phalanger
100+ Head-Fier
- Joined
- Apr 2, 2007
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I haven't been reading along these boards much lately so it's possible that the information in this post is common knowledge to everyone here, in that case, just ignore and/or delete the post and excuse me please
This is about how i got 100% noisefree audio output from laptop through my E-MU 0404 USB soundcard.
Lately I've been doing some home recording and noticed that even though under normal circumstances the sound was just fine, but when not playing any music and the amp volume on full, I got audible static, clearly produced by the laptop (lcd screen, harddrive). After looking around some I found the suggestion of *not* using the notebooks powersupply plugs grounding. In other words convert the 3 prong connector to a nongrounded 2 prong one.
The result of this was very good, the display and harddrive feedback were gone, 95% of the noise was. But when turning the amp to 80% or more volume, there was still a soft high frequency noise. Nothing you'd ever encounter in real use but when i know its there it bugs me.
So what i did next was remove/isolate the grounding wire from the usb cable between the notebook and the E-MU. This alone did no good, but then i also shielded the metal outside of the usb connector (on emu's end), using tape. After both the grounding wire and the metal casing to the plug were isolated, the noise was fully gone.
The audio from the pc is now dead quiet wether the volume is on 0% or 100% on the amplifier. More quiet than the output of my cd player, which creates a soft noise at full volume, possibly due to the long and cheap cable i use for the cd player atm versus the short, fancy high end interconnect the emu has.
Like I said, I don't know if this information is useful to anyone here, but since it wouldve saved me some pondering and trial and error, I figured I'd just post it and may or may not be of use to someone.
Cheers, phalanger
This is about how i got 100% noisefree audio output from laptop through my E-MU 0404 USB soundcard.
Lately I've been doing some home recording and noticed that even though under normal circumstances the sound was just fine, but when not playing any music and the amp volume on full, I got audible static, clearly produced by the laptop (lcd screen, harddrive). After looking around some I found the suggestion of *not* using the notebooks powersupply plugs grounding. In other words convert the 3 prong connector to a nongrounded 2 prong one.
The result of this was very good, the display and harddrive feedback were gone, 95% of the noise was. But when turning the amp to 80% or more volume, there was still a soft high frequency noise. Nothing you'd ever encounter in real use but when i know its there it bugs me.
So what i did next was remove/isolate the grounding wire from the usb cable between the notebook and the E-MU. This alone did no good, but then i also shielded the metal outside of the usb connector (on emu's end), using tape. After both the grounding wire and the metal casing to the plug were isolated, the noise was fully gone.
The audio from the pc is now dead quiet wether the volume is on 0% or 100% on the amplifier. More quiet than the output of my cd player, which creates a soft noise at full volume, possibly due to the long and cheap cable i use for the cd player atm versus the short, fancy high end interconnect the emu has.
Like I said, I don't know if this information is useful to anyone here, but since it wouldve saved me some pondering and trial and error, I figured I'd just post it and may or may not be of use to someone.
Cheers, phalanger