My measuring tools don't go below 20Hz but I've got a lot of 20 in in-room response. Manufacturer claims my speakers can go flat to 16Hz boosted. At 8Hz though I'd be worried about making "softer" things in the room like gypsum or drywall resonate. I've already had to re-secure lighting fixtures that began to rattle and I don't listen very loud very often.
Color me skeptical. What amplitude of subsonics is this thing putting out anyway? Biologically I believe we are wired to filter these frequencies out unlike Elephants that use them for communication.
to be clear; i'm not claiming to have heard in-room 7hz or 3hz. i only mentioned the specs of my speakers relative to this question....
Perhaps. Can you measure Extreme Low Frequency? Below 8 hz? Its below the threshhold of hearing... But could you record it?
......and i've not measured in-room. i make the point that speakers can do these frequencies.
what i will say is that my speakers are able to do whatever is on the recording without stress. there are digital recordings where you do get lots of information that is apparently under 20hz. and to do those flat without distortion you need your -3db point to be around 10hz somewhere. one recording that comes to mind i'll mention is Harry Connick Jr.'s CD 'She', track 7, 'Joe Slam and the Spaceship'. i've heard this on a few systems and the MM7's do it on a whole different level than any other. you feel it in your gut. if i turn it up i can sense my body is getting a bit disturbed. but the room is not rattling apart like other attempts at this track i have heard. it's the distortion that gets a room vibrating, not linear musical information.
there are plenty of other recordings where i'm getting very strong foot stomps and 'earth movements' thru the speakers which sound real like they are in my room on a level i've never heard. especially on 1/4" and 1/2" 15ips master tapes. this gets very spooky and it can truely make it real sounding. i fell this stuff through the floor (6" of concrete) and furniture as well as some i hear. a few times i thought i had someone outside banging. i have some pretty 'raw' master tapes which are 'forces of nature'.
pretty crazy stuff on some of these recordings.
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