I replaced the pads on my AKG Q701 headphones today for the 4th time. It made me realize that I’ve used these headphones for at least 40 hours a week for 14 years straight. I’ve had to repair the left side speaker solder joint a few times, but they’re designed to be easily torn down and repaired. Truly BIFL headphones.
I’ve heard that the newer AKG K702 headphones are identical but I can’t vouch for that. They go for around $250.
They are 4-pin mini-xlr on my headphones. The Q701 had a 3 pin variant originally. Most headphones wire the ground wires from both drivers together. 4 pins instead keeps them separate. I can then use different cables to either keep them 4 pins or merge them again into three pin.
The reason for this is I have certain amps that only work with them being separated.