masi1157 wrote:keesje wrote:Let's get the app's & get it over with. Sidelining the OE marketing departments as we should always do.
So you are expecting reasonable results from a bunch of people that don't really know what they are doing, using a wide variety of smartphones (and apps on their smartphones) producing uncalibrated and widely scattering readings, without knowing what the aircraft they are sitting in is currently doing, how it differs from the aircraft of the same type that somebody else tried to "measure", and don't know what it should be like and what it should be doing to produce comparable results? Enjoy!
I can tell you, you will find levels varying by easily 3 dB(A) or more measured by professionals with professional equipment at the same position on 2 aircraft that should have been (from all the parameters you can control and compare) exactly identical in terms of cabin noise. It is just aircraft to aircraft (or even flight to flight on the same aircraft) scattering. And it can be 20 dB(A) and more if you only compare different locations and/or flight conditions on those 2 "identical" aircraft. So how many data sets do you want to collect before you come to any reliable conclusion? It will be hundreds if not thousands just to find a tendency comparing aircraft type A to type B.keesje wrote:Unless some doesn't like the answer. Then again w'll see attempts to discredit, confuse, demand sources, dismiss as AvsB, generalize, false comparisons, strawman's etc.
Is that the game you want to play? Then play it without me. I very much hope your bunch of "test data" will be looked at very very critically by somebody else then. Btw, I am as critical with that "6 dB quieter" claim. But it seems nobody else but the TO ever saw or heard that anywhere and can tell us, what that claim was all about.
I'm convinced we can work out something with an app. If many people have it, do the measurement, log the flight number, seatnumber, time, cruise attitude that might be a start. (FGS put it in aircraft mode first if an FA asks ) After getting a few 100k measurements, we can do the statistics, we might have a reasonable results, including margins. Maybe seatguru.com can jump in, adding it to their app. The power of the masses that has been changing everything, for better or worse.
I just got https://play.google.com/store/apps/details?id=coocent.app.tools.soundmeter.noisedetector&hl=en_US & will test in the upcoming weeks (lots of flights). It's a fun app to have . In the end we need all the same calibrated tool & instructions. I just sneezed, 82db.. Over the last 11 minutes my average was 59db, max 82 (sneeze, min 38db).