CR Treatment and Tuning---The home stretch!!

[Soundman2020]

I have to say, it's looking rather nice!

- Stuart -

[Stadank0]

I know right??!! Lets hope it works as good as it looks...


A couple of things left to do. Should have some tests back in a couple of hours.....Stay tuned

[Stadank0]

Measurements sent!

[Soundman2020]

Cool! I'm out for the evening, but I'll take a look tomorrow, then find something else to keep you busy... (Don't want you getting bored, with nothing to build! )


- Stuart -

[Stadank0]

[Stadank0]

resent.

[Soundman2020]

And the results of Frank's hard work are in! . . .

OK, I'll do this in sets of three graphs. Each set of three shows first the original empty, untreated room. Then the situation we were at before these new poly-slat-walls went in, and finally the situation now, with the poly-slats completed.

So firstly, the RT60 graphs...

Frank-REW-RT---Baseline-Empty.png

Frank-REW-RT---1-mil-and-6-mil-plastic-strips--3.png

Frank-REW-RT---PolySlotWalls.png

Not much comment is needed for those three! The improvement is drastic, and clear. Originally the room was off the charts, then way too dead, and now it is is nicely live again.


Next, the waterfall plots for the low end of the spectrum (most critical):

Frank-REW-WF--18-500---Baseline-Empty.png

Frank-REW-WF--18-500---1-mil-and-6-mil-plastic-strips.png

Frank-REW-WF--18-500---PolySlotWalls.png

Here too the improvement is rather obvious: It is very clearly a lot smoother and flatter overall, and especially in the area that the slot resonators are targeting, which is around 50 Hz to 250 Hz (see prediction graph on page 6 of this thread).

And finally, the most important: Impulse Response. This shows how the actual energy levels change over time in response to a very short, very sharp, very loud acoustic impulse (eg, balloon bursting, or gunshot).

Frank-REW-IR---Baseline-Empty.png

Frank-REW-IR---1-mil-and-6-mil-plastic-strips--initial-2.png

Frank-REW-IR---PolySlotWalls.png

The improvement here is very dramatic! You can clearly see how ugly it was before this device went in: clear flutter echo, and very uneven "warbling" decay, but now it is smooth and even, all the way down. Obviously and unmistakably, the diffusion is working. Crystal clear. Remember way back on page 2 of this thread, I mentioned that I'm aiming for a decay time of around 220 ms? Judge for yourself from the above graph how we are doing on that...

So there's the current situation! A lot of hard work by Frank, and it is clearly paying off: the room is very definitely heading exactly where we want it to be.

Next up: Soffits.

I have extensively modified the original soffit design, for three reasons: Frank switched to different speakers that are larger, with different dimensions, and have very different characteristics from the original ones we were planning to use; 2) the changes to the rear wall, mostly the curved poly-slat walls; and 3) the desk is going to be very different from the original "placeholder" design. So Frank will be doing some changes to the soffit framing to accommodate these changes, then installing the deep bass traps below and above the speaker, then installing the speakers themselves properly with my proprietary floating system (we won't be posting all the sexy details of how that works... sorry!). After that, we'll do the small sections of slat wall above the sliding glass doors, and finally the cloud. Then we'll do the digital tuning to take are of the few remaining issues that can be adjusted like that, and that's it! End of story!


- Stuart -

[Stadank0]

Well,

That's a huge relief...I never know if my work is going to translate. Its a big leap of faith! so far so good.....

Thanks
Stuart!

[Stadank0]

Hi Stuart,

What's the ETA on the soffits?

finishing up the trim work on this end. will post some pics tomorrow after I paint the patch work.

[Stadank0]

Well I got the trim done but it looks like I did some acoustic harm in the process. I sent Stuart a new .mdat file....Lets see what now!


At least it looks pretty....

20180501_141613.jpg

20180501_141622.jpg

panorama.JPG

[Soundman2020]

Wow! That looks really nice, Frank! Excellent job!

but it looks like I did some acoustic harm in the process. I sent Stuart a new .mdat file....Lets see what now!

That's not an acoustic problem. That's a signal problem. Maybe soundcard, software compatibility, wrong driver version, ... or severely messed up speakers, or majorly mangled mic! So don't worry about the room: that's not the problem. Try with a different computer, different soundcard, or different mic, to help identify where the problem is.

- Stuart -

[Stadank0]

Got it sorted!

Dumb, stupid Mac OS update! glad that's all it was...

[Soundman2020]

Dumb, stupid Mac OS update! glad that's all it was...

Cool! I mean "cool" that you figured it out and fixed it, not "cool" that it screwed you around like that!

The new data is fine.

- Stuart -

[Stadank0]

At least we know what the laptop mic looks like. Definitely can't tune a room with that..

[Stadank0]

Ok....Half the room is officially done! Tapping the fingers!

One thing is for sure...I'll never get sick of looking at it!

20180502_185231.jpg

20180502_185258.jpg