You need to take one of the HR92s off the valve completely so it's not under load and then test it. It won't get any quieter than that. If that's still too noisy for you then unless you are prepared to do something like covering the HR92 to dampen the vibration through it's plastic body, you're unlikely to end up happy.
Testing with a noise meter to make this more quantifiable is a good idea, but as Paul said, noise pollution is very subjective and an annoying noise to someone might not even be registered by someone else.
Also, using a phone app is not really going to give us accurate results if we're trying to compare each other's HR92s. Even professional sound meters need to be calibrated regularly to ensure they give accurate results and unless everyone uses the same model of phone and is very careful about how they take the readings I'm afraid we're going to end up with misleading data.
Testing with a noise meter to make this more quantifiable is a good idea, but as Paul said, noise pollution is very subjective and an annoying noise to someone might not even be registered by someone else.
Also, using a phone app is not really going to give us accurate results if we're trying to compare each other's HR92s. Even professional sound meters need to be calibrated regularly to ensure they give accurate results and unless everyone uses the same model of phone and is very careful about how they take the readings I'm afraid we're going to end up with misleading data.
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