Hi all - I'm following the excellent sticky post quasi-anechoic measurement guide to understand the frequency response of my Overnight Sensations build. My goal is to take measurements of a test box I built, which isn't very well air sealed nor does it have any polyfill. I'm curious how this test box will ultimately compare to the finished build in a month or two.
I live on a busy road, so finding a very quiet space isn't really possible. I'm taking these measurements in my garage, where you can still hear low rumbling road noise and also the low hum of the power amp I'm using for testing. This is about as quiet as I can (easily) make the space.
The impulse response I'm getting doesn't show a very clear reflection spike around 6-8ms like I see in all the examples I've seen on the forums. I assume other people are taking valid measurements in environments that aren't perfectly quiet, but maybe I'm wrong.
My question for those who know more - does the attached impulse response look like my calibrated mic might be bad (or something else in my signal chain) or could this just be due to the environment not being quiet enough?
Another note: I was taking measurements at a pretty high SPL, in order to improve the signal to noise ratio. But the SPL of this mic is not calibrated.
I live on a busy road, so finding a very quiet space isn't really possible. I'm taking these measurements in my garage, where you can still hear low rumbling road noise and also the low hum of the power amp I'm using for testing. This is about as quiet as I can (easily) make the space.
The impulse response I'm getting doesn't show a very clear reflection spike around 6-8ms like I see in all the examples I've seen on the forums. I assume other people are taking valid measurements in environments that aren't perfectly quiet, but maybe I'm wrong.
My question for those who know more - does the attached impulse response look like my calibrated mic might be bad (or something else in my signal chain) or could this just be due to the environment not being quiet enough?
Another note: I was taking measurements at a pretty high SPL, in order to improve the signal to noise ratio. But the SPL of this mic is not calibrated.