Do you have a picture or schematic of how your amps are wired up?
And considering the ncores are DC coupled, could it be that your DAC puts out a DC component that biases the amps to near clipping?
And considering the ncores are DC coupled, could it be that your DAC puts out a DC component that biases the amps to near clipping?
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Balanced cable wiring is according to the Hypex datasheet and appnotes.
DC is a possibility, but i notice the issue with ucd400hg as well which is not DC coupled. Also the DC on the DAC output is around 30mv.
couple of observations on the XLR connections.
The DAC has 4 IV boards, each feeding 2 XLR connectors on the DAC chassis. Connection from the boards to the XLRs on the chassis use balanced shielded cable. Shield goes from gnd on the board to pin1, pin1 on the XLR is also shorted to the chassis.
on the amp end, XLR input pin 1 connects the shield to amplifier chassis. The connector to the amp modules is the Hypex provided balanced input cable.
The DAC outputs spans to 4 amplifier chassis each holding 2 amp channels.
Could this be creating GND complications?
The distortion is audible at certain volume level from the DAC. If you had a chance to listen to the sample, does it sound like anything you have experienced before?
sorry. they probably expired.
Could you try this
https://drive.google.com/open?id=0B7X-dOhSii2xUmtEVXBzOEFnbUE
https://drive.google.com/open?id=0B7X-dOhSii2xRVNXRVZYeDVKV28
Could you try this
https://drive.google.com/open?id=0B7X-dOhSii2xUmtEVXBzOEFnbUE
https://drive.google.com/open?id=0B7X-dOhSii2xRVNXRVZYeDVKV28
If a thread was made dedicated to NC-400, rather than general Ncore amps, chances are it would stay on topic better.
Is is common mode or differential mode DC? Meaning are you measuring it between two signal wires or on each of them re. chassis/ground? Common mode DC can also cause clipping of input stages if it is too excessive.
I checked again.
DC offset on each signal wire of the balanced pair on the DAC output is around 178mv. But common mode DC is almost 0.
DC offset on each signal wire of the balanced pair on the DAC output is around 178mv. But common mode DC is almost 0.
Igor,
Please continue any post on the diy thread created above
http://www.diyaudio.com/forums/class-d/302602-ncore-diy.html
thanks
Please continue any post on the diy thread created above
http://www.diyaudio.com/forums/class-d/302602-ncore-diy.html
thanks
I would talk to Hypex support. Since you must be an OEM client of their's in order to obtain those amps, they will be glad to help.