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8240a calibration question

asymetric, modified 8 Years ago.

8240a calibration question

Youngling Posts: 8 Join Date: 6/18/14 Recent Posts
Hey,
I just got brand new pair of 8240a with GLM.
After GLM automatic callibration I've got that:
https://www.dropbox.com/s/6nh5nbwrpcouptb/BASIC.jpg
As you can see in the picture, there is a low curve on high frequencies.
After that i do some shelve on HF and i've got that:
https://www.dropbox.com/s/kw02p1bpmmry4ej/%2B%2B%2B.jpg
My question is: Which one is most appropriate for monitoring?
I'm asking becouse it is strange that GLM has not changed deficiencies on the high-frequency band.
I'm looking forward for some solution.
Faithfully, Artur
bourne, modified 8 Years ago.

Re: 8240a calibration question

Padawan Posts: 74 Join Date: 2/26/14 Recent Posts
The GML autocorrect feature does not touch frequencies above a certain threshold, I think it is 1.000 Hz.

Edit: as stated below, it is 2.000 Hz!
asymetric, modified 8 Years ago.

Re: 8240a calibration question

Youngling Posts: 8 Join Date: 6/18/14 Recent Posts
Good to know.. but.. is it good to get " reference sound" by "flating" the curve of room freq. response as I do? :?:
ilkka-rissanen, modified 8 Years ago.

Re: 8240a calibration question

Yoda Posts: 2564 Join Date: 3/23/09 Recent Posts
Hi Arthur,

I would go forward with the first calibration, without using the shelving filter to boost the highs. This is because, as written next to the frequency response box, the response above ~6 kHz can be affected by various factors including the distance from the loudspeaker to the microphone, aiming of the loudspeaker etc. It should also be noted that no automatic optimization occurs above 2 kHz.
asymetric, modified 8 Years ago.

Re: 8240a calibration question

Youngling Posts: 8 Join Date: 6/18/14 Recent Posts
Hey,
Ikka, at the beggining thanks for response and your tip.
However, I would like to point out that the microphone was positioned perfectly at the milimitera. I would like to have a maximum reference sound in his studio ( the reason why i bought Genelec speakres), and that in the upper frequencies (> 6 kHz) reaching -4dB (even -5dB >17,5kHz) will not be a problem in "reference hearing"?
Best, Artur.