I had no issues with cutouts at all regardless of which device I attached the M15 to. ![]() I had run into some driver issues with the M12 and wondered if they would rear their head as well with the two designs sharing the same SOC but thankfully found that whatever issue had plagued WASAPI in Foobar had been cured. It is still not a feature you see very often and has led to comments online screaming about defective M12 and M15 models because end users don’t know about the feature.īe sure you have a headphone or earphone connected to the M15 when plugging the USB cable into the source. ![]() This design decision actually makes makes good sense since it can’t be used without a headphone connected and there is no point in draining power from the source unnecessarily. One quirk that must be highlighted is that a headphone or pair of earphones must be connected to the Questyle M15 before it is detected by the source device. ![]() The HEDD and HiFiMAN HE6 tax it heavily, but both can be used with the balanced output in a pinch although neither has a lot of extra headroom. With two gain options, the M15 offers enough power to drive full sized headphones like the Meze Audio LIRIC and delivers enough finesse to handle sensitive IEMs using the low gain mode and single ended output.ĭue to the use of the current mode amplifier, the measurements look a bit different than most I still had no trouble driving the Beyerdynamic (600 ohms) headphones or Fostex T50RP with its low sensitivity. The Questyle M15 is definitely not easy on your battery it drains less than the Xduoo Link 2 Balanced Dongle DAC and is roughly equal with the Cayin RU6 which offers some of the best performance I’ve heard to date from anything in the category. I found that the M15 cost me roughly an hour of battery life on my Samsung S21 or iPhone 13 when listening at normal volume levels for a period of 4 hours. The M15 adds a Torex power management system to allow the M15 to deliver maximum output power without draining the phone’s battery excessively. While most Dongle DAC manufacturers use the built-in amplifier for simplicity, the current mode amplifier Questyle designed has lower distortion and noise and offers greater bandwidth than similar voltage-mode amplifiers. Much like its less expensive sibling, the heart of the M15 is the ESS9281AC SOC, and like its little brother - the M15 uses current mode amplification and bypasses the built-in amplifier in favor of a current mode amplifier designed by Questyle. On the right hand side, we have a gain indicator with green for low and red for high on the left hand side we have the data indicator with green for 44.1/48kHz PCM, red for high sample rate PCM (88kHz to 384kHz) and DSD64/256, and magenta for MQA files. ![]() The LED indicators of the M12 are retained with one on either side of the USB port. Unlike the M12 with its automatic gain switching, the M15 gives the user a manual switch on the side eliminating one of the complaints leveled against the M12. The M15 uses a metal shell on three sides and a glass face so technology nerds have something to look at. The M15 is larger the the M12 but the weight difference is negligible and neither unit is difficult to travel with.
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