Please do keep your ear to the ground for a used 3400 or a 2170.
I owned a Lyngdorf 2170 for 6 years and it is was fantastic. About 18 months ago I purchased a 3400 from a guy after he let me audition it in my room for about a week. How few 3400’s come up for sale is saying something positive, I think.
I think I saw the 7K one like you did. Yikes. $4500 might be a reasonable target for a very clean unit, loaded. I say might, because I coulda sworn I saw that the 3400’s MSRP was increased earlier this year. However, I recently saw something online that made me question that. I didn’t care enough to sort it out. Earlier this year I saw one for $4K but don’t recall if it was fully loaded.
I enjoy interacting with the 3400 over the 2170. The 1120 offers the same or possibly a better experience as it is a newer design and perhaps they made improvements. I don’t know. The diisplay is easier to see, remote does not require it be pointed at the amp. The Lyngdorf integrateds are all pretty much powered dacs with room correction. The newer models have a much more powerful digital engine with leads to better dac performance and quite possibly better room correction. There’s a trim function(tone controls on steroids) that allows you to select a specific LF and HF Hz and then boost it or cut it by up to 12bd (I think it’s 12db—short of going into my room to check that for accuracy). The Lyngdorf app that allows you to create custom curves (which I’ve not done), control the volume and power on the unit from anywhere in the house and set up a sub or pair of subs. Your sub is not in use currently, but the built in X-O’s give you control like you wouldn’t believe. It also streams, but I’ve not tried that as I’m utterly thrilled with my dedicated streamer.
Now, onto the 1120. You have a dedicated dac now. Is that correct? And you are ok with a unit that does not stream. You could install an 1120 that does it all in one box. Add a stereo amp of your choosing and you have a box-count of two. Finally, I know a dealer who carries Naim and Lyngdorf. He told me once that he drove Wilson Sabina X’s with an 1120 in a room full of customers (he does a vinyl nite) and they got along like a house on fire. His expression. He Loves loves the Nait 3. But also loves the 1120 and the latter sells like hot-cakes.
very best of luck