Most of the listening tests were done with a Hidizs AP80 Pro X. On the plus side, because of the high impedance, MACH 10 does not hiss even when you use a noisy source like Nintendo Switch. I'm not saying that you need a desktop-class amplifier, but you will need to turn the volume higher than usual. SENSITIVITY: 103dB IMPEDANCE: 80 Ohms having only one BA driver, MACH 10 is surprisingly hard to drive. DRIVERS: Single Balanced-Armature Driver Rating database and measurement database can be found on my IEM review blog. I use frequency response measurements to double check my subjective impressions. If a $1000 IEM scores the same as a $100 IEM, then either the more expensive one underperforms or the budget one is a gem. I rate IEMs by A/B tests them against a few benchmark IEMs, regardless of price point. IEMs achieving those criteria are rated highly in my ranking list I believe that great IEMs are the ones that can achieve multiple difficult things simultaneously: (1) high resolution (meaning lines of music are crisp, clear, easy to follow and full of texture), (2) 3D soundstage with a strong sense of depth, (3) bold and natural bass with physical rumble, (4) natural timbre, (5) relaxing and comfortable tonality. It has been delivered to the next reviewer in the tour. This review is based on a loaned unit from Westone via the MACH launch tour. Westone MACH 10 hits those points harder than many IEMs that I have auditioned for a while. Thus, a "good" IEM should be comfortable, isolating, and have a lot of clarity in the frequency band occupied by the wearer. In my mind, an IEM in its purest form is a tool for musicians to hear a mix on the stage whilst protecting their hearing.
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