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Gungnir MultiBit technical measurements

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atomicbob:
Balanced XLR output through Radial Twin ISO (Jensen transformers) for single ended conversion measurements part B

1kHz @ -90dBFS



20 Hz square wave 0dBFS 12Vpp 10ms



20 Hz square wave 0dBFS 12Vpp 500us



1 kHz gain linearity



Imaging

atomicbob:
In this section 1 KHz -90 dBFS comparisons between USB, Optical and SPDIF for both Balanced and Single Ended are presented.

Due to concern about the results of Single Ended measurements for 1 KHz -90dBFS and measurement setup with the dScope,
there is also a 1 KHz -90dBFS comparison using the P5243B oscilloscope.

P5243 oscilloscope measurements were consistent with those obtained by the dScope.

Gungnir MB power on time was 27 hrs at time of measurements.


Bal 1 KHz -90 dBFS optical



Bal 1 KHz -90 dBFS spdif BNC



Bal 1 KHz -90 dBFS USB



SE 1 KHz -90 dBFS optical



SE 1 KHz -90 dBFS spdif BNC



SE 1 KHz -90 dBFS USB



Bal 1 KHz -90 dBFS USB P5243B oscilloscope



SE 1 KHz -90 dBFS USB P5243B oscilloscope

Clemmaster:
Thanks for the measurements!

The RCA results look weird, though. Why is the noise floor so high compared to XLR?  :-\

atomicbob:

--- Quote from: Clemmaster on September 25, 2015, 10:56:15 PM ---Thanks for the measurements!

The RCA results look weird, though. Why is the noise floor so high compared to XLR?  :-\

--- End quote ---
I don't know. I checked the SE measurements multiple times, re-positioned equipment, cables, disconnected and reconnected cables, tried different cables, cycled power and rebooted dScope and laptop. Same results. I expect the SE output to be a little higher in noise. Maybe Jason has a suggestion. I won't have another time opportunity to repeat any measurements for another week.

However, it should be noted that I am thoroughly enjoying the sound of the Gungnir MB balanced output through the Twin ISO Jensen transformers into a Project Sunrise III and HD650 headphones. The Gungnir MB is an exceptional performer. It well deserves its position on Marv's DAC chart. Tomorrow I'll spend some more time listening to the Single Ended outputs.

Marvey:
Yeah, the 1kHz sine wave at -90db looks mysterious - everything else looks good.

Note increased distortion, especially down toward the bass, with the Jenson XLR-> SE transformers. Not something to worry about, but I suspect a slightly warmer sound from them.

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