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Originally Posted by Punnisher  Most portable players have too much hiss for sensitive iems like the westone um2 and other low impedance/high sensitivity earphones.
Many amps have a very low noise floor which is a great thing for iem use.
It's unfortunate that amps are needed for some earphones. In my opinion, all iems should be over 100 ohms or be designed with low sensitivity to make amplifiers optional.
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I wonder if the Westones need such a high sensitivity for some technical reason or if they could have been designed either with a higher impedance or lower sensitivity. Still not sure exactly how those two measurements relate to the output SPL, I mean quantitatively.
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Originally Posted by MrGreen There aren't enough options on the poll.
Although not completely black, I find that hiss becomes inaudible (i.e. < 0 dB) with ER4P (and even moreso with ER4S eidit: woops bad english. I mean I can turn it to higher levels with the S without hiss on blank tracks) when listening at 1 tick up from mute (which is loud enough for me).
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MrGreen, I'm not sure I follow. I'm failing in reading comprehension!
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Originally Posted by Punnisher The Tomahawk has a very clean output and does not hiss with the UM2 (which I believe is one of the most sensitive earphones around).
The player that has the least amount of hiss is the ipod classic, though that hardly matters because the volume doesn't go low enough. The lowest tick is too loud with the UM2.
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I vaguely remember this when I had my Tomahawk and the ER-4p, but the ER-4p also did not hiss terribly from the iPod out, if I recall correctly. And anyway, the impedance adapter always was an option that helped and did not hurt the ER-4 sound. But if the UM2 does not hiss with the Tomahawk, I might have to revisit the Tomahawk soon. Here's to hoping my forthcoming Shadow doesn't hiss.
