This is the cheapest of the pre-calibrated headphone configured in Audiogram Mobile.
You can buy it at Amazon at only 25$ / 20€.
http://amzn.com/B0007XJSQC.
Calibration values are the following:
frequency: 125 250 500 750 1000 1500 2000 3000 4000 6000 8000
values: 79 66 72 82 78 73 85 85 73 72 93
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