8/16/2023 0 Comments Blue binaural microphone![]() Keep in mind this is a graph for one driver, often the EQ you apply to one driver won't match the other one exactly enough. There's a lot going on in this graph, but you can see the light blue shaded part is your EQ, the dark red line is the original response, and the light red line is your predicted response after EQ. You can add as many filters as you want to EqualizerAPO, as far as I know. I had to use almost all 20 filters to get my desired response, but that shouldn't be a problem if you are using EqualizerAPO, which REW can output directly into. Under EQ filters, you want to try and match the frequency response to your desired curve. I find the default curve to work well for me tonally. On that page, you can customize the target curve to whatever you want. Once you have completed measuring both drivers, Click on the EQ button on the top right. I do not hear that large of a dip at 11-12 Khz, could be that the mics are placed right at the ear canal and not inside of the ear canal, where resonance can occur. Anything above 10 Khz take with a grain of salt, because often the graphs do not represent what you hear in that area. Due to pad wear and my irregular shaped head, my HD650s are not nearly as well matched in the mids. These measurements confirm how well matched the drivers are. For now, don't worry about the dips and focus on the peaks. There is a dip at 6.8 Khz, which may be the result of the shape of my ears, as it is also present with the HD650. No smoothing may be more accurate, but looks uglier.Īnyway, there is a peak around 5.5 Khz, and 8-10 Khz. Also, I set these graphs to have 1/24 octave smoothing, which you can adjust by clicking on the gear at the top right corner of the graph. That stuff at the bottom is phase response, which I have no knowledge about. Here are the measurements of the left and right drivers of the Beyer DT880 respectively. Don't record both at the same time, or you will have one driver affecting the measurements of the other. Make sure under Preferences you have the left mic recording the left driver, and the right recording the right. Make sure the binaural mics are not loose inside your ears, because their position can affect the frequency a lot. Make sure you test the tone at comfortable normal listening levels, the same level you would listen to music. I use my headphone amp to adjust the levels, but you can increase or decrease the mic sensitivity to get the required levels. Levels around -15 dB work the best, and give room for peaks to be measured without clipping the microphone. The software automatically gives you a frequency chart after the measurement is complete.Ĭheck levels before you measure. Using Room EQ Wizard, I measure one earcup at a time, with a 10-20,000 Hz sine wave. I don't claim to know everything about audio science and frequency measurements as a whole, I just know this following method works very well for me, and I want to share this method so others can try it out. ![]() With it, the peaks of the DT880 are gone, and the treble performance of the HD650 is better, with the option of removing the mid-bass hump. With this method, I have equalized the sound of these two headphones to sound extremely similar, following a typical speaker target curve within the Room EQ Wizard software. So far, I have tested this way of equalizing with the Sennheiser HD650, and the Beyerdynamic DT880. As a result, the frequency response measurements you see everywhere do not match what your ears are hearing, sometimes the differences are very large, especially above 5 Khz. All measurements you see online use some sort of artificial dummy head device with ears that do not match exactly your own ear shape. However, I have found that this method makes my over ear headphones sound better. Let me say first that this may be a very unorthodox way of measuring and adjusting headphone frequency response using EQ. I use these microphones with the Zoom H1 recorder. They create very good binaural recordings, and work very well for other purposes just like what I am about to show you. I am using these microphones from the Sound Professionals: . I want to share with everyone what I've been experimenting with, which is measuring headphones using in ear binaural microphones and correcting the frequency response with EQ. Since what I am doing requires a computer and software, I thought I should post it here. ![]() I'm not sure where to post anything EQ related, as there are multiple EQ threads in many different places.
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