Why does my old CD player sound so much better than my new streamer?

I own a D2, and AudioTroy gave very helpful and useful info on dialing in the D2. First, set the audio volume to fixed. Second, enable DSD decoded playback. Third, if using Roon, set Roon to upsample to DSD and adjust the phase and filter settings to those recommended by Lumin. Fourth, use a decent power cable. Finally, if your preamp/amp permits, use the balanced outputs of the Lumin.

I thought those changes dialed the D2 in just great. I later added the Sbooster linear power supply, and heard solid improvements, namely much firmer and defined bass and lots more detail.

Very happy with the D2/Roon combo, such that I am not tempted to go to the T2.

I did compare even downloads to each other of the different websites where you buy them from. And also CD rips. The quality you get from the music you buy at Qobuz is often better than others. And also better than CD rips. I always compare and choose the best.

The AudioFacts Pro modification brings the D1/D2 to a superior level compared to the A1 and also T2. For a lot less money. We use superior parts even compared which ones are used on the A1. The A1 and D1/D2 share the same DAC. It was our goal to outperform the A1.

But we got even further. We have a client from Austria (who soon will write a review) and I will ask him if he wants to put it over here as well.

He had bought a Lumin D2 with a Pro modification and a modified Sbooster. This combo did cost him 3850 euro. He is a member of an audio club. He compared his combo with a 13500 euro network player from another member. And also he compared it with a 14000 euro Linn network player. He both outperformed them. The owners were very honest and admitted that his combo was convincingly better.

bo1972"The AudioFacts Pro modification brings the D1/D2 to a superior level compared to the A1 and also T2."

Caution that such alteration, adjustment, and modification will void  warrantee and may in fact render the component functionally and practically unrepaireable, unserviceable, and inoperative the manufacturer will tell you to "take a hike" if you you seek service or repair of such a modified unit.

The other problem is that these alterations are made without accounting for ICSS distortion which is something bo1972 has yet to fully comprehend because he thinks he has already isolated, identified, and accounted for all of the properties of the equipment he sells.

bo1972"The modified Lumin L1 is over 70% better compared to streaming by Qobuz. It also outperforms the Synology Nas on all aspects of sound.":

Yes but you will have no warrantee the manufacturer will reject, refuse, and disqualify all claims in the event of failure and often will not service the unit because they do not want to be responsible for alterations which are beyond their design, manufacture or control.