Legacy Headset Benchmarking Methodology

How We Measure & Compare

We start with a brief look at the hardware used, and then proceed to a description of our measurements and measurement rooms:

Our custom-made chamber allows us to measure everything from graphics cards, loudspeakers, and headphones, to computer cases and fans. Its implementation is quite unusual: we built a room inside of a room. If you're imagining a large freight elevator, then you're on the right track. The cabin weighs just under four tons, is quite spacious, and torsionally rigid. It has a double-walled design and is filled with polyurethane foam. The only direct contact to the outside world is where it rests on dampeners. Since the doors are not quite as good as the other walls, despite their thick inner cladding, we built an additional frame on rollers filled with special foam that completely and hermetically seals the opening, shielding it from the outside world.

In addition, we lavishly clad this room in several layers. The bottom layer consists of a dense foam applied to the ceilings, walls, doors, and flooring. On top of that, we used a special pyramid-shaped foam on every surface except the floor. Down there, you'll find one layer of very soft grid plates, topped by a thick layer of felt.

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Another room right next to our measuring chamber allows us to control all of our tests externally. Thanks to a special cable duct in the measuring room, we have a wide range of connection options at our disposal. This includes a microphone cable, an additional stereo NF cable, speaker cable, HDMI and USB, as well as an optional 230V connection for active speaker systems.

Headphone And Headset Tests: What Is An Artificial Head?

Evaluating headphones and headsets requires a slightly more complex environment than loudspeakers. The positioning of the earpiece on the auricle, how well the pieces close around the ear, and the distance between sound source and microphone (and their directional characteristics) play a major role.

To get a reasonably reliable measurement is quite complicated. That's why, for stereo recordings, we use a homemade artificial head that imitates the properties of a human. Our microphones are placed inside the auricles.

More specifically, we're using two Shure Beta 181/C mics in a wax-like plastic cast head. Their linear frequency response is very convincing when recording indoor sound, even though these small microphones were originally intended for pure instrument recordings.

A particularly beneficial property is their distortion-free recording of high levels, which is just what we need for headsets. The necessary corrections are provided by a calibration profile that we prepared especially for this purpose.

We would like to point out that our measurements of loudspeakers, headphones, and headsets are, as a result of our technical capabilities, merely semi-professional.While the results are fully sufficient for an objective assessment of our test objects, they cannot match data generated by highly professional (and much more expensive) equipment that manufacturers and test laboratories use. However, as a general guideline, they should certainly be quite useful.

Music For Evaluating Frequency Ranges, Precision, And Spatial Representation

Instead of hi-fi jargon like thundering bass, delicate strings, and huge sound stage, we're focusing on a theoretical introduction to genre-relevant frequency ranges and the basics of spatial hearing.

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