The impedance is very low, only 10 Ohm compared with the 32 Ohm of the Bose so they are very powerful and easy to be driven by the iPad/iPhone with quite low calibration values.
There is also a 100 Ohm version that is a little too much for the iPad/iPhone especially at low frequencies.
You can buy used ones on eBay for 70$-100$
For Telephonics TDH series spec follow the link.
http://www.schaffrath.net/tdhspecs.pdf
Calibration values are the following:
frequency: 125 250 500 750 1000 1500 2000 3000 4000 6000 8000
values: 99 81 57 50 48 46 54 51 57 52 74
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