@arafiq I am glad you found something that made a difference for good in your system.
@millercarbon music is to be listened and enjoyed more than measured. What I am learning on this forum, is that people like to make opinions and believes into facts and then since there is no way to prove things get out of control in anger.
I think I mentioned before, I only measured because the sound quality changed so much that I though that there had to be a way to measure. There are ways to measure how sound changes, and I have used these measurements to help me understand why I was not hearing differences when others claimed that there was. I know I am gifted with sensitive ears so to me was more like a sanity check if you wish. I did not hear much improvement when using the IsoAcoustic products from spikes or even cork, but when I put the Nobsound I did, at the beginning the sound sounded dull, but at least I was able to hear a difference. That is when I started to think how to go about more scientifically and measure. I always let my dealer place the speakers, and my partner to setup the TT, but this time I had time in the USA for me to experiment and learned a little about sound. As a result now, I can somewhat back up and explain what I hear with measurements to my partner and friends. These experiments learned me how connect the dots in my ear and systems.
I do not know how accurate the iPad seismograph is so I can't comment. I was shown by friend how to measure the effectiveness of isolation and decoupling with an accelerometer and a laser. It very well be that the accelerometer in the iPad is good enough, I just do not know any of this stuff. I started to be curious a long time ago but did not have the time to spend time doing experiments and learn.
I do experiments and math for living and I listen to music to peace my mind. I will not be doing more of these measurements until I get the new racks and see if they make a difference that I can quantify.