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TranceAddict Forums > DJing / Production / Promotion > DJ Booth > djx-700 noise
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Dj EclIPse25
tranceaddict in training



Registered: Oct 2003
Location: cedarburg, usa

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..

Old Post Oct-27-2003 07:21  United States
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Laszlo
The weekend has landed



Registered: Dec 2002
Location: Szekelyföld Status: Official Montreal Canadiens fan of TA

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.


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Old Post Oct-27-2003 15:08 
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Vert
TrancEaddict



Registered: Jul 2003
Location:

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.


Howabout trying a search..

es


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Old Post Oct-27-2003 15:42 
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dieselatx
tranceaddict in training



Registered: Oct 2003
Location: San Antonio, TX USA
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.


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Old Post Oct-27-2003 16:35  United States
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rafale
-TA-



Registered: Sep 2003
Location: Kuala Lumpur

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?

Old Post Nov-01-2003 04:51  Malaysia
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DennisF
up & down and all around



Registered: Nov 2001
Location: Europe

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

Old Post Nov-01-2003 14:14 
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Vizay
immiNspired



Registered: Dec 2001
Location: Stockholm & in my mind

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


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Old Post Nov-02-2003 23:24  Sweden
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Arsalan
debsh - toronto



Registered: Nov 2002
Location: Toronto

quote:
Originally posted by Vizay
I always doublecheck it by cueing both tracks just in case


this is what you should every time ;d


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Old Post Nov-03-2003 19:34 
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dieselatx
tranceaddict in training



Registered: Oct 2003
Location: San Antonio, TX USA
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.


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Old Post Nov-08-2003 03:03  United States
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Tiger777
Pensionable tranceaddict



Registered: Dec 2002
Location: Ternat

they seem to have a pretty decent after-sales service...


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quote:
Originally posted by Push2005
Ik ben net terug begonnen met cassettes op te kopen... Die pitchcontrol is echt ongelofelijk !

Old Post Nov-08-2003 12:47  Belgium
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dknylady
Supreme tranceaddict



Registered: Aug 2002
Location: NJ baby!

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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Old Post Nov-08-2003 18:27  United States
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TranceAddict Forums > DJing / Production / Promotion > DJ Booth > djx-700 noise
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