Today I tested two amplifiers, the Cocktail Audio HA-500 and the Sennheiser HDV820.
headphones in test:
FA D8000 Pro
Hifiman Audivina
Denon AH-D9200
Meze Elite
HD800s
HD820
Focal Utopia
Focal Stellia
What can I say? The HA-500 has a tube stage and allows you to use it in hybrid mode (with the tube stage on or off by pressing a button). It sounded full, pleasant and a little bassy in a good sense. What it lacked was dynamics. Busy musical passages clearly illustrated this shortcoming to my displeasure, as on the whole I liked this amplifier.
However, it was the Sennheiser HDV820s that surprised me the most with its clean, punchy and articulate sound. It was like a breath of fresh air after spending a long time in a smoky room with the HA-500. However, two problems left me scratching my head. Mid tones lacked a bit, voices sounded slightly recessed, and the overall sound had a slight metallic tinge, typical of Senn, I must say.
So, I ended up being dissatisfied with both.
As far as headphones go, the Utopia were again the most versatile and capable, the FinalAudio and Denon also performed very well. However, the Meze Elite and Focal Stellia were the big disappointments for me. I wonder why some people like the Meze, very overpriced for what you get.
The Audivina was the most unusual of all as it shone with the HA-500 like no one else, leading me to conclude that Hifimans love tubes more than anything else.
Denon performed fairly well too but had sometimes too much bass, especially with a tube stage on.
Both Sennheisers, while being technically perfect, never managed to impress me. For me they lack life, bite, emotions. I liked HD820 better compared to its open back sibling.