Before EQ and after EQ measurements - please advise if this is correct

blackhole said:

i am changing the target DB level to 70.
So should i try different target levels until the sound is satisfactory?

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Hi,

If I understood correctly, you want to avoid any boost. You have 2 nulls at 87 and 105 Hz Therefore as a starting point, I would place the target below those nulls. Also adjust the crossover HP cutoff to match the natural slope of your RMS average. Here's an example. Lastly set the individual max boost to 0. If I made mistakes, please feel free to correct me. This would be my first 'diagnostic'.

It's probably much better to do an inversion, but that requires convolution. Are you are implementing the filters as data typed into an equalizer? Or are you using impulse responses in a convolver? I haven't used Equalizer APO in ages, but I know it can do both.

blackhole said:

Thanks. I followed your steps.Please see attached before-EQ and after-EQ photos attached.

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Hi @blackhole

You have more linearity in the highs. I would have expected a more extended bass response (you lost a lot of frequencies below 55-60Hz) as well as a significant drop in SPL but at least you flattened the peaks in the bass region to some extent. Those dips in the bass region are caused by room and cannot be equalized: changing speaker location and room treatment is required (diffusion/absorption). You could post your mdat file and I would have a look to see if everything is related in context.

If youre using EQ, please do tell; however if you're able to use convolution (inversion), @moedra has made an excellent tutorial at https://nverxion.wixsite.com/meridiansoundworks/drc-rew and this whole thread would be of interest to you: https://www.avnirvana.com/threads/convolution-room-correction-and-room-curve.14005/page-2

You haven't specified. The after curve. Is it a result of afterwards measurements or calculated / predicted?

Best regards,

blackhole said:

Thanks. I followed your steps.Please see attached before-EQ and after-EQ photos attached.

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If you do decide to follow my tutorial, my recommendation in the target design section is to place the target level somewhere between 69dB and 72dB, which is specific to your measurements. You will need to ignore the deep dip around 110Hz, which is a boundary interference null.

DanDan said:

Are you Measuring One Speaker or Both Together? https://www.irishacoustics.com/forum/measurement-and-control/acoustic-measurement-primer

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Excellent work, Sir!