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Author Topic: Gungnir MultiBit technical measurements  (Read 1947 times)

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atomicbob

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Gungnir MultiBit technical measurements
« on: September 25, 2015, 10:03:13 PM »
20150926 UPDATE - last section added comparing 1 KHz -90 dBFS Balanced vs. Single Ended between Optical, SPDIF and USB inputs.

Look carefully at the jitter graphs. Gungnir MB jitter is impressively low.  Balanced output has an exceptionally low noise floor. Single ended jitter measurement is a little higher in residual noise floor as expected.

Channel matching is excellent.  Frequency response and square wave response left and right channels are so well matched as to overlay one another.

The 1 KHz -90 dBFS sine Single Ended measurement appears a little noisier than I would have expected and would still entertain the notion of a setup problem, though many corrective actions were attempted.

Balanced XLR measurements were at approximately 1 hr of power on time.
Single Ended RCA measurements were at approximately 3 hrs of power on time.
Balanced XLR through Radial Twin ISO (Jensen transformers) for conversion to single ended output measurements were at approximately 4 hrs of power on time.

The Gungnir MB data presented were collected as follows:
 
1.  PrismSound dScope III, picoscope 5243B
2.  DAC balanced output XLR, unbalanced output RCA
3.  100 Kohm load used for measurements
4.  44 KHz  sample rate, 24 bit depth
5.  USB input – Audioquest Forest
6.  Balanced cable Canare L-4E6S with Neutrik XLR
7.  Unbalance cable DH Labs Silver Sonic Air Matrix RCA
8.  Vaunix Lab Brick USB hub

Balanced XLR output measurements part A

Frequency Response



Frequency Response (y-axis zoom)



Dynamic Range



THD+N



IMD



Crosstalk



Inferred Jitter



Inferred Jitter (x axis zoom)

« Last Edit: September 26, 2015, 08:53:08 PM by atomicbob »
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atomicbob

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Re: Gungnir MultiBit technical measurements
« Reply #1 on: September 25, 2015, 10:12:25 PM »
Balanced XLR output measurements part B

1kHz @ -90dBFS



20 Hz square wave 0dBFS 6Vpp 10ms



20 Hz square wave 0dBFS 6Vpp 500us



1 kHz gain linearity



Imaging


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atomicbob

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Re: Gungnir MultiBit technical measurements
« Reply #2 on: September 25, 2015, 10:14:59 PM »
Single Ended RCA output measurements part A

Frequency Response



Frequency Response (y-axis zoom)



Dynamic Range



THD+N



IMD



Crosstalk



Inferred Jitter



Inferred Jitter (x axis zoom)


« Last Edit: September 25, 2015, 10:33:53 PM by atomicbob »
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atomicbob

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Re: Gungnir MultiBit technical measurements
« Reply #3 on: September 25, 2015, 10:16:18 PM »
Single Ended RCA output measurements part B

1kHz @ -90dBFS   The noise has quieted somewhat after 27 hrs of power on time. See reply #6.



20 Hz square wave 0dBFS 6Vpp 10ms



20 Hz square wave 0dBFS 6Vpp 500us



1 kHz gain linearity



Imaging


« Last Edit: September 26, 2015, 08:56:23 PM by atomicbob »
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atomicbob

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Re: Gungnir MultiBit technical measurements
« Reply #4 on: September 25, 2015, 10:17:22 PM »
Balanced XLR output through Radial Twin ISO (Jensen transformers) for single ended conversion measurements part A

Frequency Response



Frequency Response (y-axis zoom)



Dynamic Range



THD+N



IMD



Crosstalk



Inferred Jitter



Inferred Jitter (x axis zoom)


« Last Edit: September 25, 2015, 10:42:58 PM by atomicbob »
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atomicbob

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Re: Gungnir MultiBit technical measurements
« Reply #5 on: September 25, 2015, 10:18:26 PM »
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


« Last Edit: September 25, 2015, 10:44:45 PM by atomicbob »
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atomicbob

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Re: Gungnir MultiBit technical measurements
« Reply #6 on: September 25, 2015, 10:19:45 PM »
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


« Last Edit: September 26, 2015, 08:49:38 PM by atomicbob »
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Clemmaster

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Re: Gungnir MultiBit technical measurements
« Reply #7 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?  :-\
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atomicbob

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Re: Gungnir MultiBit technical measurements
« Reply #8 on: September 25, 2015, 11:03:35 PM »
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?  :-\
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.
« Last Edit: September 25, 2015, 11:51:06 PM by atomicbob »
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Marvey

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Re: Gungnir MultiBit technical measurements
« Reply #9 on: September 25, 2015, 11:12:53 PM »
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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