Sennheiser HD650 (320 Ohm) with Burson V5i Opamp

The sound quality has noticeably improved, with enhanced detail across the entire frequency range. Every note feels more defined, and the overall clarity has taken a significant step forward. The preamps, in particular, have left a strong impression with their ability to bring out subtle nuances in the audio. It’s clear that they contribute to a richer, more immersive listening experience.