First of all, I want to thank you for considering this model and for your efforts in general. I try these files on LG and Laptop. Both are different but still the same which is good.
Toneboosters Parametric EQ in USB Audio Player can use 6 or 10 bands only, noting in between.
Anyway...I prefer to use this on a PC with APO and VST plugins.
Sub-bass and soundstage are the main attraction that makes these earphones popular
When I listen HE150Pro with Zen DAC without any Gain, Bass Boost, or EQ, the low end is very dominant relative to other frequencies. Sub-bass does not require any correction. Mid-bass is a bit bloated and "cast the shadow" over lower mids. Upper mids are slightly recessed and treble is smooth (aka. laid back).
Imaging is average (the
original MX500 version has better imaging). Soundstage, another plus.
First I tried "GraphicEQ" without plugins. The whole f-curve is pushed down in comparison to the PEQ file but that is easy to fix.
For this test, I use a new song by
Toni Braxton (bass, female vocals, and electric guitar)
Bass is much more controlled now, mid-bass bloat is gone. Nice
Female vocals are cleaner and a bit more pushed in front which is a big plus but also they sound a bit thinner. Treble needs a bit more tweaking, it sounds much brighter (on PEQ file), but by no means harsh and sibilant. I'm treble sensitive so this is subjective criticism.
And you are right, EQ strength between 40% to 75% for sure.
Then I tried PEQ files with
ProQ which do average curve between points and
apQualizr.
I lowered a few dB at 20Hz, 1K, and 8K and that's all. Thanks again man and keep up the good work.
BTW...can you post Freq. Graf of original tuning for HE150Pro?