OT Adjusting Home cinema - equalizer

["Nikola Kasic" <nikola@xxxxxxx>]

I played yesterday with Sound Pressure Level meter and Test DVD (Ultimate DVD Platinum) and it just confirmed what I knew that my system is not reproducing signal in mid ranges so I need to increase it with built in equalizer. Amp is Sony STR-DB1070

However, my equalizer works in a way that I have to choose frequency and gain (in dB). I can choose 1 frequency in each range. Ranges are:

BASS: 99Hz - 1kHz

MID: 190Hz - 10kHz

TREBLE: 1kHz - 10kHz

Gain is distributed in bell shape (I think it's called Gauss shape, my university days are far behind me) around chosen frequency.

 

I took a measurments on 3 frequencies:

1 kHz -7dB

4 kHz -2dB

8 kHz +1.5dB

 

Now I need to flatten frequency response curve with these "bells", but I forgot how to calculate the gain (formula). How far from central frequency it falls on 75%, 50%, 25% of the value.

E.g. if I have two 2 "bells" and in the middle of them each of them falls to 50% of the value, resulting curve between them will be 100%. value because they add.

 

I hope this all makes sense.

Probably Mark can help me with this.

 

I tried with hit and miss method, but went nowhere, because those settings affect each other. I need to put on paper what I expect and then I can fine tune by measuring.

 

Nik

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