I'm also still trying to master getting the upper treble (10-20Kz) settled more quickly and accurately. Bass is still tricky because it's not as easy to determine what is artificially boosted compared to a noisy treble. It has helped me get a clean and non-muddy mid range faster and more accurately. For example, I recently took a closer look at mixing upper mids based on a vocal track in a well-mixed pop song rather than listening to a song overall. I still discover things about how I can approach EQing every time I take another go at a new pair. The overall theme is turning a V-shaped dynamic driver into a neutral-sounding one. This is a thread I'm setting aside for the EQ's I've made in Equalizer APO with various earphones. ![]() All EQs are intended for use with Equalizer APO, which is a powerful system-wide low latency audio enhancer for Windows. Newer revisions are not necessarily better, but usually just different. The best approach is to test multiple and hone in on the sound you want, then make small adjustments based on your own HRTF and preferences. There are many EQ revisions for each headphone. They sound slightly less bassy with my Hibi FC3 which I'm now using instead at my desktop for headphones, but even then, I don't recommend the SHP9500's if you want light bass without an EQ. I bought a second SHP9500 and they sound about the same, so it is likely an output impedance issue. Even with a good amp with zero output impedance they are still a warmer than expected, which still doesn't make sense considering their frequency response is supposed to be like the HD 600. This is a real problem for some headphones with uneven impedance curves and could explain why I thought the SHP9500s were having issues and why they sounded bassier than I expected based on online measurements. I have switched from using the front panel out to now using the HiBy FC3 for headphones and the Omega Fenix for its integrated I/O. The Audioengine D3 has a slightly high output impedance which will also have a small effect on the EQs with the "Audioengine D3" label, but not much of an effect on the ER4PT since those earphones have a higher input impedance which matches well with higher output impedance levels. Everything with the "Realtek HD" label were made with a low impedance laptop output. This didn't affect most of my EQs as I only used my desktop front panel out for some of my Philips SHP9500 EQs and briefly for my Sony MDR7506. ![]() I recently discovered the output impedance of my front panel 3.5mm is very high, causing any headphone's impedance curve to magnify its shape onto the frequency response.
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