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djx-700 noise
hey all, i've had my behringer djx-700 for about a month and a half and i wanted to know if anyone else hears an eletrical hum when the volume is turned up. i made sure my tables were grounded right and tight, and i am sure its coming form channel 3. i'm gonna fiddle aroudn with the channels, but has anyone else come across this?
oh yeah, other than that i love it and yes i know the pioneers are better, but i only bought this one so i can get used to the fader layout for when i'm not using my friends djm-500.
much love to you expressing yourself through music
yea i have an electical hum as well. but mine is through the master output. the louder the master is the louder the hum is. but when its up loud i cant hear it anyway, only ever hear it when there is no sound soming from my speakers.
i have the same prob with my VMX300 . Just kill that channel, unless you're using it. That solved the problem for me.
channel transfer
i just transferred my second deck over to channel 4. i still hear some hum, but not too too bad.
i guess this is something i'll have to deal with
thanks all
Maybe you could try their after sales services... After all, the mixer should still be under warranty...
BEHRINGER USA Inc.
190 West Dayton Avenue, Suite 201
Edmonds, WA 98020
Tel.: +1 425 672 0816
Fax: +1 425 673 7647
Try giving them a call, and ask for a local repairer. Or explain them your problem and maybe there is a simple way to fix it.
Or you might check their online help, but I'm a bit sceptic about that...
here
(maybe, diesel0, you can do the same for your vmx300...
BEHRINGER Canada Ltd.
P.O. Box 24043
Dartmouth N.S. B3A 4T4
Tel.: +1 902 860 2677
Fax: +1 902 860 2078
)
Hey guys, if someone does call Behringer and end up getting it fixed, please post it on here as my djx700 is on it's way in the mail to me! Thanks!
calling behringer
i'll give them a call tomorrow and let y'all know what's up. i just think its funny they advertise no noise and that's what i got.
unfortunately, we don't have much as far as dj quip goes here in san antonio, so i'm at behringer's mercy.
it's most likely a bad ground connection. make sure your tables are gounded to the mixer if they have grounding wires. also see if there is a switch on the back of the mixer for "lifting" the ground. try toggling that if there is. if that doesn't solve it your problem was probably buying a djx-700. cheers.
I don't understand why everybody is so sceptical against behringer. I've had no complaints about any their products. Of course it isn't 100% proffesional equipment, but, you get what you pay for!
i dont have a behringer mixer, mine is a cheap ass numark dm-1285, but i do have a bit of noise, or possibly this "hum" that you guys speak of. if i have the master level set kinda high and turn up any of my channel faders i get some noise coming thru my speakers. the only time that i notice this is when i have no music playing. i always just assumed that this was because i have a cheap ass mixer. its never noticeable while music is playing, and hasnt affected my mixing at all. i think its just a fact of life when you have $200 mixer.
I've looked this up in my manual of my VMX300:
S/N ratio = 85dB
The DJX700 has an S/N ratio= 80dB
The VMX300's sound quality is slightly better than the DJX700. But still, you shouldn't have more than 1.2 Db of noice if you use it at home, 1.2Db is harly hearable...
Electrical hum shoudln't be there...
(Just to compare: the DJM600 also has a 85 S/N ratio)
i havent gotten any hums with my DJX 700 yet, so far so good!
Another problem that can give you hum is a ground loop, this is quite an issue with audio equipment, especially in older homes or buildings. You can buy an isolater for this for 15 dollars, I ran into this problem way back when I used to play in a band, and not too long ago when playing mobile at a older club.
What happens is, the ground that is connected to your audio equipment is ran all over the place, and isn't terminated to earth ground enough. So, you get 60HZ hum (if you live in the US) induced into the ground, plus you get a thing called floating ground because the resistance changes as the ground wire is ran all over causeing different voltages to be present at different points. Get a "ground loop isolator", you may not need it now, but if you set up a mobile gig, I promise you will run into it somepoint or another.. 
I was just about to ask if anybody have tried this mixer. Besides the humming, what are your overall opinions about this mixer?
in which aspects is the DJX-700 worse than the DJM-600?
As a student I can't really afford a DJM-600 right now, and my shitty numark DM-3002X is just pure SHIT.
| quote: |
| Originally posted by DJ_Laszlo I was just about to ask if anybody have tried this mixer. Besides the humming, what are your overall opinions about this mixer? in which aspects is the DJX-700 worse than the DJM-600? As a student I can't really afford a DJM-600 right now, and my shitty numark DM-3002X is just pure SHIT. |
opinion
i really like my djx-700. i'm really getting used to the knobs and faders now so when i use my friends djm-500, i don't feel like i'm in a foreign land. don't get me wrong, i wish i had a 500, but this mixer suits me fine for now.
So is the cause of the humming the wiring in your homes and not the mixer itself?
What about any crackling sounds coming from the faders? Anyone?
ive the feeling that the headphone output has a little delay on the master about a few milliseconds...when the songs perfectly match in the headfone and i begin to mix its not fitting anymoreive to pitch bend the other track a bit and then it works..i think theres a small delay from the master to the headfones
stiffmaster: well the case is this, either you listen to both songs cued in your phones and then a delay won't do any difference or you have a cue in your phones and you hear the other song from the speakers...
it doesn't matter how good your mixer is, there will always be a little almost unnoticeable delay between the speaker and your ear so it all boils down to how good your ears are 
I experience the delay a lot because my hearing is not the best (tinnitus and a slight hearingdamage on one ear) but I've learned how it should sound when the tracks are matched and on top of that I always doublecheck it by cueing both tracks just in case
| quote: |
| Originally posted by Vizay I always doublecheck it by cueing both tracks just in case |
response from behringer
hey all, this is the response i received on my mixer
Hello David,
Thanks for writing! Sorry for the delayed response... Check out the following notes, and let me know what you think:
Noise can come from a number of places in an audio system. First solution, gain staging. Make sure you have correctly adjusted the in/out gains of each component in the system to maximize signal to noise ratio. EXAMPLE: You don't want to crank the output stage and have the input gain way too low. The result from this will be unwanted noise. Most units will have a "unity" setting for gain controls, which is the optimal setting for S/N ratio for that unit. Set your levels here, and when increased volume is needed, boost at the channel gain first. You usually want the channel stage to be boosted higher than the output stage for best clarity.
Second solution, cabling. You need to use good-quality cable (shielded if possible) that is of the correct impedance (low z or high z) for the application. When using unbalanced cables, you want to make sure that you keep your cable run as short as possible due to the fact that these cables send signal on the ground. This increases the noise (and decreases S/N ratio) the further the signal has to travel. For long cable runs 15' and longer, balanced cable is recommended. The shielding will keep unwanted interference (radio waves etc) from being induced into the signal path. This can also help cut unwanted noise.
Third solution, your electricity: When you are using multiple units with different ground connection paths, you can run into ground loops. There are ways to get through this, the simplest being the use of a direct box with a ground lift switch (Our DI100 retail $59) or ground lift plug. This will kill the loop and the interference (noise) between the two conflicting units. There can actually be ground loops inside the unit itself (this would be a defect and would require the services of a qualified technician).
If you can narrow down your noise source to one of the aforementioned problem areas, you can make your life a lot easier. Give this trouble-shooting method a try, and if none of these methods helps your problem, you may have a faulty unit. If this is the case, contact our Behringer USA Customer Support team for details on having your unit repaired.
Please include previous comments when responding to a technical support email so I can follow our previous order of events! Thanks!
Kind Regards,
Chris Gomez
Technical Support Administrator
BEHRINGER USA Inc.
Tel: +1 425 672 0816 ext.139
Fax: +1 425 673 7647
Email: [email protected]
www.behringer.com
i got my response within about an hour. these guys have a badass customer support department. i'm gonna try some troubleshotting and see what happens. i'll keep y'all informed.
they seem to have a pretty decent after-sales service...
no noise yet...
when i first got it there was a hum, but then i made sure that the ground wires for e/ turntable was grounded in the channel it was using, and that got rid of it. don't know if that mattered or not, i don't know anything about electricity, but i have no hum.
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