Sjöström Audio

http://www.moxtone.com
Lot's of audio stuff but only a few pages in english, the rest are in croatian but you could always email the author.
https://www.passdiy.com
Here are lots of goodies from Mr. Nelson Pass for the DIY-guy. Lots of amp designs.
http://arkiv.nrk.no/nordlandsbanen
This is something for the train lover. 4 x 9 hours cab rider's view filmed in HD. They have filmed in winter, spring, summer and autumn and you can also see all four seasons at once.
http://sjostromaudio.com/pages/index.php/hifi-projects/127-qrv06-headphone-amp
Click on the pictures to get a larger view.   The performance is very good. See the technical data! Interesting features: Extremely low distortion, approx: 0.00046% Extremely fast, > 25 MHz, 3000 V/µs The pcb fits virtually any SOT23 small...
http://sjostromaudio.com/pages/index.php/hifi-projects/132-qsxm2-the-extreme-phono-riaa-amplifier
QSX Mark II - The extreme phono (RIAA) amplifier   Click on the picture to get a larger view. The front view of the original QSX Amplifier from 1986. Click on the picture to get a larger view. The top view of the QSX Amplifier pcb. High...
http://sjostromaudio.com/pages/index.php/hifi-projects/117-jsr06-sjoestroem-super-regulator-power-supply
Click on the pictures to get a larger view. Some background can be found in my JSR-01 project. This design is based on my JSR-01 project and the goal was to make the pcb with hole mounted parts as small and versatile as possible. The design The...
https://www.akm.com/akm/en/
This firm manufactures extremely high performing ADC's and DAC.'s They belong to the elite in the business. To my knowledge they make the most extreme DAC in the world (at the moment). Check out the AK4497!!
http://www.nacl.de/capaciti
Do it yourself electrostatic loudspeakers. The website is in german only but you can use Google translation service.
http://www.grimmaudio.com
Grimm Audio is a collaboration between four of the Netherlandsª¾ best known audio engineers: Bruno Putzeys, Guido Tent, Peter van Willenswaard and Eelco Grimm, with the explicit aim of consolidating their collective competences into the most transparent...