First, off the Superlux HD-668 B are a great value for what you get. I recommend modding them for better listening sound and comfort. Mods: Added electrical table inside the cups covering the holes. This lowers the sound stage but not too much and helps control the sound. Removed paper inserts in the cups because not needed with 1st mod Removed foam inserts. Clears up the sound, helps to tame the treble somewhat, and also, bringing the mids forward. Replaced stock earpads with Tranesca leather Angled big overear earpads. This gives comfort over the...