[Android Software Development] Spiricore:
I'm back with a new profile for bass-heavy listening devices, this time with FX and xHiFi side-by-side on KitKat 4.4.2 on my Galaxy S4. Thanks to [MENTION=5014976]jmxc23[/MENTION] for mentioning compatibility which is what inspired this setup. This one isn't as hands-free as the last one I posted, but I've narrowed it down to 2-3 settings to mess with so it's not high maintenance by any means (as long as your collection is ReplayGained).

Notes:

xHiFi must be made a system app to work properly on 4.4.2 in my experience. I leave FX as a user app.

Also be sure your build.prop settings are correct according to the official thread (lpa.decode).

This setup can be a little brutal in the highs depending on the recording (especially with metal), but I've been happy with every other genre I've passed through it so far. Be careful with mass shuffling, and have you finger ready on the volume control until you figure out what works for you. See below for what I do.

Settings to alter depending on the recording quality and genre:

FX:

Enabling Headphone Surround+ adds a nice boost to older recordings or anything needing some more mids/highs. I normally keep it off, but there have been a few songs/genres that it made a huge difference with; hip-hop and reggae being pretty consistent.

ViPER Clarity level gets the most mileage per tweak per track. If the highs are too harsh, try bumping this down first (assuming Headphone Surround is already off). I normally keep it at 13, but if a metal or poorly mixed track gets throw into shuffle I'll scramble to bump it down to 10 or 8 dB and it's good.

xHiFi:

Enable/Disable Firequalizer. This will take any rough edges off regardless of what range you're having a problem with or conversely sweeten up your audio a bit. I will toggle this depending on my hearing sensitivity and headache level at any given time; if you start getting ear fatigue or the highs are just too harsh in general, tweak the levels or just disable it.

1. MASTER POWER: ✔

Force Enable V4A ✘

2. Playback Gain Control: ✘

3. FIREQUALIZER: ✔

Select Preset: Custom (see attached screenshot)

4. CONVOLVER: ✔

Impulse Response: SPL TubeVitalizer Impulse Tight High LCFilter.irs

Cross Chanel: 0 percent

5. Field Surround: ✘

6. Differential Surround: ✘

7. HEADPHONE SURROUND +: (see notes above)

Effect Level: Level 1

8. Reverberation: ✘

9. DYNAMIC SYSTEM: ✔

Select Listening Device: Common Earphone (v2)

Select Dynamic Bass: 12-16 Percent

10. Tube Simulator (6N1J): ✘

11. FIDELITY CONTROL: ✔

Enable ViPER Bass: ✔

Select Bass Mode: Pure Bass+

Select Bass Frequency: 78 Hz

Select Bass Boost: 8.0 dB

Enable ViPER Clarity: ✔

Select Clarity Mode: XHiFi

Select Clarity: 10-13.0 dB

12. AUDITORY SYSTEM PROTECTION: ✔

Select Binaural Level: Extreme

13. MASTER GATE (Limiter)

Output Gain: -10.5 dB

Channel Pan: 0.5, 0.5

Limit Threshold: -1.9 db

XHIFI:

1. MASTER POWER: ✔

2. Playback Gain Control: ✘

3. FIREQUALIZER: (see notes above)

Select Preset: Custom (See second attached screenshot)

4. AUDIO RECONSTRUCTION: ✔

Hi Clarity: 35-50

Lo Contour: 30-35

5. MASTER GATE (LIMITER)

Output Gain: -4.4 dB

Limit Threshold: -1.0 dB