I just got this last night and I hooked up Serato with it and found an issue on ch 2, 3 and 4. Basically I hear a humming signal sound when I have:

1. CH1 is hooked up with Serato SL1 on both CD and Line input
2. CH2, CH3, and CH4 all has nothing hooked to it
3. Phono is set for CH2, CH3, and CH4
4. All three eq set to high for each Channel
5. Channel fader up for all four channel
6. Cross Fader selector set to B for all three channels
7. Cross fader set to B
8. Master volume high, balance in middle, Cue is lit for master channel
9. Headphone mixing set to master and volume high
10. Now for each Channel turn trim knob to high and you will hear this sharp signal sound coming out.

This even happens if I have nothing hooked to all 4 Channels input. I have a DJM- 400 and this is not an issue in that mixer. I am trying to upload a youtube clip so you can see and hopefully hear what I am talking about. I would appreciate any help. Thanks!

If you flip the phono switches over to line, does the noise disappear? It's common enough for a mixer that has nothing grounded to it to have phono hum (although usually it also has to have a turntable or two hooked up to it).

That said, I'm wondering why you went so far as to turn the gains up to max on just about everything to hear it.

-r-

I was just pushing it I know. I was not sure if this is common. Got it last night and wanted to rule out any issues before its late. I was going thru some youtube clips and trying it out and I am loving this mixer. Thanks Ryan. (This thread can be closed)

There's absolutely no way you'd ever hear ANY of that noise under normal operating circumstances because any audio through the channel would drown it out WAY before it became an issue.

Think of it this way - if you actually had audio playing through a channel with the gain at full and all of the EQs turned all the way up, you'd be sending the signal well over +30dB which is above the overhead of the mixer.

Bottom line - don't do it, it's not a problem.