You can follow my tips below if you want to get a good glow headphone.
1. Find out the level of impedance and other features if you want to buy earphones.
2. Test the glow headphone first before you buy it.
3. If you want to get the right glow headphone you should pay attention to the seal of the earphone. Leaking seal might cause lose bass sound.
4. You also have to burn-in the glow headphones immediately after you get it out of the box. The common time needed to burn-in earphone is around 12 hours play time. Within a week you will get the correct sound of the earphone.
5. Get the best seal that fit to your ear so you can feel comfortable while you are using it. You have to find the best position in wearing earphone because everyone has different ear canal size. So, might not find your comfortable earphone position the same with your friend's.
6. If you want to get lightning earphone replacement earpiece you can get the tips that are made of rubber or silicone. You will be able to find the replacement for earpiece easily if you lose your eyepiece rubber or silicone.
7. One ear might have different ear canal size from the other ear. You might have to get different size or eyepiece to get the fit earphone eyepiece.
8. You have to seal ear canal with eartip firmly if you want to get the best sound. Gently pull the eartip to your ear until it meets the comfortable position. You will notice the drop of ambient noise once you get the right position.
Make sure that you burnt-in the earphone and stop complaining about the flat sound of the new earphone. You have to burnt-in the earphone before you get the best result.