRO DAC Desktop-Grade PartThe full, uncut desktop ES9038PRO DAC chip with eight independent D and Aconverters is employed in the M15S. Each channel uses four D and A convertersin parallel to form a fully differential output, for a truly rich and highlyresolving sound. | Fiio M15S Portable High-Resolution Lossless Audio Player with Six Operating Modes and Qualcomm 660 | Financing Available