# Frequencies
Highs: Above 6k
Mids: 250-6k
Bass: 60-250
Subbass: 20-80
# EQ Settings
## 10-band settings for Shanling M3s
| Range | Hz | iSine | iS. BB | SE425 | BB | 800 | IT01 | IT01-b | ZSR | ZSR-b | Frequency Vocab Notes |
|:---------- |:--- |:----- |:------ |:----- |:---- |:---- |:---- |:------ |:---- |:----- |:------------------------- |
| Subbass | 31 | 0db | 5db | 0db | 5db | | 1db | 6db | 5db | 4db | |
| Bass | 62 | -1db | 4db | 2db | 3db | | 3db | 4db | 3db | 2db | |
| Bass | 125 | -3db | 4db | 2db | 0db | | 0db | -2db | 1db | -1db | |
| Lower Mids | 250 | -6db | -6db | 4db | -4db | 3db | 3db | 4db | 5db | 5db | "Warmth"[^1] |
| Lower Mids | 500 | -6db | -6db | 0db | -6db | | 0db | 0db | 0db | 2db | "honky" or "nasal" [^2] |
| Lower Mids | 1k | -5db | -5db | 4db | -4db | 3db | 3db | 4db | 5db | 5db | Vocal "Warmth" [^1] |
| Upper mids | 2k | -1db | -1db | 0db | -6db | | 0db | 0db | 0db | 2db | |
| Upper mids | 4k | 4db | 4db | 0db | -6db | -3db | -3db | -3db | -1db | 0db | "Vocal presence" |
| Highs | 8k | -2db | -2db | -4db | -4db | -5db | -4db | -4db | -2db | -2db | Sparkle/sibilance/fatigue |
| Highs | 16k | -2db | -2db | 2db | -4db | | 0db | -2db | -2db | -2db | "Air"[^1] |
## 10-band settings for Onkyo DP-S1
| Range | Hz | iSine | Bass | IT01/ZSR | Lefty W |
|------------|-----|-------|-------|----------|---------|
| Subbass | 32 | 0 | 12 | 3.5 | 12 |
| Bass | 63 | -1 | -2 | 2.5 | 2 |
| Bass | 125 | -3 | -10.5 | 0 | -10 |
| Lower Mids | 250 | -6 | -7.5 | 4.5 | -7.5 |
| Lower Mids | 500 | -6 | -9 | 1 | -10 |
| Lower Mids | 1k | -5 | -8 | 4.5 | -7.5 |
| Upper Mids | 2k | -1 | -10 | 1 | -10 |
| Upper Mids | 4k | 5 | -9.5 | 0 | -11 |
| Highs | 8k | -2 | -10 | -2 | |
| Highs | 16k | -2 | -9 | -1 | |
## 10-band settings for ES100
| Range | Hz | GT3 |
|------------|------|-----|
| Subbass | 31.5 | 3 |
| Bass | 63 | 3 |
| Bass | 125 | 0 |
| Lower Mids | 250 | 0 |
| Lower Mids | 500 | 0 |
| Lower Mids | 1k | 0 |
| Upper Mids | 2k | 2.2 |
| Upper Mids | 4k | 0 |
| Highs | 8k | 1.4 |
| Highs | 16k | 4.9 |
## 2021 Equalizer APO Settings
| Range | Hz | EE Bravado | GT3 |
| ---------- | ----- | ---------- | ---- |
| Subbass | 20 | +10 | +15 |
| Subbass | 25 | +9 | +12 |
| Subbass | 31.5 | +6 | +10 |
| Subbass | 40 | | +9 |
| Subbass | 50 | | +7.5 |
| Bass | 63 | | +5 |
| Bass | 80 | | +3 |
| Bass | 100 | | +2 |
| Bass | 125 | | |
| Bass | 160 | -1.5 | |
| Lower Mids | 200 | -1.5 | |
| Lower Mids | 250 | -1.5 | |
| Lower Mids | 315 | -1.5 | |
| Lower Mids | 400 | | |
| Lower Mids | 500 | | |
| Lower Mids | 630 | | |
| Lower Mids | 800 | | |
| Lower Mids | 1k | | |
| Lower Mids | 1.25k | | |
| Lower Mids | 1.6k | | +1.8 |
| Upper Mids | 2k | 0 | +2.3 |
| Upper Mids | 2.5k | +2 | +1.6 |
| Upper Mids | 3.15k | +5 | +0.5 |
| Upper Mids | 4k | 0 | |
| Upper Mids | 5k | -2 | |
| Highs | 6.3k | -2 | |
| Highs | 8k | 0 | +1.5 |
| Highs | 10k | +5 | +1.6 |
| Highs | 12.5k | +5 | +3.3 |
| Highs | 16k | 0 | +5 |
| Highs | 20k | 0 | +5 |
# EQ Notes:
- Bravado on Hiby R5 Gen 2 -- tone down the 10-12k bump and 3-4k bump from +5 to more like +2
* ZSR need to cut both 8k and 16k for sibilance
* Don't bother bumping SE425's subbass, it hasn't any
* IT01 is good either with a tasteful mild bump to bass and cut to 4k & 8k or with crass 10db+/-2db bass boast
* I seem to want everything, generally speaking, to be boosted at 250hz and 1khz. (At least on the M3s.)
* I tweaked the values on the Onkyo iSine settings to more closely (by eye) match the official EQ curves from KMann ^089123
* For the GT3 Superbass, boosting the subbass is always hilarious; also experimenting with cutting 4k and increasing circa 10k
* Alternate possible EQ for the Superbass: increase 1k up to just below 4k, centering between 2k and 3k w/max +7db. Also increase 10k-13k by as much as 10db. This would be to try to approximate iSine Cipher tuning.
[^1]: https://www.reddit.com/r/explainlikeimfive/comments/1ogr7o/eli5_how_to_correctly_use_an_equalizer/
[^2]: https://www.head-fi.org/articles/glossary-of-terms.13562/
# Target Response Curve
From [Inner Fidelity][Inner Fidelity]:
> +4dB rise in the bass, starting no higher than 200Hz and at full level by 60Hz.
> From 200Hz to just over 1kHz, you should have a gentle 3dB rise.
> The main peak of the plot should be at 3kHz +/-500Hz ideally. If the peak starts getting too high in frequency the sound can get quite piercing in nature.
> Although the curve can get fairly noisy above 3kHz, it should generally follow the profile shown and be roughly back to 0dB at 10kHz. And a less noisy frequency response curve is generally better sounding.
> Above 20kHz the plot should continue to fall off to about -13dB below baseline.
[Inner Fidelity]: https://www.innerfidelity.com/content/headphone-measurements-explained-frequency-response-part-two#v2Ed3dRR6AmlHJOT.99
60 +4db
200 0db
1.2k 3db
3k 12db
10k 0db
20k -13db
# Hearing Loss / Tinnitus Compensation
![[Pasted image 20221207215423.png]]
## Equalizer APO Peaking Filters:
| Channel | Frequency | Gain | Q Factor |
| ------- | --------- | ------ | -------- |
| Left | 7khz | 9db | 8 |
| Left | 6.2khz | 8db | 10 |
| Right | 6.5khz | 4-5db? | 10 |
During the course of diagnosing a channel balance issue with one of my amps, I checked to make sure it wasn't just my ears -- and it wasn't, in that case, but I did detect an issue with my left ear in the vicinity of 7k.
Some experimentation with the Math EQ plugin for Foobar helped isolate it and surfaced a couple of other issues, one more in the left ear and one in the right ear. I was able to set up some basic parametric EQ to correct for this, and so far it does seem to be providing a noticeable improvement on some tracks. I'm sure I'm doing it wrong, still. I'm particularly not sure about the gain and Q factor settings for 6.5khz boost to the right ear.
This presents an additional layer of complication on EQ when using DAPs, because even the ridiculously overbuilt nightmare software that is Poweramp does not support separate EQ for the left and right channels, and the same seems to be true of most Android audio apps. [Hiby has a system-level convolution plugin](https://www.head-fi.org/threads/r5-a-new-android-dap-by-hiby.912566/page-209#post-15892903) that I will probably need to look into. Convolution should support literally any EQ desired -- I just have no idea how to generate the needed WAV file.
#list