Hi guys, I have this simple mobile setup which consists of a Dell laptop (slightly old version, I think - 1GHz processor, 256MB RAM and 10GB harddisk, but enough for tracking on the road), a M-Audio FireWire 410 connected via a firewire CardBus adapter and a couple of ADK large diaphragm microphones. Not the most powerful quality setup, but the budget isn't overwhelming either. Now, I have a strange problem with noise. Let me just post a couple of examples on what this noise sounds like, with microphones connected and phantom power added: http://184.108.40.206/Mike/bring_the_noise.mp3 And the normalized version (beware!): http://220.127.116.11/Mike/bring_the_noise_normalized.mp3 I've discussed this back and forth on a Danish audio discussion board, but noone really has a clue what the exact problem is. The thing is, when using a dynamic microphone (the Shure SM58), it is absolutely clean. This noise only appears on condenser microphones. Strangely, the noise is not present when using the same soundcard on my home PC with the same microphones! So somehow it must be related to the laptop, or perhaps the CardBus interface. The noise is also present when using external pres connected directly to the FireWire 410, strangely, although not to the same extent. Someone also pointed out the noise was especially present at 50hz and 100hz, which is the speed of our alternating current for power... Have any of you ever seen or heard anything like this before? I'm not technical enough to be able to conclude anything, but I wish there was something that could be done about it.