https://www.acousticsciences.com/product/tubetrap-bass-trap/Hello,
can anybody explain what basic physical principle (Absorption, Diffusion, Damping...??) these tube traps are based on?
To me it's not clear how (why) they work ...
... beside the effect that they shrink the room ...
How can they effect, calm a 50Hz Air-Wave in a room...??
ROCK-ON!
The link i posted explains pretty them thoroughly, I thought.The tube traps had a patent (now expired?), so you could probably get some info from that.
The link i posted explains pretty them thoroughly, I thought.
These are only tube traps to the extent that they are tubes and porous absorbers. They aren't sealed and don't have reflective surfaces like Tube Traps. I'm not advocating or dissing Tube Traps, but we are basically dealing with porous (velocity) absorbers. These types of absorbers will effectively absorb frequencies whose wavelengths are 1/4 wavelength or less of the thickness of the panel from the nearest boundary. For instance, to effectively absorb 100 Hz (11-foot wavelength) a velocity should be placed 11/4 feet (2.75 feet) from the wall or ceiling. In practice, less depth will still be effective due to the random incidence of sound waves, so maybe even as shallow as 1/10 wavelength will have some effect, given enough panels.By the way, Eric's version of the tube trap are basically rolls of porous material. So basic porous absorbers shaped as tubes.
Also, i noticed a few things that are just wrong. for example, there was a video showing measurements of his VPR panels, he points a change of about 2 dB at 60Hz and concludes that they are effective while saying his microphone might have moved a bit and he added lots of panels between the two measurements. I don't think that 2 dB for about 20 (expensive) panels is really effective acoustically speaking, but that could be me.
Another example, in this latest video (the end of the end of the rainbow) he begins by stating that there is not yet a door between the control room and the machine room. So he's telling us that he spent months (according to him) treating and measuring a room that is acoustically coupled to another room... This is basic acoustic. I consider myself the degree 0 of acoustic engineering but one of the first things i learned was you have to isolate your room first, treat second.
Well, again there is also some good things about his videos, and in the end he seems happy with the result. I just think he took a really long path to get there. He could have make it shorter.
Nobody says Tube Traps don't work - they are very effective. They are, however, expensive. A similar result can be achieved with standard flat porous absorbers, at a much lower cost. If you have the money and like the aesthetics of the tube traps, by all means, go for it. There are also plenty of DIY examples of tube-trap-type devices that will perform well.I was skeptical when I went to a demo given by Mr Noxon (ASC) at RSPE they had the attack wall set up and it was great but inside a professionally designed room already. Then he talked about the studio traps and set them up in the stairwell, when you get in the middle you can hear what it does it's pretty amazing. Something else that works and seems strange at first is
https://deltahdesign.com/zr-acoustics/
The people I have met who have been to Delta H's showroom were required to sign an NDA, so, there's that, too.
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