I purchased this new and used it in my smoke free home studio. It has lots of input options and great sound. It worked perfectly with my Sennheiser HD800s headphones. It is in fantastic shape.
Thanks for looking!
George
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DiGiGrid Q Cube Headphone Amplifier Features:
High-fidelity headphone amplifier for recording, broadcast, and audiophile applications
Connects to DiGiGrid SoundGrid audio networks via Cat 5
Other connectivity options include AES/EBU digital input, RCA phono input, and Bluetooth audio streaming
Optimized for clear, powerful sound at any volume level
Suitable for all headphones up to 600-ohm impedance
DiGiGrid network devices can be networked up to 246' apart and can be connected to multiple computers simultaneously.