Hi - I am trying to understand the frequency response of a prototype box I built as part of my Overnight Sensations build.
I'm using the quasi-anechoic guide over at ASR.
When I do the sweep measurement, I never see a clearly defined reflection that everyone refers to. This is supposed to happen around 5-10ms, depending on the room you are taking the measurement in. I've attached the raw REW impulse response graph, and you'll see that there is maybe a spike around 7-8ms, but there is also a bunch of noise between 0 and 7ms. Other graphs I've seen have very little noise and a very clearly defined reflection point.
I'm taking this measurement in my garage, with a calibrated mic on the end of a pole to limit reflections form the mic stand. It is about 5' away from the closes wall and floor. I do live on a noisy street, where you can subtly hear cars at all time, but I'm measuring at a pretty high volume in an effort to improve the signal to noise.
Can anyone tell me if my measured response looks even close to right? Does my setup look ok? Any thoughts as to what the problem might be?
Thanks!
I'm using the quasi-anechoic guide over at ASR.
When I do the sweep measurement, I never see a clearly defined reflection that everyone refers to. This is supposed to happen around 5-10ms, depending on the room you are taking the measurement in. I've attached the raw REW impulse response graph, and you'll see that there is maybe a spike around 7-8ms, but there is also a bunch of noise between 0 and 7ms. Other graphs I've seen have very little noise and a very clearly defined reflection point.
I'm taking this measurement in my garage, with a calibrated mic on the end of a pole to limit reflections form the mic stand. It is about 5' away from the closes wall and floor. I do live on a noisy street, where you can subtly hear cars at all time, but I'm measuring at a pretty high volume in an effort to improve the signal to noise.
Can anyone tell me if my measured response looks even close to right? Does my setup look ok? Any thoughts as to what the problem might be?
Thanks!
Attachments
You have that ladder that is far from ideal so close to the speaker. Use thin ropes/ cords to suspend your speaker at the midpoint betwwen the rafters and floor. Try to get a sphere around the speaker clear from any reflective surfaces. Then use this to calculate the floor bounce
https://mehlau.net/audio/floorbounce/
You still will get some diffraction signals from the speaker edges but it should be cleaner.
https://mehlau.net/audio/floorbounce/
You still will get some diffraction signals from the speaker edges but it should be cleaner.