Questyle MEX brings a physical EQ switch to a pocket DAC

A USB headphone dongle usually has one job and the social life of a paperclip. Questyle’s MEX has a little switch for deciding how much of an evening you’d like to spend adjusting your headphones. It’s a surprisingly sensible question to put on the hardware itself.

Japanese distributor Magway announced the MEX on October 29 and scheduled its first Japanese showing for November 7 at Tokyo’s Autumn Headphone Festival. The portable USB-C DAC and headphone amp was on the programme for listening sessions and an EQ workshop. Questyle’s own site still lists it as coming soon. The festival date gives us a look at the product, while retail timing and pricing remain open.

One switch, two ways to listen

PURE is the starting point for listening with Questyle’s own tuning. Flip to TUNE and the iOS or Android app offers presets and parametric EQ. The latter lets you pick a frequency, change its level and choose how wide a slice of the sound to adjust. If you like everything about a pair of earbuds except one little glare in the upper mids, that’s a more targeted tool than a bass or treble slider.

Here’s where the switch earns its keep. You can spend one session tweaking a curve and another just getting on with the album. The settings don’t have to become the main attraction, even if the graph has started to look like a very small mountain range you’re personally responsible for.

Check the plug and power before the format badges

Magway lists 3.5mm and 4.4mm headphone outputs, with the MEX drawing power from its USB host. It specifies support for up to 32-bit/384kHz PCM and native DSD256. Those figures describe accepted audio formats. For a purchase, the cable you own and the volume range you need are more immediate questions. A high sample rate isn’t going to untangle the wrong plug from the bottom of your bag.

For a phone setup, check what your device and cable support and how much hardware you want dangling from the port. At a desk, think about how often you actually switch headphones and whether a portable control would be easier to reach. Our audio comparison guide is a place to sort those priorities.

Keep an eye on what ships

Magway describes browser controls and shared tuning codes as planned additions, with timing to come. Treat them as possibilities when weighing up the MEX. The practical reason to watch it is the hardware switch and the promise of a useful EQ on a small wired setup. Follow our Audio desk for more on what reaches shops. The tiny mountain range can wait for a price tag.