Originally Posted by luisdent
I think he's adding 6. According to this golden ears graph, it is -5db at 50hz and -10db at 20hz, but again 20hz is more felt than heard and goldenears adds 6db to "compensate" for the lack of speaker feel (the effectiveness/accuracy of this method has been widely debated). So if you don't use the 6db boost than the goldenears graph shows the er-4s to be perfectly flat all the way down to 40hz with only a 5db loss at 20hz which is the limit of hearing. That puts 30hz around 2.5db low. That's very accurate.
There's nothing wrong with that if you prefer it (I go back and forth) but accuracy-wise the non 6db boost is the most technically accurate. That doesn't mean technically accurate sounds the way you want it to. That's why they probably add the 6db to account for most people who might want that extra bass because of the lack of speaker "feel".
It's sort of like saying when you go to an IEM you're losing the feel but not the frequencies. Adding more volume in the frequencies might make you think it's more like a speaker, but it's not really adding "quality", because the feel was missing, not the frequencies.
I think we all need to remember that technical accuracy isn't the end all though. If someone doesn't like the lack of feel and really enjoys the 6db boost or more to "compensate" than more power to them if that makes them enjoy the music.
As for my tip mod. Here are the non-modded tips inserted as deep as possible.
They were already pretty deep, and I'm not sure if you can tell, but these are even deeper and sound incredible. So far no problem having the tips more exposed either...
Lastly, I've tried a butt-load of IEMs and compared as many as possible to the golden ear graphs. I find their graphs to be extremely accurate in their curve related to the actual sound of the IEM give or take the 6db rule.