Speakers will always make the biggest different in sound quality, bar none. The question is when does one stop ?
Upgrade speakers or DAC
Next upgrade is going to be either Front L/R speakers or streamer. Current speakers are Sonus Faber Olympica III, looking to upgrade to Il Cremonese. Streamer is Cambridge Audio Edge NQ looking to upgrade to dCS Rossini APEX.
Which upgrade will make the most significant improvement?