Seeing as how every other cardiod in the DPA line bottoms out at 40hz, I'd think that the freq. repsonse values might look more like 40hz-20khz for the musical response version.
Just me and voicing some guesstulations.
this is not true. the official published specs might say something like 40Hz-20kHz +/- 1dB (or whatever their tolerance is, I didn't check). but that's just because DPA advertises its mics as having a very flat repsonse. The mics will pick up sound below 40 Hz, but it slopes off a bit down there, so maybe the frequency response is -5dB at 20Hz. or maybe its -10dB at 20Hz. either way, DPA makes a
marketing decision to say 40Hz-20kHz +/- 1dB, rather than saying 20Hz-20kHz +/-10dB. because to DPA, its more important to show that the mics are very flat, rather than to show the lowest registers of the frequency response. other companies will publish specs that say 20Hz-20kHz, but then leave off a tolerance measurement. either way, the DPA standard and compact cardiods definitely go below 40Hz, they certainly don't just stop on a dime with nothing below that.