YELLOWTECH - PUC - AD/DA Convertor
LINDOS AUDIO SEQUENCE TEST YELLOWTECH - PUC - AD/DA Convertor
SOURCE MS10 V3.0 Output balance check
07-Sep-05 05:07 PM


FREQU RESPONSE @0dB [u]
20Hz -0.75 -0.75
31Hz -0.50 -0.38
40Hz -0.25 -0.13
50Hz +0.00 0.00
100Hz -0.13 0.00
315Hz +0.00 0.00
1k0 +0.25 -0.13
6k3 +3.13 -1.75
10k0 +3.63 -2.13
12k5 +3.88 -2.38
14k0 +3.74 -2.50
16k0 +3.63 -2.75
20k0 +2.49 -4.13
25k0 -14.74 -21.00
TEST LEVEL OUT 1kHz [t]
TL dB -03.74 02.77
DELms
NOISE ITU-468 Q-Pk REL [n]
WTD -56.82 -55.71
DIST RES 1kHz WTD REL [r]/q
-20dB -36.70 -35.11
0dB -53.83 -51.20
+8dB -50.91 -49.34
+12dB -49.39 -47.80
+15dB -47.76 -46.25
+18dB -43.04 -39.23
PHASE R-L [z]
3k15 -96.00
10k0 74.00
15k0 108.00


Major Problems! This test was made using a simple adaptor into the MiniSonic which loads each side of the left channel with 4.7k to ground and connects each side to the + input of a different channel. Both channels should therefore read 0dB at all frequencies, but in fact the left can be seen to be -3.74dB and the right +2.77dB (Test Level figures). This huge imbalance, which has been confirmed by simply testing with an oscilloscope, is seen to reduce with increasing frequency.

This is totally unacceptable, because although many balanced inputs will ignore the imbalance, it cannot be assumed that they will work to specification, and clipping or distortion may result.

The frequency-dependant imbalance also gives rise to huge response anomalies if a proper balanced attenuator is used to feed a consumer input, demonstrating an all too common problem with floating outputs.

This is why we recommend the use of centre-grounded balanced outputs in the modern studio environment - see 'UniSon'pages on the Lindos website.

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