Beyerdynamic DT 108 50 ohm Single-Sided Headset (cable not included) Gray | Guitar Center
Beyerdynamic DT 770 Pro 250 ohm Closed-back Studio Mixing Headphones | Sweetwater
beyerdynamic DT 100 Closed-Back Studio Headphones - 400 Ohm - Vintage King
Headphone Impedance Demystified: Do I Need a Headphone Amp? - Headphonesty
Koss CS95USB Headset Mono USB Wired 32 Ohm 30 Hz 16 kHz Over the head Monaural Supra aural 8 ft Cable Noise Cancelling Electret Microphone - Office Depot