From there on I could measure the real performance of the current line and I could start to think about a new design. You are right my electronic has already outstanding measurement results and so we come to the question: Is this further improvement is audible?
Here the assembled bottom side of the new Trinity Audio Golden Reference Series preamplifier mainboard. “As you can see it is a battlefield of semiconductors, but they are all in the same team and fight together and not against each other. I am pretty sure you have never seen so many semiconductors in a “simple” preamp. By the way on the top side we have roughly 1500 passive elements!!!
The current line was developed with a R&S audio analyzer, which was limited by its low distortion generator, which had a spurious free dynamic range of 115-120dB. I reached this limit with the current line, but to improve the electronic I needed the new audio analyzer from Audio Precision, which offers a dynamic range down to -140dB. That is a factor of 10 in improvement. By the way I was the first who bought this analyzer.
What I can say is, that I could hear differences, but I could not measure difference, if I tried to optimize the feedback resistor in the TRINITY DAC. So I would assume we should hear improvements, if we can measure improvements.
Here the FFT of the completed active electronic. In this case I have both gain stages in series and therefore 12dB Gain(factor4) At 12.52Vrms output voltage we see at 3kHz a spectral line at -140dB. By the way the power amps needs only 1Vrms to deliver the full power. So this signal is 10 times too high, but I wanted to see how far we can go.
What I can say for sure is, that this design is not a hand tune prototype, I have assembled the 8-layer PCB and got what I expected. There is no way to tune the circuit, which means I can duplicate these results, without any problems.” – Dietmar (Trinity Audio)