OK, Purifi gave me a few more details regarding this mono input buffer, and I'll just copy and paste it here from the email they sent me. Pretty sure they won't mind, as if this were confidential they likely wouldn't have shared it with me. It's free marketing for them
- 14dB SE/Ballanced gain stage based on OPA1612 with Panasonic thin film 0.1% resistors and Kemet NP0 linear capacitors.
total system gain is 27dB as for the EVAL1 kit
- Gain stage can be bypassed
- Very low noise and low output impedance linear regulators for the gain stage and for analog circuits on the 1ET400 module
- Available with XLR/Speakon connectors or without
Prices aren't final yet and they hope to have it on the webshop by early June. Their current thinking is a price of 150USD for the fully stuffed version and around 135USD without XLR/Speakon connectors.
The board is manufactured and tested in DK