Introduction In 2016 I attended a Head-Fi meet-up here in Toronto where I was exposed to all sorts of headphones and systems I had previously only read about. This was probably the last time I would have fun with the hobby for a long time, as I soon after set out on a 'no fun allowed' path, refusing to own more than one pair of cans, worshipping at the church of the HD650, and in general just having a pout on my face anytime anyone mentioned a headphone I didn't like (or thought I didn't like). Of course in hindsight, this was pretty dumb, and I did a good job sucking all of the fun out of the hobby for myself. This was the case until a little over a year ago, where burnout caused me to take a break from anything headphone-related entirely, and I began dabbling in two channel equipment. It was fresh and exciting, there was a lot to learn (truthfully there was a lot to learn with headphones as well, I thought I knew everything when I definitely didn't), and I started to have fun again. Through a few chance encounters I became very interested in vintage audio and started collecting old audio equipment, manufactured long before I was born. These experiences forever changed my approach to audio in general, and this year I decided to return to playing with headphones, with a focus on vintage and out-of-production models. This thread will chronicle my experiences with a few select models I have had the chance to own and hopefully serve as an inspiration for others who may find themselves a little bit bored with the state of the modern personal audio market. For members who have been around longer, some of this may be 'been there, done that', but please feel free to contribute your thoughts on any models discussed. Content Layout & Test Path I will try to update this thread every 1-2 weeks. For each headphone covered I will talk a bit about the history, model variations or other important information, and some short but sweet subjective impressions. My current system consists of a 2008 Mac Pro which feeds a tube-based S/PDIF converter over USB. S/PDIF is output to a TDA1541 DAC which in turn outputs to an OTL headphone amplifier based on the 6080 output tube. This amplifier works well with headphones of 80 - 600 ohm impedance, I plan to obtain a second amplifier later this year to evaluate headphones <80 ohms impedance. After many years of cycling source and amplification equipment, I am confident my headphone rig is the best it has ever been, and up to the task of evaluating the sound character of the headphones reviewed in this thread. Current Reviews Sennheiser HD540 Ref I 600 ohm - posted 9/26 Sennheiser HD250 Linear I 600 ohm - posted 9/29 Sennheiser HD540 Gold 300 ohm - posted 10/13 Future Reviews Sennheiser HD600 early production Sennheiser HD580 early production Sennheiser HD580 Jubilee AKG K240DF Stax SR-3 and SR-5 Beyerdynamic DT48S 200 ohm Beyerdynamic DT48S 25 ohm Beyerdynamic DT880 1985 edition Wishlist (loaners welcome!) Sennheiser HD560 Ovation I Sennheiser HD580 (made in Germany) Sennheiser HE60 Grado HP-1000 Achtung! Warning! The headphones discussed in this thread were designed and manufactured in a different era. Typically, they were not meant for the ultra-low output impedances of amplifiers which are popular today, and may have unsatisfactory tonal performance when paired with such. When reading the subjective impressions, keep in mind that they are valid only for the particular revision noted in the review (and of course, only for my own taste). Many of these headphones were produced over periods of several years and manufacturing changes were made more than once. In other words, your mileage may vary, but have fun!