I'm getting an unacceptable ammount of white noise comming throughthe left channel. At first I thought it was the RCA/Ground set-up comming from the turntable. But I've plugged the other turntable into the left channel and it's the same. I'm 100% sure it's not the mixer so that leaves the amp. itedly the amp is not grounded to anything, but I've never had any issues with this before...Has the left channel on the amp had it, or do I need to ground the amp ?
I ended up buying one of these after years of line noise issues at the various places that I lived. If you plug everything into this you may end up solving it.
What decks, mixer and amp do you have?
Why are you 100% sure its not the amp when you dont seem 100% sure of what you are doing......
You wont need to ground the amp as you should not be using the phono input on it and that is usually the only one that needs grounding. The mixer output should go to a line level input on the amp.
Swap left and right cables from your mixer to the amplifier. So red cable on mixer goes to white on amp, and vice versa for other cable. If the problem stays with left speaker, then the source (in this case the mixer) isn't the issue. If it goes to right speaker, then it is the mixer. If it goes to right channel, try another source, like mp3 player or phone.
Then try plugging into another input on the amplifier. See if it's any better.
A common issue is volume controls, input selector and various other buttons and knobs that get dirty and corroded over time. Is the noise constant or does it come and go? If it comes and goes that is usually indicative of this problem. With the amp turned off, turn the volume up and down completely about 50 times, do it quickly. Same with input selector, whether it's a rotary knob or push buttons. If this makes it better, then you know the problem. The long term fix is to properly clean the potentiometers and switches with cleaner and do the same steps (turn quickly, push quickly, etc).
Excellent advice already so I'll just second cleaning your s and switches with DeoxIT or 99% isopropyl alcohol. It's essential in my dry winter climate, and was for other reasons too when I lived in a humid climate. :rolleyes:
fto-dj
What decks, mixer and amp do you have?
Why are you 100% sure its not the amp when you dont seem 100% sure of what you are doing....
I didn't say I was sure it wasn't the amp. I said I'm sure it's not the mixer. And that is because the mixer is new. My set-up is'
2x technics 1210. 1 Omnitronic TRM202 mixer. Cambridge A1 Intergrated amplifier. 2 X JBL Control 1 studio monitors.
jondavey
OK, ASo I did this and the noise went to the right speaker.... $H1T that means it's the mixer, rifght ?
Yeah, sounds like it. To you should try another source for a while to see if you hear the noise. As previously mentioned, phone, mp3 player or laptop would be good candidates. Try it for a good long while. If no noise then yeah, mixer for sure.
Ok, so I've tried other sources and this has narrowed things down to where the culprit is, no doubt, the mixer.
I've tried quickly turning the volume up and down 50 times (as reccomended by yourself) with no result. I guess I'm going to have to open the thing up ! I do have some isoproponol but I have no idea what to do with it really or where to apply.....
....so I've just heard back from the guy I bought the mixer from and he said it was working without issue right up untill the moment he boxed up and posted it ! And I've already left positive for the transaction on eBay, so he'd have nothing to gain by not telling the truth. So where do I look now ?
....Having said that, I just now removed everything from the mixer..all cables and it's still producing noise in one channel. I can see this because of the volume meter. So it just HAS GOT TO BE the mixer, right ?
Here's what you do. First try the booth output, instead of master. If problem persists then follow along.
Your dj mixer has three channels. Is the problem present on all three channels? If you can isolate the problem to one of the three, try to open ît up. Swap the line faders from working channel to not working channel. Does the problem follow the line fader? If it does then you have two options, look for a part number on the fader and find a replacement. You can also try to clean it, spray some cleaner or fader lube into it and move the slider up and down. Could try just a few drops of isopropyl as well I guess, but would be careful not to overdo it. Or you know, if you only use two channels of the three, take the fader from the 3rd which you don't use to swap the bad one.
If the problem is not with the line faders, it's past anything I can give advice on. Bad pots and faders are easy to isolate and swap. Beyond that it gets complicated. Might be enough of an excuse to get a new mixer.
arteom
send that shit back, not worth the trouble.
I can't. The seller had a no returns polocy. But he has given me his phone number and has said he'll talk me through the issue...I'm going to call him in a sec.
what mixer is it? Let's suppose it's a 2 channel mixer, you have two turntables connected, one to either channel. Is the problem present only in one?
If the problem is present in only one of the two channels, try the working turntable connected to noisy channel. Does the problem stay with the problem channel or does it go away? I think you already said you tested this.
No matter if it's a rotary potentiometer or line fader. Without knowing the specifics I would guess the pot (which you use to control volume, bring in mixes) is connected to the PCB with a cable. So if it's two channel mixer you have two pots, and cable going from them to the PCB. Swap those two cables on the PCB. In use this would mean when you turn the pot for channel 1, it turns up the volume for channel 2. Then test to see if the problem now swapped channels. If it did, then you can say the problem is with the pot itself.
Beyond that, can check for burnt fuses.
If you paid for the thing with paypal you might have some recourse by filing a claim with them. Unless this person listed the mixer as defective, I wouldn't hesitate to file a claim to recover funds.
arteom
If you paid for the thing with paypal you might have some recourse by filing a claim with them. Unless this person listed the mixer as defective, I wouldn't hesitate to file a claim to recover funds.
But I really want this mixer ! It was listed as fully operational, however I was just messaging with the guy who sold it me nd he doesn't know his arse from his elbow ! He tried to implicate the amp and speaker set up and when I told him that the signal chain origonates in the mixer (I had the mixer set up without any source to prove to him that it was the mixer) he was baffled. He had never heard of RCA leads and he was playing his CDJ set up through the 'line' channel !!!
You sure that you didn't switch anYthing wrong simply?
You have 2 channels with 2 separate inputs each.
1. a combined Phono/Line input that can be switched (button on the back next to the inputs)
2. a separate dedicated line input.
You can switch between each of the two inputs per channel via the button above each channel on the front ..
jondavey
I wouldn't buy an analoug mixer to put a digital signal through in the first place...
I really don't get your analog obsession in that context as basically any mixer is analog unless it has some nifty effects section or whatver gadgets built in.
The RCA signal coming out of the CDJ is... analog of course, as RCA is.. analog.
Anything that is directly routed from an RCA line in to an RCA line out is an analog signal.
Why would you pay the for a mixer with additionally built in DAC and effects and all those bells and whistles if you don't need any of those extras?
The phono/line settings on the back of that thing don't look all that straightforward. It wouldn't hurt to have a second set of eyes take a look, if you have a friend that is familiar with some of this stuff.
Off the bat I'd say make sure the line and gain settings on the back of the mixer are matching. When talking previously about noisy pots and buttons, these could affected. Especially if the prior owner never used turntables. So try engaging and disengaging that "LINE" button 10-20 times quickly, and turn the GAIN dial up and down completely 4-5 times. Do same with PH1/LINE3 & PH2/LINE4 buttons on the top of it.
You might also see if the issue is present with a line source, such as cdj/phone/laptop using a 3.5mm to RCA cable. Could be shit phono section on one of those channels. Previous owner wouldn't know if he never used turntables.
....I ed Omnitronic by email. I have a reply, which is encouraging, asking for more detail on the issue. So hopefully something will come of that. I bottled out of opening it up though. I really have no idea what I'm doing with that level of electronics !
Cheers bud ! I did try your idea about switching the line/phono button multiple times and the gain but unfortunately it had no effect. I appreciate the help though !
