# Mixer noise problem **URL:** \ **Category:** General Discussion\ **Created:** [August 13, 2010, 1:23pm UTC](https://forum.djtechtools.com/t/mixer-noise-problem/13345 "2010-08-13T13:23:56Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![tr0uble](https://avatars.discourse-cdn.com/v4/letter/t/5daacb/32.png) [@tr0uble](https://forum.djtechtools.com/u/tr0uble)\ **Post date:** [August 13, 2010, 1:23pm UTC](https://forum.djtechtools.com/t/mixer-noise-problem/13345/1 "2010-08-13T13:23:56Z")
**Mixer noise problem** Hi guys, I’ve just bought a brand new NI Audio 2 soundcard, plus a secondhand Numark 2-channel mixer from Ebay because I wanted to be able to mix externally with my setup (which also includes Traktor Pro and an Oxygen 8). The mixer has arrived intact, but disappointingly when I tried it out in my headphones there was an intermittent crackling noise, only present when music was playing. I don’t think it’s my headphones, which have always worked fine – so pretty sure it’s a problem with my mixer. I guess if I plug my monitors in and they sound fine, I can narrow it down to a problem between the headphones and mixer – possibly the connection? Whether or not that turns out to be the case, can I have some suggestions about how to diagnose and repair? Thanks in advance. ---
**Author:** ![Ed\_Paris](https://sea1.discourse-cdn.com/flex001/user_avatar/forum.djtechtools.com/ed_paris/32/13850_2.png) [@Ed\_Paris](https://forum.djtechtools.com/u/Ed_Paris)\ **Post date:** [August 13, 2010, 1:34pm UTC](https://forum.djtechtools.com/t/mixer-noise-problem/13345/2 "2010-08-13T13:34:47Z")
Had a similar problem and solved it by using 2 different power suplies. One for the laptop and another one for the mixer. Maybe it works this way ---
**Author:** ![GPS](https://avatars.discourse-cdn.com/v4/letter/g/8797f3/32.png) [@GPS](https://forum.djtechtools.com/u/GPS)\ **Post date:** [August 13, 2010, 1:36pm UTC](https://forum.djtechtools.com/t/mixer-noise-problem/13345/3 "2010-08-13T13:36:50Z")
> [@](#): > > Had a similar problem and solved it by using 2 different power suplies. One for the laptop and another one for the mixer. Maybe it works this way play it safe, power verything. Only you can prevent forrest fires.