Jeff, Thanks for your reply. It's great and I relate to and agree whole heartedly with the running a couple of tenths of a dB hotter being enough to persuade a listener that the difference s/he is hearing is a subjective improvement. But God are things confusing now - you'd think the world going digital would make it all cut a dried! Not so, I think purchasing audio equipment now (for those that want quality before convenience) is now harder than it has ever been. There are so many links in the digital chain (bit rates, sampling frequency, compression algs., transport protocols and bandwidth) and that’s even before we get into the DAC and post DAC side of the equation that it's a nightmare. So the answer, well just listen to it of course. BUT here's the rub, in a world where the independent audio reseller has gone to the wall in the face of consumers buying at cheapest price on line, you can no longer do that. Tottenham Court Road (London UK) was my childhood wonderland where I could audition anything and everything, hardly worth going there now. Even the B&O Centre I recently visited wasn’t really setup to make the most of the equipment there. They demo’d a pair of 18’s to me running Spotify through the Avent TV, and frankly the sound was not that great. In fact (highly subjectively), tweaking some equalisation (just a little) made by 8000’s back home sound just as good or perhaps even better. Everything today seems to being being sold on style rather than content. When my son an I auditioned a range of iPhone docks for his Christmas present, the sound from ALL of them (inc. Bose, Cambridge Audio, B&W etc) fell a long way short of the HiFi systems I was listing to back in the 70’s But no one seems to care. It’s pretty ain’t it!
I do wonder though when it comes to DACs there could be some sort of objective (if not the entire answer) solution in running the DACs into a reference ADC and then digitally comparing the results to see if that could yield any useful metrics?
Anyway, my son returns home from Uni soon and will bring back with him is FatMan Mi hybrid valve amplifier (valve preamp) (which for the price is an outstanding yummy piece of kit) and we’re going to see if the headphone output will allow it work as an alternative bluetooth/Dac for the BL 8000’s
Another bug bear I have is finding the right streaming audio service. I’m currently using Spotify/Mac, which for music content is great, BUT no means to select the output sound device, no equalisation, and no way to conveniently compare the premium service bit rate against the freebie… Grrrr!