I realised quickly after watching more reviews that the K7 (K7 BT too since they are the same) has one major flaw for my use case, the ring LED around the dial cannot be turned off and appears quite distracting, I use my workstation in dim lighting a lot and like that on the Toppings you have a display off/auto off and dim levels, so bright LEDs to me would be an annoyance, Schitt had that on their old HP amps too but in the later models changed it to an internal LED that glows through the top vents which is kinda cool. So the K7 is off the list for me and I am looking at either the Magni Unity with the DAC board along with the Pyst cables from them to RCA up to the Topping MX3s.
Some reviews rate the Magni Unity as end game too as a pure HP amp so I think I'd be fine with that as a higher powered HP amp vs the MX3s I have currently which is primarily used for the passive speakers and for that purpose I don't think it can be beaten given its sub £200 price and it smashes audio better than the £800 and £640 NAD Class D amps I had previously.
I also like the look of the Asgard 3 with the multibit DAC card, though it's a bigger unit and I only want it in black, and annoyingly the black comes with a silver volume knob.... WTF is this Schitt??? They have black volume knobs for sale but only for the Magni class products, none for the Asgard, so based on that alone I do not want to buy an Asgard as the knob just looks whack being silver when the rest is black.
The Magni Unity with the DAC card option comes to $189 which is rather excellent and I can stack it on top of my Topping so desk space is retained
I don't mind spending a bit more hence why the Asgard was considered, but the aesthetics must tick my use-case boxes like how Topping does really.
This has whole saga also made me realise how companies like Topping can make an all in one amp so well (MX3s) and yet fall short on later "Pro" models with missing features or issues. I'll likely be keeping the MX3s for life for as long as I am using passive speakers, this little thing sounds so clean and full of life and has a capable headphones amp unless there's a desire for more power if you have headphones that scale each time you feed them more power like the Senn HDs.