I’ve recently replaced the cirrus logic audio card on the Raspberry Pi due to it failing after 18 months of continuous use in the garden. I’ve replaced it with a USB audio adapter which is connected directly to both microphones to see how it performs.
It seems to be okay, noise levels are very close to what they were before, making sure that any listeners use the correct volume levels for listening should be presented with a good binaural experience, if using an iPhone, the volume should be about 4 taps down from full volume on the device, or lower so that it sounds natural, as if you were outside and not wearing headphones.
The image above is a slight mod with the addition to quick mounting of the capsules which are sealed into the head via silicone, these slip out of the head quite easy for maintenance.
The only issue at present is that the USB device seems to stop sending audio to Darkice after a period of time, so I’m looking at ways to remedy that, probably via a reboot every 1/2/6/12 hours – I may try it at every two to start with, only takes a minute to reboot the Pi.
I’ll update this when I have the time and have successfully managed to find out why no audio is streamed without a re-boot. However, the cirrus logic audio card was really good, though needed special configuration to work with the Pi, a Raspberry Pi image file from Locus Sonus made it all possible, and without them the stream would never have been 24/7, so a really big Thank you! to them and to Grant Smith who has helped me set it up initially, thank you Grant!