Share your in-room measurements?

[thefsb]

Would it be useful to have a forum thread where we can gather people's in-room frequency response measurements and discuss them? Those who did something to improve their sound based on measurements might also describe what they did and show the results. I think this could be quite interesting. What do you think?

 

[Sancus]

This thread should really be in the other forum: https://www.audiosciencereview.com/...-acoustics-and-general-speaker-discussions.9/

I've noticed that this one, which is really supposed to be for speaker reviews/measurements and discussion of those specifically has been accumulating a lot of off-topic threads.

Maybe something for @Thomas savage -- I dunno. Or maybe we really only need one forum for speaker/room talk.

 

[Thomas Savage]

I don't know but a thread where everyone shares their in room measurements will be good and this can be it.

 

[QMuse]

Ok, let's start. Uncorrected, measured at LP, 4 meters from speakers, MMM RTA with pink noise, 1/6 smoothing:

Same, but corrected actual response:

 

[Blumlein 88]

Just because it is what I have handy to display. Here is the uncorrected result for LSR305's when I was using them for front speakers in my video system. Never corrected them as it was a temporary arrangement. Red is at the LP, and green is a 6 position average for a square meter around the LP. 1/6th smoothing.

Maybe we should discuss which type of smoothing to use. I think 1/6th is generally good to more or less equal what our ears hear and showing a useful amount of detail. Though perhaps psychoacoustic in REW is even better. I wonder about the psychoacoustic smoothing in REW below 200 hz however.

 

[QMuse]

Just because it is what I have handy to display. Here is the uncorrected result for LSR305's when I was using them for front speakers in my video system. Never corrected them as it was a temporary arrangement. Red is at the LP, and green is a 9 position average for a square meter around the LP.

Did I have a glass of wine too much or something is missing here?

 

[Blumlein 88]

Here is the average with psychoacoustic in orange and 1/6th smoothing in green.

Here is the same comparison with only the LP measurement. Looks like spatial averaging gets you very close to psychoacoustic smoothing. While single point measurements are more different between 1/6th and psychacoustic smoothing. Psychoacoustic is blue, and 1/6 th is red.

 

[QMuse]

Just because it is what I have handy to display. Here is the uncorrected result for LSR305's when I was using them for front speakers in my video system. Never corrected them as it was a temporary arrangement. Red is at the LP, and green is a 9 position average for a square meter around the LP. 1/6th smoothing.

Maybe we should discuss which type of smoothing to use. I think 1/6th is generally good to more or less equal what our ears hear and showing a useful amount of detail. Though perhaps psychoacoustic in REW is even better. I wonder about the psychoacoustic smoothing in REW below 200 hz however.

View attachment 64845

This is very impressive for uncorrected response - you must have a really "calm" room.

 

[Voo]

here is an uncorrected avg but with subs. focal 948. and the l/r at 1/6

 

[Blumlein 88]

This is very impressive for uncorrected response - you must have a really "calm" room.

The room is a little too reflective, but is large. It is 19.5 ft wide (5.9 m) , 33.3 ft long (10.1) and 10 ft. (3 m) ceiling.

 

[QMuse]

The room is a little too reflective, but is large. It is 19.5 ft wide (5.9 m) , 33.3 ft long (10.1) and 10 ft. (3 m) ceiling.

Too reflective?!? You should see mine - it is 5m * 8.5m, but much more "lively" than yours. Still sounds good though.

 

[Blumlein 88]

This might be worth showing. Orange is the 6 measurement average around the LP, and cyan is the single point sweep at the LP. Both are un-smoothed. You can see just how much smoothing of the numerous reflections gets filtered out by doing measurements in several locations. I've not done much MMM yet, I would think they'd smooth it out even more.

And here is the spatial average measurement without smoothing in orange and with pscyhoacoustic smoothing in blue.

Still seems incredible magic we can do such analysis with free software, a $100 microphone and a computer.

EDIT: to fix having the wrong screenshots shown. Correct shots are there now.

 

[Voo]

and maggie lrs not optimally placed yet....

 

[Duckeenie]

My speakers are desk mounted and sandwiched between two bookcases. I should probably stick to headphone listening really. Oddly enough to my ears the system sounds a little bright. Measurements don't support that though. This hobby will drive you mad if you let it.

Haven't managed to find a correction I can live with yet. I don't know whether I just got used to the sound as is or what I hear isn't what the Mic hears.

 

[Daverz]

Vandersteen Quatros (original cloth version) with the subwoofer level and all 11 EQ pots set to the zero position, 1/6 octave smoothing:

Then with REW rePhase EQ applied up to 200 Hz. (Not shown: I cranked up the subwoofer level to make the dip between 100 and 200 Hz easier to fill in.)

 

[Matias]

Before and after the PEQ in the window.

 

[thefsb]

Ok, let's start. Uncorrected, measured at LP, 4 meters from speakers, MMM RTA with pink noise, 1/6 smoothing:

View attachment 64841

Same, but corrected actual response:

View attachment 64842

Oh my!

Corrected how? And any subjective remarks. (Understood that blind ABX may not be practicable.)

 

[spacevector]

Here are mine. I am yet to get these sounding good in the room.

 

[thefsb]

Vandersteen Quatros (original cloth version) with the subwoofer level and all 11 EQ pots set to the zero position, 1/6 octave smoothing:

View attachment 64864

Then with REW rePhase EQ applied up to 200 Hz. (Not shown: I cranked up the subwoofer level to make the dip between 100 and 200 Hz easier to fill in.)

View attachment 64865

Impressive. I'd be interested to know how well this kind of correction works over a range of listening positions.

 

[thefsb]

I don't know no but a thread where everyone shares their in room measurements will be good and this can be it.

Oh boy. Buying a mic and learning to use REW and making good repeatable measurements and understanding the data and doing something about it... this is not going to be a distraction from my guitar practice, is it?