+1. I actually tried to start something like this a while back:I downloaded several VM apps and think I found one that'll work. Not knowing the first thing about vibration meters I assume XYZ axis does the trick. This one seems sensitive enough. If this does work out then we will have a VM solution for iPhone users. No more guessing when it comes to tactile response, if it works out.
Last few days I've testing a few things out regarding tactile improvement. I forgot to mentioned that I have rubber isolators that replaced my seating feet. I'm sure this amplifies the tactile response as well. It made a difference before with the seats mounted on concrete. With the sound intensity and PVL being primarily responsible for tactile feedback, I wonder if it's of any benefit having the sub mounted on the riser.
One thing that would be of huge benefit is if we had a database/thread for tactile like what this thread has accomplished. Where a person could go and get the info and product data needed to get the needed or wanted response. Comparisons of passive and active risers/platforms and seating. Explore and find that perfect balance of spl to tactile, for example, at [email protected] is should 5.2vm or whatever the optimal number is and to achieved you have to do this and this. To me tactile is as important as having a sub.
Not yet but will try that tonight or tomorrow.+1. I actually tried to start something like this a while back:
The only challenge to this is measuring in the vertical axis. In my room, when placed on my seats (horizontal axis), I get considerable shaking between 10 and 20hz, and not much after that. But what I can tell you is that I also get as much shaking above 20hz...but it's against my back (vertical axis) and not my seat cushions.
The other things that this cannot measure is that 'kick in the chest' feeling, which likely could only be measured via a Sound Intensity meter like the Microflown.
Were you ever able to test how much your riser shakes with your nearfield subs off?
Yes...still got it. #1 largest room on the list. Dominating all ya'll fools!!!!V18.2 of the ULF Calculator now available
- Added new PSA Subs (V1500, S1500, S3000i)
- Added new RA Subs (Echo 15, Echo 18, Gamma 15, Gamma 18, Gamma 218)
- New ULF Members @coolrda, @galonzo
- Updated ULF Members @Ted Sheckler, @derrickdj1
- Separated the Member ULF Score Data into its own spreadsheet on post 1 (ULF Calculator exceeded upload limits)
What do you mean "takes run from .3-50hz"? I can interpret sine waves in this range, but outside of this range it cannot?The VibSensor takes run from 0.3-50hz. You can take runs from 10 seconds to 5 minutes.
My interpretation of this is that the most movement occurs on the Z axis (side to side). The fronts only recorded an rms value of .14 for Z. The rears recorded an rms value of .26 for Z. The combination recorded a value of .28 for Z for both.It uses three sensors, front to back(Y), top to bottom(Z) and side to side(X) and displays all axis separately and combined. Heres some screen shots of a few runs. I used the 60hz-1hz 30 sec sweep primarily.
I understand what you're trying to demonstrate here. Different frequencies shake the riser in different ways. But the 40hz frequency you referenced, is that in relation to the hz in your images, or is that just the frequency that was excited through your tones?Here the blue is the Z axis, the red Y and the green X. Theres been a lot posted about the different characteristics of tactile response, the pulse, the wobble, etc. I experience this playing the first minute or so of the latest Transformers, the extinction scene. The initial pulse followed by the rumble. Its one advantage that a sub has over transducers. Theres never been a good explanation that I've read of whats happening and why they feel different. Playing the 60-1hz sweep notice what happens.
Z axis and combined.
Where the Z axis, Blue or top to bottom starts to dominate is about 40hz. Above 40z though the Y axis, red or front to back movement dominates which could be why it feels like a pulse wave as intended. The different characteristics could be frequency dependent.
Since this was a simple swept tone from 60-1hz I was just guessing as to the frequencies where the Y axis vibration dominated. The Power Spectral Density actually breaks it down better. I'll include the logarithmic PSD too.Great stuff, @coolrda. Have an understanding of this is incredibly meaningful IMO, but almost always overlooked. It's tough to have a precise measuring rig for this, but certainly exploring like you and others (@bassthathz) have done helps advancing our collective knowledge base. The trick (at least for me) is making it simple enough to interpret and use to make mainstream so that it's easy to build the overall database that we all can learn from (similar to what I hoped to achieve with the ULF calculator).
What do you mean "takes run from .3-50hz"? I can interpret sine waves in this range, but outside of this range it cannot?
If it's just measuring vibrations, why is there a tolerance from a certain frequency range? I guess that also leads to my question in your images below: I see the software references Hz...is that Hz generated by the motion of the phone, or is it somehow recognizing the sweeps your playing?
Just curious how you are interpreting that.
My interpretation of this is that the most movement occurs on the Z axis (side to side). The fronts only recorded an rms value of .14 for Z. The rears recorded an rms value of .26 for Z. The combination recorded a value of .28 for Z for both.
So the combination of the fronts and the rears didn't significantly change the vibration of the rears?
I understand what you're trying to demonstrate here. Different frequencies shake the riser in different ways. But the 40hz frequency you referenced, is that in relation to the hz in your images, or is that just the frequency that was excited through your tones?