Rarely do a company provide measurements but TFZ have frequency response graphs on their website. What they use to make them I have no idea, nor can I read the Chinese on the site but I can understand the graph at least. I screen grabbed it for you guys to have a look.
Of course I used my Vibro Veritas to make some measurements.
While they do show similar curves, especially to 2kHz, after that the Veritas as noted before shows less information of a similar trend. This shows a bass boost of just under 10dB as well as a boost towards 2kHz and again before 5kHz.