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Be aware that these won't sound great through a regular smartphone headphone jack.
Reason: Impedance of multi-driver IEMs isn't linear, and typically 3+ driver units have values that vary wildly. Through a smartphone, the highs are attenuated considerably. This is not an issue with portable DAPs that have <=0.5 ohms output impedance.
Can you recommend one under 75$?
Look for dynamic drivers - they don't have this reactive nature of BA IEMs. Even single BAs.
That's a little misleading given that many smartphones have a relatively low output impedance. iPhone 4: ~1 ohm, iPhone 5 ~3 ohm, iPhone 6/6s and Galaxy s7 ~5 ohm. That's not to say that using another source wouldn't be better, but based on the numbers here https://rinchoi.blogspot.com.au/2014/03/nuforce-primo-8-firstborn.html, you would probably only see around a 3db reduction even from 5 ohm output impedance.
According to this graph:
The impedance goes down to around 6 ohms in the treble, which is already muted. The standard I keep hearing about is to have your output impedance be 1/8 of the total impedance. Even 1 ohm is far too much.
Well I guess whether or not a <3db reduction in treble is "far too much" depends on your preference. I personally am happy using them straight from my G5's headphone out, as well as from my dragonfly.