Using REW Waterfall to calibrate sub instead of FR graph

I was wondering if anyone actually tried to calibrate their sub using he waterfall decay instead of FR graph? What I meant was that looking at the waterfall, there are usually certain freq where the decay is much longer then the rest. And subjectively these decay seems to hang on in your room. So what can be done is find out the exact freq of the long decay and do a EQ setting to reduce it and remeasure till the decay at the level is close to the rest of your freq.

Oliver

[Sonnie]

Hey Oliver.... you slipped in here on us man. Good to see ya again. Welcome to the Shack!

Whew... waterfall decay is way over my head. Hillbilly's can't go there. Hopefully JohnM will be around soon... or maybe one of other tech guys can help ya with this one.

Hee. Good you see this up and it looks great! I just need more traps in my room as 5 units of 2x4x4" bass traps hardly made a dent in my low bass decay. The room just seems to store and slowly release the bass notes. Thats why I was thinking of trying another way of EQing while I am waiting for quotes on redoing my room.

Oliver

[JohnM]

oliverlim wrote:

I was wondering if anyone actually tried to calibrate their sub using he waterfall decay instead of FR graph? What I meant was that looking at the waterfall, there are usually certain freq where the decay is much longer then the rest. And subjectively these decay seems to hang on in your room. So what can be done is find out the exact freq of the long decay and do a EQ setting to reduce it and remeasure till the decay at the level is close to the rest of your freq.

Ideally you should use both. Generally the peaks in the FR curve will have correspondingly long decay times in the waterfall, so fixing one fixes the other. However, the waterfall (or the spectral decay) curve can be better for identifying cases where what looks like one peak in the FR curve is actually due to two closely spaced modes, which become visible as separate peaks in the later slices of the waterfall or spectral decay.

I think I understand what you mean. Suppose for my case that means that I should be attaching with EQ the 4 long delay waterfall between 27hz to 40hz as shown here



instead of the 2 FR response from 37hz and 45hz shown here?



funny that for my case the waterfall problem areas and the Fr seems so different right? Or is this normal?

Oliver

[Sonnie]

Man that looks neat as grits... just wish I could understand it.

[bricor]

All of a sudden, I don't think my waterfall plot looks so bad...

bricor wrote:

All of a sudden, I don't think my waterfall plot looks so bad...

****.....

Good thing about concrete rooms is that it pressurise the room easily and you can get a tactile feel. But the room boom can really irritate you without any eqing.... Sigh. I would kill to get a waterfall and FR like yours.....

Oliver

Sonnie wrote:

Man that looks neat as grits... just wish I could understand it.

And I thought you are suppose to teach me

You know, not that I am picky, but that word just below your name on the left just does not seem right

Oliver

[jmprader]

bricor wrote:

All of a sudden, I don't think my waterfall plot looks so bad...

Is this with/without eq and/or bass traps?

How big is that room, what's the construction and what were your settings when you ran this?

Inquiring minds want to know.