AES-67 sounds thin and has high pitched noise on E-Dante

Clear-Com has many products that can support AES-67, and this note only applies to the E-Dante card.

When receiving L24 encoded streams over AES67, it is possible for some channels to exhibit digital noise and to have a flatter waveform than expected.

Via Dante card (note the jagged high-end peaks):

Via LAWO R3LAY VSC:

The resolution is to set the E-Dante card’s preferred Sample Rate to match the incoming audio. Find the encoding setting from the SDP, 24 bit in this case:

 

v=0
o=- 53333 0 IN IP4 192.168.9.9
s=Some-Audio-Stream
t=0 0
a=mediaclk:direct=0
m=audio 5004 RTP/AVP 96
i=RAVENNA Audio-strm0/40,RAVENNA Audio-strm0/41,RAVENNA Audio-strm0/42,RAVENNA Audio-strm0/43,RAVENNA Audio-strm0/44,RAVENNA Audio-strm0/45,RAVENNA Audio-strm0/46,RAVENNA Audio-strm0/47
c=IN IP4 239.140.5.6/32
a=rtpmap:96 L24/48000/8
a=framecount:48
a=ptime:1
a=recvonly

 

Then in Dante Controller or Domain Manager, set up the Preferred Encoding card-wide to match PCM 24: