Talking about “golden ears”.
Basically there is a subset of people that can hear small details that usually escape most people (like me for example). Janis has those…
Not happy with the feedback of "mid to hi frequency reproduction problems " from above , our engineering team has taken the BOSS and started reviewing it from the top. We started with the filters , LDOs , Oscilators …nothing. Ground was checked , jitter , again nothing.
At last we arrived at low pass filter in the end of the analog signal. On the Piano TI has in the datasheet a LPF with 73Khz cutoff, in the new datasheet they have it at 150Khz (so different resistors and capacitors). What we did, is we took the old capacitor value and added the new resistor to it…basically a cutoff frequency of 16Khz (-3db). From 8-20Khz the LPF is introducing noise , instead of cleaning hi frequency noise thats above human hearing(but still can distort the audio)
We are rushing now, testing the unit with the right values and sourcing in time for mass production.
I am now a firm believer that Janis has " golden ears"…