rew waterfall - how does this look?

[CharlotLouie]

Hi everyone

Does this waterfall look ok?



Even after watching several vids, like this one:



I am having an issue understanding how to properly read what I see. I guess, because mine doesn't look like what I see in the vids.

Thank you.

 

[bouldersoundguy]

It looks to me like there's some resonance between 20 and 150 Hz, but it's at a fairly low amplitude.

 

[rob aylestone]

The thing to remember is that all they do is show the amount of energy at each frequency. However, you haven’t explained what signal you put into the system, how you generated it, and how you got it back in?

I’m assuming you played some pink noise into a space, through loudspeakers, then stuck a mic out and recorded the room sound? This is the resultant trace. Or did you generate the noise into your daw, and what we are seeing in the trace from the audio generated totally inside the box? That would hopefully generate a totally flat line on a 2 D display, and a hump with flat top on a 3D display. In a real room, what you would see is an amalgam of the speaker response, the microphone response and the room components. It wont be flat. If you use a measurement mic, that has a very flat, omni response, then you are pretty much seeing the room and the speakers. If you took the measurement mic outside with the speakers, the. You’d see just the speakers, and probably a few birds!

On its own the trace tells us very little without context.

 

[Slouching Raymond]

Looking at that colourful top picture, it is in 3D.
Left to right is frequency, bottom to top is volume, and from rear to the front is time.
I would guess they generate a spike (=all frequencies), and measure the frequency response over time.
Those foothills at the front/left will be the lower frequencies reverberating in the room.
The measuring mic can only be in one place though.
If they are going to publish that picture, they ought to explain just what it means.