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TranceAddict Forums > DJing / Production / Promotion > DJ Booth > Do digital signals (CDJs/Serato) output a special signal that can damage speakers?
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Dojomaster26
Daft Milk



Registered: Feb 2004
Location: Hickory

quote:
Originally posted by Brandt Slater
What I would suggest is, once everything is working again. Set up the gear like normal, and run program (music) through the rig. I'm not familiar with djm-2000 but I'm guessing 10 on all faders is most likely 0db. Set a good level input and output. Let the levels go to 0db. Once that's found, connect to your amp without speakers attached, don't want to piss off the neighbors. Crank both amp channels to full and watch what your amp is reading. If you're seeing limits come on, try adjusting the gain on the back of the mixer like Clay described and see if that eliminates the limits. At this point your entire system should be unity or 0db. As far as turning the amps, I wouldn't go any lower than 2 o'clock. What model amp is it and what type of speakers? Are the speakers running passive full range, or bi amp? The reason is because all our boxes at Clair are JBL loaded and we use Crown, QSC, and Lab Gruppen amps. I cam give you info on what these guys want to see.


I think it is something like Audiovox? I don't remember, but I do know it wasn't a brand that I recognized from PSSL, Sam Ash, etc.

The process you typed looks really solid. I will share that with the friend and see if he can get to the bottom of this before blowing his gear again.

quote:

Another thing. You friend may want to consider at some point, getting a compressor/limiter. This will greatly protect the speakers and the amps.

This is bugging now, who is sound guy that told you Serato was the problem? Maybe he's hitting too much of the old stale 54 candy cause that's a crock a shit.


The amp supposedly has a limiter built in, and the speakers have built in crossovers. Who knows?

I wish I knew who this sound guy was too... Part of me thinks that this guy said something completely different, but that it was interpreted as "digital signals are going to screw up your gear"

quote:
nothing is logical in the magic world of unicorns, rainbows and trance.


You, sir, win the thread.

So here's how everything got resolved: I decided that its not worth my time to try and convince someone who is set in his ways about what to do with his equipment. Friend is going to bring his gear out to an all-vinyl party or two, blow his speaker again, and realize that maybe he should have considered a second opinion.

I think it is best for me to keep my distance on this matter and maintain a good relationship than push the issue and start a fight. If someone is not going to book me because of some format bias, then so be it. I want to be booked for my mixing and my flow, not because I play or don't play on vinyl.

There will always be more gigs!


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Old Post May-19-2011 03:48  United States
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djdk
Nutritional Overachiever



Registered: Jul 2003
Location: London

quote:
Originally posted by Stu Cox
On the original topic...

While I'm convinced this guy is talking out of his arse, theoretically you COULD end up with some unwanted high frequencies in the output signal.

This is how:

Although the digital signal only stores frequencies of up to 22kHz (or 48kHz in a system with a sample rate of 96kHz - the maximum frequency is always half the sample rate), the data is just passed around as 'numbers' until it's actually needed as an analogue signal. This happens at the output of the last digital component - in this case the DJM2000.

If the last digital-to-analogue converter (which will be on the output of the DJM2000) is a big crock of shite, it could suffer from clock noise... the clock in these things can be several hundred MHz, so that frequency can get dropped onto your signal line.

But even the cheapest systems should have a low-pass filter on the output of the digital circuitry to get rid of anything out of the range of human hearing - that includes Pioneer mixers, even if their sound quality is fairly rubbish at the best of times.


Stuart you are such a geek


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Old Post May-22-2011 10:16  United Kingdom
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Stu Cox
Supreme smackaddict



Registered: Mar 2003
Location: Southampton, UK

quote:
Originally posted by djdk
Stuart you are such a geek

In all fairness it's a geeky topic. And I know you understood every word.


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Old Post May-22-2011 11:17  United Kingdom
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Brandt Slater
Supreme tranceaddict



Registered: Feb 2010
Location: Long Beach, California USA

The limiters in amps do very little limiting. Mostly protect the amp but that's it. You still need something before the amp.

I still think the day of a master word clock for dj gear is getting closer.

Old Post May-22-2011 16:05 
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TranceAddict Forums > DJing / Production / Promotion > DJ Booth > Do digital signals (CDJs/Serato) output a special signal that can damage speakers?
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