Lost Studios 3.0

haven't expected such inappropriate reaction from admin

The action is entirely appropriate. That's what admins and moderators are supposed to do: keep the forum running smoothly, and keep unruly members under control. [... most of reply removed, to clean up the thread at the request of the thread owner] I probably won't be bothering to reply to your posts much in the future, because clearly you have no interest in learning anything about acoustics, by your own admission you don't want help with a project, and apparently you are only here to troll the experts and annoy the experienced studio builders. - Stuart -

[DISTURBING POST DELETED BY MODERATOR AT THE REQUEST OF THE THREAD OWNER, AND ALSO FOR VIOLATING FORUM RULES]

Sorry about the mess on the end of your thread, Tom! Let me know if you want me to clean it up. I don't normally delete spewed putrefaction like this, as it speaks volumes about the mental situation of the poster and nothing about the actual thread, but it's your thread: If you want me to remove the sewage, I can do that and leave your thread clean again, but if you prefer to let it stand, that would be fine too. Your call! Follow up: Tom did indeed ask me to clean up the thread, which I have done. Summary: The poster appears to have been a child, or childish troll, with grand delusions of knowing something about acoustics, but obviously no actual understanding, plus a very poor grasp of the English language, a foul mouth, and a big chip on his shoulder, and perhaps also mentally disturbed. Vaguely reminiscent of another former forum member from a few years back. Perhaps this was meant as some type of "revenge"? The troll has been banned and blocked. For the record: What Tom did by using semi-rigid mineral wool batts in the cavity between the two leaves of his wall, is perfectly correct, and unquestionably the right way to do it. The insulation acts as a damper on the MSM resonance (and other resonances) going on inside the wall, greatly increasing the isolation of the wall. There could be a different of of up to 15 dB in isolation from using or not using insulation in the wall. This is not in question, despite the insinuations of the troll. Putting insulation in the wall cavity changes the way that the air behaves with regard to heat, from adiabatic to isothermal, and reduces the speed of sound. The apparent path length appears to increase, the MSM resonant frequency is forced down lower, and several other positive things occur. The way Tom installed his batts does not create any "bridges" or flanking paths across the cavity, and the leaves remain correctly decoupled. Once again, Tom: congratulations on your studio! :thu: It looks great, and I'm sure it sounds great too. Feel free to update the thread with additional photos and comments, so that it does not end on this unfortunate sour note! In fact, it might be interesting to do some isolation tests on your room, to demonstrate just how well it does work, and post the results right here! - Stuart -

Soundman2020 wrote:

The troll has been banned and blocked.

Whew! :cop:

Soundman2020 wrote:

For the record: What Tom did by using semi-rigid mineral wool batts in the cavity between the two leaves of his wall, is perfectly correct, and unquestionably the right way to do it. The insulation acts as a damper on the MSM resonance (and other resonances) going on inside the wall, greatly increasing the isolation of the wall. There could be a different of of up to 15 dB in isolation from using or not using insulation in the wall. This is not in question, despite the insinuations of the troll. Putting insulation in the wall cavity changes the way that the air behaves with regard to heat, from adiabatic to isothermal, and reduces the speed of sound. The apparent path length appears to increase, the MSM resonant frequency is forced down lower, and several other positive things occur. The way Tom installed his batts does not create any "bridges" or flanking paths across the cavity, and the leaves remain correctly decoupled.

This makes total sense to me. If you've ever handled semi-rigid insulation, it's hard to imagine it forming a flanking path between two surfaces, even if touching them both. This all echoes a post I found very helpful back in 2015 about the correct insulation to use in wall cavities. viewtopic.php?f=2&t=19992&start=15#p136498.