Don’t waste your time with daytime noise measurements

Last week I got an urgent call to measure noise from installations as soon as humanly possible, in a project which have had some problems with too loud ventilation. The problem had just been mitigated (hopefully) but they still needed a protocol to give the green light to the building. I basically booked the next possible flight and went to Stockholm. Usually, I hate doing these one-day trips. They can often be exhausting. This time however, it wasn’t a complete disaster. I had planned extreme margins both before and after the measurement. Still, I learned a couple of valuable lessons on why these one-day trips are a bad idea anyway.

Engineering, AcousticsRikard ÖqvistDecember 12, 2022noise, installations, ventilation, acoustics, buildings, quality Comments

It’s not over till the fat lady sings

For weeks on end, our home and office has been like a construction site. But today, our last (planned) renovation project – a brand new office air heat pump – was installed. This calls for celebration indeed, however, I don’t think we have earned it just yet. There are still plenty of extremely small things that I think needs to be taken care of before we can claim “mission accomplished”. Things like scanning the lawn for leftover screws and nails, small chunks of insulation, packaging materials, leftover wood etc. And finally, a proper house-cleaning. One should be careful to claim a project is over prematurely.

Acoustics, DiaryRikard ÖqvistOctober 25, 2022noise, heating, health, workComment

Silence

The shoemaker's children go barefoot. In my case, that was exceptionally true up until today. I’m an acoustician, which means I have devoted my life to improving the world by improving sound quality. That’s why I have been so embarrassed by my own personal living environment. We had in our kitchen one of those old kitchen cupboard FTX ventilation units including a kitchen fan with the suction power of an asthmatic sucking air through a straw. But that’s not even close to the real problem: The noise. The old unit produced an earth-shattering 42 dBA and 62 (!) dBC in our kitchen. Throughout my whole career, I have never come across anything worse in any dwelling. It was up until today the literal definition of how to NOT practice what you preach.

AcousticsRikard ÖqvistSeptember 26, 2022acoustics, ventilation, sound quality, noise, health, sleep, annoyanceComment

Sound pressure level from E-drums

The greatest difference between acoustic drums and electronic drums is that you can control the sound pressure level from the electronic drums by turning the volume knob. Whereas an acoustic drum kit will produce a sound pressure level that is what it is. If you want to play rock or metal, you need to hit the drums hard, or it will not sound or feel right. Consequently, the sound pressure level will be very high. The drummer only has one option, and that is to wear proper hearing protection while drumming, or face a near certain risk of permanent hearing loss. With the E-drums on the other hand, you can choose whatever sound pressure level that you like, and your ears will be safe. Or will they?

Acoustics, MusicRikard ÖqvistMay 17, 2021drums, edrums, noise, acoustics, sound, hearing, tinnitus, sound insulationComment