Hegel H160 -> Hegel H390 upgrade suggestion

Well, in addition to the power differential with the H390 you’re also getting overall higher parts quality in both the preamp and amp sections (don’t discount that as it’s huge), a much better DAC (if that’s even an issue), and apparently a smoother-sounding device, which is different.  Will it be significantly better to you?  I’d tend to think so but who knows?  My only point about the additional sub is you’ll most certainly experience improvements that would come at a much lower cost than an H390.  Which would be better or more significant to you in your room and system and for your tastes is an unknown.  I just wanted to bring the sub option up as another possibility you’d probably want to implement at some point anyway because two subs are just flat-out better than one.  If it was me I think I’d add a second F12 first (used if possible) and live with that for a while and see what that does for you, plus it’s much cheaper and may delay “the itch” to upgrade further for a while.  Plus, and as I mentioned earlier, you’ll likely wanna add a second sub anyway at some point so why not just start there?  Honestly, I don’t think you can go wrong either way, so it really comes down to a matter of budget and priorities. 
 

All that said and because I’m very good at making things more complicated, here’s a nice used H390 at a good discount that you could try, and if it doesn’t provide significant improvements you can just turn around and sell it for little/no loss. 
https://www.usaudiomart.com/details/650010507-hegel-h390-integrated-amplifier-excellent-condition/

And to make matters even more complicated, here’s an F12G SE for sale as well.  
https://www.usaudiomart.com/details/650006229-rythmik-f12g-se/

You must really hate me at this point, and I wouldn’t blame you. If I was to try to put lipstick on this pig I’d say you could buy both these used pieces for less than a new H390 alone with relatively little risk if either or both don’t blow you away.  Ok, I’ll leave you alone now but hope this at least gives you some useful things to think about. 

Apparently Hegel has tweaked their house sound a bit with the H390 (and H590) to skew a little smoother and less incisive so that’s something to consider. Here’s a review with some thoughts on the H360 versus the H390…

https://www.soundstagehifi.com/index.php/equipment-reviews/1365-hegel-music-systems-h390-integrated-amplifier-dac

You might also consider adding a second sub that’d likely bring sizable improvements and be around $5000 less expensive. Just another option to chew on FWIW and hope this helps at least somewhat.