FuelMan
Head-Fier
Proper EQ adjustments can yield great value and allow for compensation of IEM signatures found to be lacking; keeping in mind that "less is more" in most situations. Just hard to compensate for a horrible signature but it works well for those sets you'd like to "ever so slightly" reduce or increase presence of a certain part of the spectrum. And depending on the area, if you're lucky, a graphic EQ will have a band close to the area of adjustment needed so you don't have to destroy neighboring frequencies, as @kmmbd mentions above. In theory (but no hard and fast rule here) a "tighter" Q-factor is best for cutting while a slightly larger Q works well for adding signal, at least this is a common rule for production, but again, depending on the AMOUNT of adjustment needed, these rules might need to be trashed for any given situation.10-band EQ can't quite substitute PEQ and often turns out a bit extreme for some headphones/IEMs. The Q-factor basically allows you fine tune the range of the hump/dip (as usually you don't have a sudden spike in a specific frequency point, rather a gradual rise/dip and Q-factor determines how gradual/steep that change would be).
I often use EQApo on Windows and it's immensely helpful in many cases e.g. the SHP9500 with a good PEQ preset is immensely enjoyable, same applies to the Tin T4 which with oratory1990's preset has all it's peaky issues resolved. I wish Android had some system-wide support by default without having to go through third-party apps or Magisk modules.
I find the "pseudo" PEQ on my Hiby R5 to perform a very unique and effective adjustment. They call it the "MSEB Tuner" and it uses PEQ & algorithms. It presents itself in a manner that doesn't require the detailed understanding of PEQ; it's interface is constructed in a way that allows the user to make adjustments relative to the outcome rather than a specific frequency. Initially I thought I would rather have a straight-forward PEQ but after a few weeks of working with it, I find it extremely useful, especially to compensate for poor production quality. Below is the layout and TBH, IMHO this Hiby R5 appears to be offering EXTREME VALUE for $299! Especially for streaming with the "8.1 Open Android" OS!
Screen 1
Screen 2
* I have no clue as to why the text on some lines is overlapping. I need to get with MuiscTek or Hiby since this is a new unit less than 3 weeks old. Hopefully they can resolve this. Pretty sure I'm on the latest firmware.
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