A straight line doesn't look right for distortion. See plot in post 4391.
Just to the top-left of the REW chart is a button that snaps a digital picture of the plot - and looks great when uploaded to DIYaudio, as in post 4391.
Just to the top-left of the REW chart is a button that snaps a digital picture of the plot - and looks great when uploaded to DIYaudio, as in post 4391.
Last edited:
Dcx
Hi
When I use the camera symbol, it just show the straight line, no data, when digital signal comes out and analog comes in the pc, what is wrong here?
What function in REW must be used?
Tojoko.
Hi
When I use the camera symbol, it just show the straight line, no data, when digital signal comes out and analog comes in the pc, what is wrong here?
What function in REW must be used?
Tojoko.
is the increasing distortion due to analogue output stage?
maybe a passive output keeps distortion constant?
maybe a passive output keeps distortion constant?
Your image export and your straight line are two different things.
Can you save, zip and post one of your REW measurements here?
@Marconi. Yes, I believe so. I remember bypassing the analog section eliminated the higher harmonics. The AKM DAC is pretty good.
Yes, better. But that mostly looks like 50Hz mains noise.
You can do single tones in the RTA window and Spectrum mode. I found different harmonic structures at 44, 440, 1000, 5000 Hz. Pick the frequencies you like. It's often easier to see what's happening in spectrum analyzer mode.
You can do single tones in the RTA window and Spectrum mode. I found different harmonic structures at 44, 440, 1000, 5000 Hz. Pick the frequencies you like. It's often easier to see what's happening in spectrum analyzer mode.
Hello there, what are the cheapest/fastest mods to do on the DCX knowing the fact that it is connected via XLR in inputs A/B/C from my EMOTIVA CMX2 and feeding 3 bi-amp speakers (low/high filters).
the thing is that I have some ground noise that I would like to get rid of.
Thank you in advance!
the thing is that I have some ground noise that I would like to get rid of.
Thank you in advance!
Tojoko, thanks for the measurements, I am able to open them no problem.
But I don't understand what is going on here. The noise floor in the second measurement show spikes that do not look mains frequency related. Overall distortion is low, but it looks very spiky. Maybe it's a clock problem?
What are you using to get the digital signal to the DCX and what are you using to get the analog signal back into REW?
But I don't understand what is going on here. The noise floor in the second measurement show spikes that do not look mains frequency related. Overall distortion is low, but it looks very spiky. Maybe it's a clock problem?
What are you using to get the digital signal to the DCX and what are you using to get the analog signal back into REW?
not sure to understand exactly what you are referring to. If it is related to the vue meters on the DCX itself, it does not move high at all
Yes, that's what I meant. The DCX is meant for pro line level which is a good bit higher than consumer line level. That means that if you are using the analog inputs your signal levels will be low compared to the noise levels. That might be what is causing your ground noise, or at least making it more obvious. Are you going in and out balanced?
Gain structure is important, and can be difficult with the DCX.
Gain structure is important, and can be difficult with the DCX.
But it leads me to believe that only the outputs adjust. Or does it sense unbalanced inputs and adjust those also?
The DCX is basically unity gain from in to out. But it's made for a hot signal such as would be coming from a mixing console. If the input VU meters aren't hitting near red on your loudest peaks, then you'll run into noise problems.
You might also have a ground loop, although I've found the stock input to be robustly immune to hum and buzz in balanced mode. If you are coming from an unbalanced source there are several different ways you can wire the input. First check to hear if the buzz goes away if you disconnect one or booth inputs.
You might also have a ground loop, although I've found the stock input to be robustly immune to hum and buzz in balanced mode. If you are coming from an unbalanced source there are several different ways you can wire the input. First check to hear if the buzz goes away if you disconnect one or booth inputs.
passive out DCX2496
Hi Pano
Did a stepped measurement and recalibrated soundcard, how doe this look to you, now...
cheers, Tojoko.
Hi Pano
Did a stepped measurement and recalibrated soundcard, how doe this look to you, now...
cheers, Tojoko.