rasmushorn
Headphoneus Supremus
Received - plugged in and playing! No tone or hiss at all with my SR325i.
And replytoken, do you mean this one? ER4P-24 (http://www.etymotic.com/ephp/er4-acc.aspx) That's also a bit too expensive too...
Cable : Converts ER-4P to ER-4S
BUY NOW - $65.00 Each
You can make your own impedance adapter for about $10 ($20 if you use good parts). I've made a few for myself and some local guys.
While one might theoretize about a bad batch or something, in fact as far as I can see no-one here has reported NOT hearing the tone with headphones of low impedance (say, under 32 ohm) and high sensitivity. I checked that some of the in-ears people were not having the noise with actually had impedances around 40-50 ohms.
Strange - my uDAC-2 doesn't hiss even with my most sensitive IEM (ES3X, W3, etc) that hiss on other amps. And my IE8 did not hiss with my noisiest amp that hisses noticeably with my most sensitive IEM (ALO Amphora and AMP3). I've never felt the IE8 were a hissy IEM. I suspect there is a problem with the uDAC-2 and it should be okay after you have it replaced.
While one might theoretize about a bad batch or something, in fact as far as I can see no-one here has reported NOT hearing the tone with headphones of low impedance (say, under 32 ohm) and high sensitivity. I checked that some of the in-ears people were not having the noise with actually had impedances around 40-50 ohms.
I'm hearing the tone/noise on three different devices with 2 phones and 2 cables
Let's all try to answer this list and maybe we can conclude something:
1. Can you hear the tone? ( if no, jump to question 9)
2. Is the tone louder than the background hiss? (a feel for how loud it is)
3. Does the tone change volume with the volume knob turning?
4. Estimate the frequency of the tone
5. Does the tone frequency change with different headphones?
6. Try different usb ports on the computer, does the tone change volume or frequency or is it identical on every port?
7. Does the tone occur anytime the udac2 is plugged in and on, whether it's playing anything or not?
8. Is there a tone if you plug it into a usb charger or hub without being connected to a computer?
9. List the computer(s) it is connected to and if any hub or extension cable is in between.
10. List the usb cable you are using it with.
11. List the headphones you hear and don't hear it with.
Let's all try to answer this list and maybe we can conclude something:
1. Can you hear the tone? ( if no, jump to question 9)
2. Is the tone louder than the background hiss? (a feel for how loud it is)
3. Does the tone change volume with the volume knob turning?
4. Estimate the frequency of the tone
5. Does the tone frequency change with different headphones?
6. Try different usb ports on the computer, does the tone change volume or frequency or is it identical on every port?
7. Does the tone occur anytime the udac2 is plugged in and on, whether it's playing anything or not?
8. Is there a tone if you plug it into a usb charger or hub without being connected to a computer?
9. List the computer(s) it is connected to and if any hub or extension cable is in between.
10. List the usb cable you are using it with.
11. List the headphones you hear and don't hear it with.
Let's all try to answer this list and maybe we can conclude something:
1. Can you hear the tone? ( if no, jump to question 9)
2. Is the tone louder than the background hiss? (a feel for how loud it is)
3. Does the tone change volume with the volume knob turning?
4. Estimate the frequency of the tone
5. Does the tone frequency change with different headphones?
6. Try different usb ports on the computer, does the tone change volume or frequency or is it identical on every port?
7. Does the tone occur anytime the udac2 is plugged in and on, whether it's playing anything or not?
8. Is there a tone if you plug it into a usb charger or hub without being connected to a computer?
9. List the computer(s) it is connected to and if any hub or extension cable is in between.
10. List the usb cable you are using it with.
11. List the headphones you hear and don't hear it with.