Spatializer / Wide Stereo / 3D sound app needed for iPhone
On my Mac I have installed the audio equalizer/enhancer app Boom 2, which offers a truly phantastic spatial/3D sound, if one drives relatively small bluetooth speakers. Not exactly for audiophile listening, but just for a lot of audio fun.
Now I'm looking for something similar for the iPhone. Some apps I have already tested:
a) Stereophonic - Equalizer & 3D Sound, which is close to garbage,
b) Audio-3D Player 7.1 appears no longer available, only in an expensive (13 USD) video player variant,
c) CanOpener is reasonable, but by far cannot match the spatial sound effects of Boom 2.
Does anybody know something else, which I should look at? Thank you.