The 2170 is not obsolete. It is a perfect amplifier.
I am also using a 2170 with a USB module in it. The 2170 is via USB connected to a Synology DS920+ NAS (DSM 6.2!) with Roon Core running. No problems whatsoever.
In DSM7 USB audio is not longer supported. So I am thinking of buying a Raspberri Pi 4 as Roon endpoint:
DS920+(Roon Core) -->(ethernet) Raspberry Pi 4 -->(USB) Lyngdorf 2170
The TDAI-2170 is without native support of Roon and I think is out of production.
I already had doubts about the missing of Roon support but now that I see that exists the 1120 and the 3400, with support, I think I will avoid the 2170 at all.
I already own a Pi 4 with RoPieee on board, but, I guess it’s better to have everything on-board.
I really doubt about the power of the 1120, even if it could go well with my speakers, in a room of 4,5x4,5m, I will always the wish to prove the 3400, so… I am looking to test the 3400.
My country dealer seem that don’t have the unit immediately (unlike the 1120).
BTW, for you both owners of RoomPerfect, did you compare the results to Dirac Live?
Actually I have a Roksan K3 with miniDSP DDRC-24 with Dirac 3: according to you, I will have an effective update with the RoomPerfect on the 1120 or the 3400?
I used Dirac on a NAD M10 and RP on the 1120 during my evaluation.
The M10 sounded good but the 1120 and RP won quite easily on both ease of use for correction and sound quality.
Not quite the same, but I’ve used Dirac Live on my Arcam AVR850, but changed to RP on my Lyngdorf 3400 after an extensive home trial of the 3400 and 2170. In my room and on my system, RP has proved far superior to Dirac.