Subbass psychoacoustics: pitch perception?

I had recently a weird experience. A friend was testing a CKRAM (30hz tuned reflex, b&c 21DS115 loaded) outdoors.

Coverage and loudness was ok, but i felt the sound was a bit one notish, and i couldnt really make out the melody of the bass line in some songs. The source material was unfamiliar to me, so i put it down to bad production.

Incidentally, I shot a few bits of video with my phone to share and have as a memory. Listening back to those videos later, i noticed that I could clearly make out the melody of the bass line, that i had been unable to perceive when I was actually there!!!

Does anyone have similar experiences? Or a possible explanation for this phenomenon?

At home i have a dipole open baffle arrangement with two 12" woofers, that provides excellent tonal/pitch distinction, and strong output down to 30 hz. 

I listened back on standard Samsung earbuds, which admittedly don't have very strong low bass response, but with my beyerdynamic DT 770 pro I can tell there is definitely some content in the 40- 60 Hz range. I uploaded the video to youtube: 

As I said, I don't think this is an issue of distortion. What kind of psychoacoustic/auditory process could be going on here? There is the age old purported topic and phenomenon of "one note bass", which is sometimes attributed to bass reflex speakers.  

Clearly, I need to do some more field recordings with more appropriate gear at the next opportunity.

at the time that video was shot, I just dropped in rather late to catch up with my mates  

edit: listening back on my macbook speakers, there is not even a hint of the bass line, so again, I very much doubt that any recording and/or playback distortion is going on.....

You would have to play the cabinet without any means of a HPF,  LPF, in addition to, equalization to confirm the signal processing is not creating any severe phase issues. Phase issues can cause a sound to emit a peculiar sound from the original program material. Traditional Scoops, are notorious of creating their own sound caused by phase issues, due to the nature of it's design.

Since it is your first encounter hearing that design, you may want to give the box the benefit of the doubt. If you hear the box again used by someone else and, you encounter the same experience, then you can draw to the conclusion, that the box is the root of the phenomenon. 

Best Regards,