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RE: Dell Laptop and Furutech GT40

65.19.76.104

In Reply to: RE: Dell Laptop and Furutech GT40 posted by DustyC on July 21, 2012 at 08:55:03

You need to isolate where the spurious signal is coming from. Start by recording with the preamp powered down. If still present, disconnect cabling between preamp and sound card. Try recording at different sampling rates and bit depths to see if these affect the frequency of the spurious signals.

Try a different sample of this product. If the problem persists, try a different external sound card. A decent sound card will be far better. For example, with the ADC on my juli@ connected to a powered down cassette deck the largest peak in the noise spectrum is -115 and this is 60 Hz hum. All the other spurious peaks are below -120 dB. (This is at 88/24.)

Tony Lauck

"Diversity is the law of nature; no two entities in this universe are uniform." - P.R. Sarkar

Follow Ups:

Tony - DustyC 13:22:20 07/21/12 (3)
The problem still exists even with just leaving the USB cable from the GT40 connected to the laptop, (no other connections at all).

In fact when I played back some recorded tracks and then played back the vinyl for my wife to listen to, see said "yeah, it's pretty dismal, it almost sounds like your playing it thru the laptop speakers, then out to the stereo".

I tried to disable all other sound hardware and drivers but if I do that then I get nothing to work. It looks like at least some sound hardware and software must be running on the laptop in order for this to work. I thought that only the external device (GT40) was supposed to be enabled and isolated as the only sending and receiving device.
- RE: Tony - Tony Lauck 14:45:20 07/21/12 (2)
  From the Audacity manual it looks like Audacity maps through the default Windows recording and playback devices. Are you sure that you have set these up to the GT40? If so, then it should be possible to disable the on-board sound card and use only the GT40. There are separate settings in Windows for playback and recording. Note that there are at least as many ways to get the Windows audio stack set up incorrectly for recording as for playback.
  
  I bypass all of this Windows nonsense by using ASIO. To do this requires a sound card and a recording application that both support ASIO. It appears that the GT40 has an ASIO driver, but I don't believe that Audacity supports ASIO. (At least not in the version of the manual that I looked at.) If you want to try using ASIO you could install a free trial download of Soundforge.
  
  Someone who has a GT40 and/or uses Audacity might have better suggestions than I can offer, if these don't help.
  
  Tony Lauck
  
  "Diversity is the law of nature; no two entities in this universe are uniform." - P.R. Sarkar
  - RE: Tony - DustyC 16:18:37 07/21/12 (1)
    For both playback and record the Audacity settings point to the GT40. There is an onboard software driver that I disabled along with the hardware but when listening to that record and playback it sounds worse.
    ASIO is mean't for playback only right?
    - RE: Tony - Tony Lauck 16:47:10 07/21/12 (0)
      ASIO is for both record and playback.
      
      Tony Lauck
      
      "Diversity is the law of nature; no two entities in this universe are uniform." - P.R. Sarkar

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