Isoacoustics Orea vs Townshend Seismic Pod on Components
Feliz Navidad!!! to everyone from Badalona Spain. @lemonhaze you are correct, if my math is correct modes for my room are 34.1Hz ,42.95 Hz ,54.84Hz,..., The energy at 28.5Hz is a strange one, I will need to continue to move the subs around and see if I can correct it. If I can't correct it with the the sub placement then it might be a room mode given the vaulted ceilings.
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Modes are calculated based on wave lengths and room dimensions. This is a gross simplification. In reality a great deal of energy gets into the walls, floor, and ceiling causing these structural elements to vibrate and produce sound of their own. Some of this due to acoustic energy, sound pressure waves cause the walls to move, store and release energy. A lot is also directly transmitted into them by speakers coupled to the floor by spikes or whatever. Isolating speakers on Podiums effectively eliminates this direct path, greatly reducing acoustic problems in the process. Once my whole system was isolated this way it was shocking how great an improvement it made. One can easily expend a great deal of time and effort trying to damp and remove this, when it is far easier and more effective to eliminate the problem at its source. |
@millercarbon I already have the speakers in the podiums. Given the dimensions of my room, those are the room modes and as far as I understand there isn't much it can be done, practically because the room has to continue to function as a living-room. The standing energy at 28.5Hz might be able to be tamed by the subs orientation and lowering a little the volume but if it does not improve then I will live with it because as far as I can ear the room's acoustics are pretty flat. BTW do you know what app Townshend used in their videos and if they used an external accelerometer? I got a couple of apps but none are sensitive enough on an iPad. |
It might be an Android. I don't know. Note mechanical is only one part of the energy going into walls, there is also acoustic energy. Main point I'm trying to get across is measured modes are not always entirely due to the shape of the room and speaker locations. Those are a big part of it but the room itself has resonant frequencies determined largely by the composition and structure of the room itself. Walls in other words, made of 2x4 and sheetrock, absorb energy and resonate, releasing energy back into the room. Another reason why a DBA is so much better than the old school one sub with EQ and tube traps. I have to wonder though, 28.5Hz? Never in my life heard anyone say Wow your system sounds great! All except for that dip at 28.5 Hz. Either you have perfect pitch, or.... |
