Filled the cups with some amount of cotton wool to improve image coherency. (An extra tweak might be to put pantyhose in there as well to try keep strands of cotton from poking through the grille.) Tuned the EQ slightly both by ear and, in the 200–1000 Hz range where measurement and perception tend to correlate most, graph.
I'll adapt some words by AKG to describe the sound.
The modified HOK 80 superior reference headphones offer the most pure and natural sound possible. The modified HOK 80 empower to experience the smallest sonic details with the most accurate balance.
The modified HOK 80 transducer is the largest KWH has ever built. The transducer was developed to push the boundaries, to get as close as possible to sonic perfection.
With the ultra-lightweight voice coil a superior impulse response and an extended frequency range is guaranteed.
The modified HOK 80 provides the most precise and powerful experience possible.