TASCAM - DR-680 - AD/DA Convertor
LINDOS AUDIO SEQUENCE TEST TASCAM - DR-680 - AD/DA Convertor
SOURCE MS20 V1.3 Recorder - file replay via Audacity/Avid PC
29-Nov-11 09:50 PM


FREQUENCY RESPONSE @0dB [u]
20Hz -1.50 -1.50
31Hz -0.50 -0.50
40Hz -0.25 -0.25
50Hz -0.25 -0.25
100Hz -0.12 -0.13
315Hz 0.00 -0.01
1k0 0.00 -0.01
6k3 0.00 -0.01
10k0 0.00 -0.01
12k5 +0.12 +0.13
14k0 0.00 -0.01
16k0 0.00 -0.01
20k0 -0.37 -0.38
25k0 -11.12 -11.13
LEVEL VS LEVEL [h]
TEST LEVEL OUT 1kHz [t]
TL dB -07.75 -07.58
DELms
NOISE ITU-468 Q-Pk REL [n]
WTD -69.49 -70.08
DIST RES 1kHz WTD REL [r]/q
-20dB -42.96 -42.88
0dB -62.07 -61.36
+8dB -68.07 -68.48
+12dB -70.81 -71.26
+15dB -72.01 -71.78
+18dB -69.53 -71.44
PHASE DIFFERENCE R-L [z]
3k15 00.00
10k0 -02.00
15k0 -04.00


Excellent result with slightly lower noise than on direct playback via the Tascam.

This is the same test as shown played back on the Western Digital player. Note that the -20dB distortion figure is lower here than on the WD player, but still higher than the -49dB figure obtained on direct playback from the Tascam. This seems to indicate that excessive quantising errors are common on so-called 24-bit A-D converters. A very acceptable result nevertheless, and within Lindos Grade A (ignoring absolute levels).

Whistles were noted audibly on the sweep high frequencies - a common problem with computer audio cards indicating a beat with the sampling frequency. They were not noted on the Tascam replay or Western Digital replay.

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