CALCULATING TARGET LEVEL

farith · Apr 19, 2019

Hello everyone, I am new in the forum and I would like to ask some questions maybe can help me to improve. I am currently working on my new studio. Dimensions 14 ft by 18ft about 8 ft height. The reference point based on my calculation of the 38% rule of my room is about 5ft from the speakers and about 4 ft from the floor. I am using acoustics panels to correct and improved the room as well. So let me explain, I am currently using MiniDSP, Saffire Pro 40, Mac tower pc. So I did room measurements with Room EQ Wizard and here are the results of my HS8 and E66 Speakers. So I am trying to create the filters to make them sound as flat as possible in the room that I am working on. I would like to ask how you guys are calculating the "target level" for your speakers. I am sure that Room Eq Wizard offers "match the level." But I am not sure if it will be the correct option. I can tell the improvement on the E66 for sure. But I am skeptical about the HS8.

Looking forward to seeing the response.

Wayne A. Pflughaupt · Apr 19, 2019

For starters, you need to re-scale your graphs for something like 45-105 dB vertical. A 400 dB span will make response that's ragged as the Grand Canyon look as flat as a Kansas prairie.

Regards,
Wayne

farith · Apr 21, 2019

Thank you. Yeah, I can lower the scale for sure. My default target level by REW is about 100db which I think its kinda high. I am also using MiniDSP for the processing so I am creating the EQ filters in a file and exporting to MiniDSP Software. How do you usually set your filters?

John Mulcahy · Apr 22, 2019

Although the level in you graphs is far too high (if it is the actual SPL) Wayne was referring to the span of your graphs. The difference between the top of the graph and the bottom of the graph should be around 60 dB for this kind of measurement, you can set the values using the Limits button at the top right of the graph or zoom in using the magnifier button that appears inside the top left corner of the graph when your cursor is on the graph.

Ultrasonic · Apr 24, 2019

Are you thinking of applying EQ across the full frequency range? Doing so on in-room measurements isn't generally a good idea, and won't achieve the result that you want.

The in-room measurement at a listening position is the sum of the direct signal from the speakers and all of the reflected signals from the room boundaries. At low frequencies the room modes dominate and EQ is a good idea. At higher frequencies it is generally a bad idea to apply EQ since you will corrupt the frequency response of the direct signal, such that if your speakers had a decently flat on-axis response you will mess this up.

This video is worth a watch if you have some time:

(There is also the more technical issue of higher frequency in-room response peaks not being minimum phase.)

CALCULATING TARGET LEVEL

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