Hours 47 – 50: Metal Resonance Experiment

Hello! Today I spent a lot of time playing with an idea that I was inspired to experiment with after seeing some others do similar stuff online. This was to use a subwoofer to produce very low bass frequencies in order to resonate objects, in this case, a large metal filing cabinet. I placed the cabinet on top of the woofer, in order for it to be directly manipulated by the vibrations of the bass.

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I used a pair of 414’s, in a kind of wide A-B setup for the most part, to capture the sound of the resonating cabinet. These were going into the Sound Devices 633. I then manipulated different frequencies within pro tools, generating sine waves between 20hz to around 80hz. These super low frequencies made the whole room shake, particularly the cabinet on top of it. I used the frequency cut built into the 414 to take out the very lowest frequencies, leaving me with just the effects of the bass on the metal (mostly).

The sound is really cool, almost reminiscent of dry ice on metal. The way it ebbs and flows with resonance is really organic I think, and could be used in a lot of different applications. I then decided to experiment with having a mic inside the cabinet whilst recording, and keeping one outside to capture more of the sound in the space.

Again, the sound is very cool. Lots of body to it, lots of nice metallic resonances captured by the inner mic. The sound is a lot more heavy and focused, but maintains that sense of space captured by the exterior mic.

I then turned my attention away from the metal resonances, and thought about other elements that I could manipulate with the bass vibrations. I decided to experiment with some rubble style sounds, inspired by my recording session recently. I put some small rocks, and other interesting objects into a cardboard box, and experimented with frequencies that’d produce a rumbling, shaking sound.

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The results are almost reminiscent of a film earthquake sound, like a tremor is vibrating household objects. I think the rate of resonance in this example could have been a little slower, but the subwoofer wasn’t powerful enough to re-produce frequencies low enough for that to happen!

That’s it for now! As ever, thanks for reading. I’m excited that this is the half way post! just another 50 more hours to go. I’ll be back again soon with more cool stuff.

-Barney

http://www.barneyoramgameaudio.co.uk

Hours 47 – 50: Metal Resonance Experiment

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