So it’s really hard to assign any percentages to anything, since their meaning can vary so much from person, some might see a 5% difference as very significant while others see it as unsubstantial. What I will say here is that the rnhp + bf2 combo brings the clear to enough potential to where if you decide to upgrade amps in the future, you will be spending a lot more in order to get the clear preform significantly better. So basically I think this setup has the best balance for price to potential of performance, getting higher is going to get unreasonable in cost quick.
So I think that there is a fair bit of room for improvement, you might find that it sounds good but somewhat restricted when it comes to spatial recreation, dynamics, and presentation to where that might make the experience somewhat underwhelming. Again this is one where it’s really hard to give a rating on potential or anything, but I would classify the sound of this combo as good enough, but not really showcasing what the headphones can do as much as swapping for the bifrost 2 will. I think swapping to that higher end dac will make a similarly big difference as upgrading your amp will.
Truly maxing out a headphone like the clear is really just super unreasonable to do. I would say that personally on my setups, I think that using something like my dual mass kobo 394 ii with my nagra hd dac + mps reasonably squeezed all I could get out of the clear, but that’s a really unreasonable and very poor value setup to where you would be much better off spending that money on higher end headphones and getting more reasonable electronics for those lol.
I would semi agree, I do think generally you get what you pay for, but that being said, that doesn’t mean that an amp that is a bit more expensive is going to be any upgrade from the neve. Let’s take an an amp like the flux labs fa10, which is a pretty solid amp, and in the us is around 750. That is about 250 more than the neve, but with the focal clear, I would still prefer the neve over the flux, mainly because I think it’s a better pairing. If you change the headphone to like a hifiman arya, I would greatly prefer the flux over the neve, so in the end it will come down to pairings. You really have to factor in synergy, which as you mention, the bottlehead crack + speedball is a really good pairing with the 6xx, and I would actually take a bottlehead over the rnhp with the hd6xx when it comes to listening enjoyment, but for a clear, the rnhp is a much much better match. There aren’t many amps that are under 1k that I would say have much better synergy with the clear than the rnhp, so that’s why I would say the cost of upgrading it is so high as you really have to make that jump to the 1.5k+ amp range to get a substantial upgrade to the neve that still has good synergy with the clear
I mean, that’s more a fancier looking but overpriced rnhp lol, so I don’t know if I would really celebrate that existing, the rnhp was the first product, and then they just decided to make a fancier looking one with a few minimal tweaks and charge more lol, def not worth the added cost