Top of the line Creek OBH-21 SE (Special Edition) headphone amp / pre-amp with upgraded power supply (OBH-2) and original instructions manual.
It has 2 inputs, one each for low and higher impedance headphones. So, it will drive almost any dynamic headphones you may have.
It is in great condition. I have a handful of dedicated headphone amplifiers and this is the unit I used to drive my Sennheiser HD 600, which are fairly high impedance headphones and not the easiest load for an amplifier.
I just don’t listen to headphones anymore as I work from home now and it’s not getting used, so I’m letting it go to someone else. Altogether, it was around $500 new.
OBH-21SE Special Edition compact headphone amplifier
Premium parts used throughout construction
High-current, low-noise OBH-2 external power supply
Accommodates two pairs of headphones
For line-level input from CD players, preamps, etc.
High-quality front-panel volume control
Two high-quality front-panel headphone jacks
Rear-panel RCA jack input (x 1) and output (x 1)
Rear-panel on/off switch
Front-panel power indication LED
Metal chassis with stylish aluminum front panel with a silver finish