@tsushima1 First let me apologize for my English.
At the end it does not matter what manufacturer claims and I do not care, because the measurable improvement cant be denied, at least by reasonable people.
There are 2 objectionable factors
- the experiments and measurements were done in one of my rooms and although the room is temperature controlled, RH and pressure are not, so these factors allow for some unknown variables. However the tests were done in multiple days and since the variability is well within the margin of error ( 1/10%) I am not concerned.
- I should have not reported the 1/100% because in this case given that I have done only 400-500 tests reporting 1/100% is not very relevant.
Although I am not a sound engineer I hold 2 PhDs on 2 different mathematical subjects, and I have had my experiments and tests assessed by 2 different colleagues/friends that hold PhDs in sound physics, and one with a PhD on mechanical engineer more specifically on isolation. Both of them also like audio systems.
I have done hundreds of tests, more than 400, the measurements are consistent and reproducible.
I am fortunate that I can afford to buy and test almost whatever I want, I have only alliance to my family and friends, and none of the companies I buy products from give me discounts, beyond what they would give to any good customer.
Maybe my impartiality and close relationships with numbers, tests and analysis might not mean anything to you, but who knows maybe you are open to accept that I have absolutely nothing to gain, beyond getting my systems sound as best as they can and hopefully help others to make their own decisions based on numbers, and not based on some unmeasurable description of the improvements.
In my environment and system, the facts and results are very clear, the Podium cut decay in one of my room/system got cut by 3x, distortion reduced by more than half.
After Xmas everything will be resting on Pods.
If you want to pick a manufacturer go an pick on IsoAcoustics Gaia and Orea because when it comes to isolation and measurable sound improvement they are worse than the $35 NobSound.
Here are my some basic test results
The original distortion from the fundamental all the way to the 8th harmonic get reduced:
4.72% average with spikes. (baseline)
4.64% average with Orea.
4.28% average with Gaia.
3.86% average with Nobsound 2-3mm space.
2.42% average with the Podiums.
2.11% with the Credo
I will average decays because I do not have time to go and type each frequency decay number.
Spikes for frequencies between 25Hz to 10K the decay average is about 603ms. (baseline)
Isoacoustic Orea for frequencies between 25Hz to 10K the decay average is about 561ms
Isoacoustic Gaia for frequencies between 25Hz to 10K the decay average is about 542ms.
NobSound for frequencies between 25Hz to 10K the decay average is about 389ms.
Podiums for frequencies between 25Hz to 10K the decay average is about 139ms
Credo for frequencies between 25Hz to 10K the decay average is about 122ms
Please notice that I make no sound claim, because it is subjective.
I use REW, and Earthworks TC20mp calibrated microphones.
Maybe next time you take the time and use REW (free and sound industry accepted) and a calibrated microphone (anywhere form $100 to $100s of K) to test and measure your next isolation/decoupling solution before dissecting the product.
If you have facebook, go and join Pathos, there I posted some pictures of before and after measurements in case you need to see the results in your own eyes. Which I would find it flattering so you could give your opinion.