Planar Speaker Asylum

RE: that never happens

71.201.21.50

This Post Has Been Edited by the Author

In Reply to: RE: that never happens posted by hemholtz on September 10, 2012 at 12:34:18

"faster," "tighter" etc are all descriptors used to convey the time-domain behavior of bass reproducer systems, and with the lower frequencies the "reproducer system" includes the cabinetry (if any) and also stuff in the room that may be set to vibrating at these low frequencies. I think furniture etc probably DOES get put in motion by bass, but I don't think it gives back much of that stored energy as sound. The room itself- by this I mean the floor, walls, etc- I think this DOES release some of it's stored energy back as sound. The walls / floor etc of a room will "bulge out" slightly when there's a pressure wave crest in the room, and the elasticity of the walls etc will want to relax back to their unstretched state and so the room will "bounce back" a bit, compressing the air in the room - all of this will be frequency dependent and very complex.... a room with rigid boundaries will do LESS of this, so a room with concrete floor will sound "tighter" "more solid" etc, and if the walls are also concrete- even more so. But I think these effects are much smaller in magnitude than those from the cone, cabinet enclosed volume (if any) and cabinet wall behavior. I think we can hear the release of energy that gets stored in the subwoofer cabinetry and that's why baffle-less subs can sound "faster" than box subs.

I don't think magnitude vs frequency graphs will show this directly, you'd probably need some kind of TONE BURST measurement to see this- you'd need to see how actual bass tone pulses behaved in time, not just impulses or steady-state waves. Like a repeated train of pulses of 7 cycles of a 20 Hz signal, with a pause between them say of 50 ms or something, and watch the build-up and die-off characteristics on a 'scope,

Follow Ups: