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The ER4S sounds awesome, but really needed some extra power. Using it with iPod headphone out is really not the best idea. IMO the RE0 and the ER4 are on the same tier, just difference in different area. The RE0 have far better impact and the ER4's bass impact is not spectacular. Still using my modded TF10 which have a slightly more impactful bass. Oh yes, if you love soundstage ER4 is great for it, where many other IEMs lacks it. If you have a good source and source file ER-4S is totally recommended, but just to say its not what most people new to hifi expects, its not bassy and punchy.
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