Three Geek types: 1 - Geek, 2 - Super Geek, 3 - Super-Duper Geek
Two outputs on all types (2 x 3.5 mm jack): line and headphones, both are variable in digital domain (64bit precision)
Volume control: two buttons and software (Operation System main volume slider sends volume data to Geek which implements the volume change in its internal volume control)
Line-out output impedance: 47 Ohm (on all types)
Headphone output impedance: 0.47 Ohm (on all types)
Max output voltage (line-out and headphone): 2.65 Vrms (Geek), 3,4 Vrms (Super Geek), 4 Vrms (Super-Duper Geek)
Max output power (headphone, 16 Ohm): 450 mW (Geek), 720 mW (Super Geek), 1000 mW (Super-Duper Geek)
Native decoded music format in PCM: 44.1, 48, 88.2, 96, 176,4, 192, 352.8, 384 kHz / 16, 24, 32 bits.
Native decoded digital format in DSD: 2.822, 3.072, 5.644, 6.144 mHz / 1 bit
"Class A" analogue output stage, THD+N better than 0.005 %, SNR is 103dB (none-weighted), 109dB (A-weighted)
Sample rate indicator LEDs, machined aluminum enclosure in three different colors, with 6" USB cable, driver for PC (plug and play on MAC and Linux)
