GLM with non sam system - Forum
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GLM with non sam system
cymrubeats, modified 2 Years ago.
GLM with non sam system
Youngling Posts: 2 Join Date: 6/18/18 Recent PostsHi, sorry if this has been discussed before but I have a sam glm surround system at my studio which is lined up and am very confident with. I am frequently also working with mixes from my studio at another studio, with non sam genelecs which sound very harsh - middley. Can I use glm to measure the room curve in any way to prove my theory?
lukester, modified 2 Years ago.
RE: GLM with non sam system
Jedi Master Posts: 296 Join Date: 4/22/10 Recent PostsHarshness, no. GLM doesn't do much at higher frequencies.
But it's absolutely a good idea to measure the non-sam room with your new speakers.
And find a way to apply the same correction, in hardware or on a soundcard etc.
masza, modified 2 Years ago.
RE: GLM with non sam system
Youngling Posts: 14 Join Date: 7/1/14 Recent PostsDo you have sound character profiler enabled in your studio or have you manually modified the high-shelf filters?
Anyway, GLM can't measure your non-GLM setup. Instead you need to install Room EQ Wizard and acquire a microphone for which you have a calibration file available (e.g. UMIK-1 from miniDSP).
lukester, modified 2 Years ago.
RE: GLM with non sam system
Jedi Master Posts: 296 Join Date: 4/22/10 Recent Postsmasza:
Anyway, GLM can't measure your non-GLM setup. Instead you need to install Room EQ Wizard and acquire a microphone .
Baloney. Just measure the room with GLM and transfer the values to any EQ.
I've done this twice before., no need to buy anything extra.
masza, modified 2 Years ago.
RE: GLM with non sam system
Youngling Posts: 14 Join Date: 7/1/14 Recent Postslukester:Baloney. Just measure the room with GLM and transfer the values to any EQ.I've done this twice before., no need to buy anything extra.
Why you keep sharing misinformation? OP has non-SAM Genelecs at home. Those can't be measured with GLM software. In theory OP can use the GLM microphone but it should be connected to microphone input and anyway measurements wouldn't be accurate because there would be no calibration file.
lukester, modified 2 Years ago.
RE: GLM with non sam system
Jedi Master Posts: 296 Join Date: 4/22/10 Recent Postsmasza:lukester:Baloney. Just measure the room with GLM and transfer the values to any EQ.I've done this twice before., no need to buy anything extra.
Why you keep sharing misinformation? OP has non-SAM Genelecs at home. Those can't be measured with GLM software. In theory OP can use the GLM microphone but it should be connected to microphone input and anyway measurements wouldn't be accurate because there would be no calibration file.
Why do you accuse me of misinformation instead of comprehending a fairly simple procedure?
You only need ro measure a room once, it doesn't matter how u measure it, you just need the values.
So cymrubeats can use his GLM setup and measure the other room to get the necessary EQ values.
These values you can manually transfer to any EQ you apply to souncard output -> fake GLM correction on old models
Peace Equalizer can do this on a PC, there's another option on the mac.
There's even some hacks that let you use very good VST Plugins on any soundyard output.
I've done just this with 1031s and 1037s.
masza, modified 2 Years ago.
RE: GLM with non sam system
Youngling Posts: 14 Join Date: 7/1/14 Recent PostsMeasurements are factored at least by room, speaker and the positions of speaker and measurement microphone (i.e. listening position)... If you change the speaker and/or position of it, you should re-measure.
GLM aims for best possible accuracy in the acoustics the speakers are deployed to. Your advice, though possible, is against that. It would even be better to just connect that GLM microphone to pc and measure the non-SAM models with REW.
lukester, modified 2 Years ago.
RE: GLM with non sam system
Jedi Master Posts: 296 Join Date: 4/22/10 Recent Postsmasza:It would even be better to just connect that GLM microphone to pc and measure the non-SAM models with REW.
No.
The genelec mic is cheap & very bad. But it gets measured in the factory, GLM pulls correction for the exact mic currently connected.
So don't use it in REW.
Yes, do measure at the same positions in the room and listening poition of course.
And you don't need the exact same model, just roughly the same or better frequency range.
Also you don't need to replicate GLM settings 100% correctly, the frequency is very important,
but sometimes relaxing the sharp filters that GLM suggests improves the sound. There are not many absolutes in room acoustics imho.
masza, modified 2 Years ago.
RE: GLM with non sam system
Youngling Posts: 14 Join Date: 7/1/14 Recent Postslukester:masza:It would even be better to just connect that GLM microphone to pc and measure the non-SAM models with REW.No.
The genelec mic is cheap & very bad. But it gets measured in the factory, GLM pulls correction for the exact mic currently connected.
So don't use it in REW.
Yes, do measure at the same positions in the room and listening poition of course.
And you don't need the exact same model, just roughly the same or better frequency range.
Also you don't need to replicate GLM settings 100% correctly, the frequency is very important,
but sometimes relaxing the sharp filters that GLM suggests improves the sound. There are not many absolutes in room acoustics imho.
Every mic needs calibration if you want to get the most accurate measurements. GLM mic is not an exception. With little exploring one can find the calibration file for the microphone from installation folders. For example looking at my microphone calibration data, it's inside -2 - 0 dB @ 10-3000 Hz which is not bad IMO. Ofc it depends on the microphone pre-amp also (for non-USB mics like GLM mic), GLM adapter has that one specially engineered for the GLM mic.
You may do what you want with your SAM and non-SAM Genelecs but if the best possible accuracy is the target (which I think is the case for the OP, as he/she is working in sound production), changing the speaker model invalidates the measurements. You might get some sense of room modes but still, every speaker model behaves differently in the same room. The OP even has the SAM models at the work place and non-SAM models at the other place. Quite a heavy operation to move those SAM models from work to that other place just to perform some measurements which aren't even going to be so accurate for those non-SAM models...
Would be best if cymrubeats could tell which SAM and non-SAM models he/she is using.
lukester, modified 2 Years ago.
RE: GLM with non sam system
Jedi Master Posts: 296 Join Date: 4/22/10 Recent PostsI think you're exaggerating.
Have you ever measured the same room with different GLM speakers? I have.
Swapping speakers invalidates nothing.
Maybe you've taken Genelec's marketing material too seriously, a flat frequency response is nice. RT60 is just as important. No one knows how to fill a null in a room.
So I don't think it matters much if the Q of a filter for the room response is off by 15%, if you move the speaker or yourself a bit you'll see a bigger difference.
I have 1031, 1037, 1237, 8351, 8330, work and play.
Most of my colleagues agree what set sounds best: 1037 using the correction from 8351
Just imagine my upset when i found that out *after* I bought new 1237s.
masza, modified 2 Years ago.
RE: GLM with non sam system
Youngling Posts: 14 Join Date: 7/1/14 Recent PostsHave you measured 1037 with and without the correction of 8351?
I agree it's not about the frequency response only. Decay matters also, so do many other things. But if you have big problems with decay in the lower frequencies no DSP is going to fix that when you turn up the volume.
And with GLM autocal all you get is the frequency graph.
lukester, modified 2 Years ago.
RE: GLM with non sam system
Jedi Master Posts: 296 Join Date: 4/22/10 Recent PostsYes, agreed!
I haven't measured the 1037 at all.
Had 8351 in the spot before, eyeball transferred EQ setting to 1037. Worked great.
Got 1237 for the same spot, ran GLM, same result +-10%
Kept the 1037 b/c they sound more musical.