Hi,
I just wondering how good are your actual measured frequency responses at your mixing position.
What dips and peaks are left after acustical treatment? Just to get a feeling how good my treatment is.
You can see some Before / After results here:
Density Report
The graph below shows the LF response in my 26 by 15 living room from a few years ago. I've since added more bass traps, but this will give you a sense of how good you can get with a lot of traps. There are newer and more detailed graphs showing Before and After for an 11 by 17 foot room in my Hearing is Believing video.
--Ethan
Recovered from web.archive.org — originally hosted at http://www.realtraps.com/ethan-ht.gif
These are mine:
green - untreatedred - acoustical treatment, but without correct installed first reflection point absorbers. And without an additional 1000x625 Thermohanf panel ("hanf" german for hemp) as basstrap in the upper room corner, covering the porthole to the upper "room" (don't know the english word for a unused room under the roof).
You see I'll learned a lot from this forum ... 8)
I will measure again when the room is finished. E.g. the right funiture, a couch. And then we'll see.
Do you see the dip at 90Hz? Those which looks like a low pass filteres rectangle impulse untreated?
I suspect my bass driver of the right monitor are damaged or my power amp are wrong.
Indeed I expcet not that much improvement. The main improment was one superchunk in the corner.
I measured during building absorbers, so I think I got a good feeling now.
your curves are the ones I studied most detailed ... except those of my girl friend ... Ahem ... :)
Maybe you missed these "curves" from another girlfriend:
Acoustic Treatment Exposed
Warning for puritans: The video above contains full frontal and backal female nudity. :mrgreen:
--Ethan
;-) Yes, I missed it.
Curve discussion - the best of mathematics ...
But - to big boobs can restrict the hearing sometimes. I think most of the highs will be absorbed ...
So, back to acoustics ...
I measured the room again. For comparision the last measurment is included as well (I hope it the same). Note - the ruler scales are different from those of the last post.
Differences are:
- Leather couch in the middle of the room (at 38% from the backwall, but not due to acoustic but to go behind it through the door an othe side)
- installed 100mm thermowall panel (covered with plastic and fabric) in the upper room corner (where the hatch to the attic ist). So the whole rear wall - ceiling corner is covered with a corner absorber.
- installed first reflections point absorbers on the right position (with mirror)
- installed corner "basstrap" absorber (a 1250mmx625mmx100mm Thermowall again) on the frontwall-floor.
red is current measurting, green is the old one
I still wonder where the 300Hz null comes from.
What kind of spreakers did you use?
i can`t belive that a speaker have that much energy under 20hz :shock: down to 5hz :?:
There must be something wrong with measurements :cen:
Hi Mika,
good question. Indeed I did not care about frequencies below 50 Hz. I use JBL LSR32 flush mounted, their rollof begins - AFAIR - at 50Hz.
I think the slight increase from 300Hz downward is due to the flush mounting - indeed I like it and do not even want to compensate it.
The increase below 50Hz is indeed interessting. I have several ideas, starting with accidentally used compensation curve. (in this case it starts at 40Hz) or wrong compansate C-Curve (e.g. the audio out of the SPL Meter has no C-weighting).
I will check this out. I wanted to measure again anyway. Even the near field system (Control 1).
But I don't think this will affect the range between 50Hz and 4kHz in any way. But I'm a software engineer in the day job, so I've seen a lot of bugs that could never exist.
In my old studio I used the LSR 32 only to check low frequencies or when I want "pressure" (some guitarist needed that for feeling) but I listen mostly to the near fields. In my new studio I felt not even the necessity to switch on the near fields during tracking. (except bass guitar) The stereo image is really good and defined. The frequency response is much better than in the old room ... but...not perfect. There are some issues left.
