I've tried several changes in my system recently and was thinking about the relative magnitude of difference to the sound of the system that the changes have made. I came up with the following ranking:
Biggest difference first, smallest last:
1. Naim NDX/AIR wi-fi to Aurender N100 (-£1,000/+£1,500 incl iMac)
2. FW 7.1.1 to 8.1 (free )
3. Canon printer cable to Chord Sarum TA USB cable (+£750)
4. Devialet standard mains cable to Naim Powerline mains cable (+£515)
I found it difficult to decide the order of 2 and 3....
Biggest difference first, smallest last:
1. Naim NDX/AIR wi-fi to Aurender N100 (-£1,000/+£1,500 incl iMac)
2. FW 7.1.1 to 8.1 (free )
3. Canon printer cable to Chord Sarum TA USB cable (+£750)
4. Devialet standard mains cable to Naim Powerline mains cable (+£515)
I found it difficult to decide the order of 2 and 3....
IMac macOS 10.15.3 (no link to Devialet ) / MacBook Pro Retina OS X 10.14.4 / Linn LP12 / Devialet 200 / Wilson Benesch Discovery.
Qobuz Desktop Latest Version / Audirvana 3.2.18 / Audirvana Remote / iTunes 12.9 / AIR 3.0.4 / Wi-Fi / FW 8.1.0 / SAM 50%
Cambridge, UK (Updated 27th February, 2020)