Soundman2020 - Studio Design Forum

Nicely described. So in other words, am I correct to think you can have air moving faster than the outlet as long as it's not a ridiculous differential right before the properly sized grille, and the fast moving areas like your silencer are sufficiently isolated to prevent any whooshing being heard?

I like that idea with the lighting!

The current fan controller has 4 settings: off, low, medium, high. I've located it under my desk so I can switch between them without getting up from the desk. Very useful for what you mention and switching it on/off for recording quiet instruments.

6649 Thanks Glenn. Im not 100% sure what you mean by a plenum, but I'm imagining some type of box that the registers are attached to, large enough to slow the air down significantly so it just kind of falls out of the register silently? And if I use one of those, then my silencer can just be the sa...

That make sense Glenn thank you. I reckon I could get away with a slower and therefore quieter fan speed yet, so at some point I may get a variac that supports lower speeds. Or even connect it in series with the 3 way switch currently used the gives low, medium and normal speeds.

Cheers!
Jennifer

I sealed the joints on the supply plenum, put in a gasket for where it meets the wall, and added duct liner to it. Having a layer of OSB behind the plasterboard made screwing it to the wall easy. The plenum only contacts the knee wall, it will not touch the soffit baffle structure or faces. 20240212...

Thanks Glenn.

I should have been clearer about the SPL results from above about 500Hz in the room below, there may or may not have been an effect from the isopod, I just couldn't measure it because the sound had disappeared into the ambient noise above those frequencies. I could feel the shelf & frame the spe...

I'm trying to discover if having the monitors bolted to the wall will put more sound into the house structure than the current setup, which is the monitors on Genelec isopods on speaker stands. To this end I compared a monitor bolted to its shelf within the soffit, to the monitor sitting on the Gene...

Nice one! About 8 years ago I made lots of absorbers with metal corner bead for the front face. The metal bead looks brilliant and very professional under self coloured fabric (wood doesn't). I found working with that corner bead for this purpose a major headache though. I was worried about sharp ed...

Thanks Glenn, very useful information. Cheers!

I've built the shell of the ventilation supply plenum from 18mm OSB and done a test fit. 2024-02-01 12.31.07.jpg 2024-02-01 12.26.27.jpg 2024-01-31 17.35.42.jpg It fits entirely within the soffit structure and does the following; 1) Routes the airflow from the grille in the knee wall to the side of ...

I made an access hatch in a ceiling for changing air filters. There may be easier ways to achieve this, but it worked. I used 8 screws and a gasket to ensure it was airtight. Details here:

viewtopic.php?p=3833#p3833

Thanks Glenn, that's a good benefit it has in preventing the insulation from getting compacted, I hadn't thought of that.

Cheers!
Jennifer

Progress has been slow because of using the room for recording, and also Christmas and new year. Here's the latest update. 2024-01-02 19.38.29.jpg I've attached the ventilation plenum to the wall vent, which has a 200mm diameter duct flange for the room ventilation. I have several options for routin...

The 90° turns matter yes. Here's a quote from a post on another thread about how I calculated the pressure loss for one of my silencers. Plug in your own values taking special care of the different measurement units involved. Here's a direct link to the post, and the thread also has some good inform...