The "German Maestro" brand (used to be MB Quart) is top notch gear
at prices between 300 to 500 Euros.
But for the BEST OF THE BEST it's AKG and Sennheiser and some more esoteric gear
which gets into the 3000+ Euros! Sennheiser had some STUDIO REFERENCE headphones
a few years back that were in the range of 25000 Euros. YES! Twenty Five THOUSAND Euros!
The quality and sound reproduction specifications were WAY BEYOND the German Maestros!
And that Sennhesier series SOLD OUT ALL OF THEM! which means some very rich music
people had NO ISSUE with spending 25000 Euros on a set of headphone that weren't even
encrusted with diamonds and gold! Just PURE AND CLEAR SOUND REPRODUCTION
were the goals of that premium set of Sennheiser headphones.
These days a TOP QUALITY ULTRA HIGH END SET will run about 3000 to 5000 Euros
where the THD (Total Harmonic Distortion) levels are BELOW 0.01% and where the magnets
are extra strong Neodymiums and platinum or osmium plating and alloyed silver/gold contacts!