Frequency response is a tad tricky. If I say it's 20/20k that may be true, but to hear anything in the 20hz range, you might need the volume at max, and it may still be only 1% as loud as it should be. We're dealing with something analogue, so it's not can it or can it not, but variations and ranges of audio reproduction.
Something that markets itself as 40/15k may sound identical to something that markets itself as 2/40k because the extended range of the second is either badly or incorrectly reproduced, or so little volume it cannot be heard