Looking at the datasheets, both have a DC blocking cap on the audio output... The falcon however doesn't... That could be a reason if the DC offset isn't removed, it would be clipping constantly..

- ITT.PNG (9.19 KiB) Viewed 666 times

- CS.PNG (62.02 KiB) Viewed 666 times

- falc.png (452 KiB) Viewed 666 times
But that wouldn't really explain why the CS works and ITT doesn't anyway.