Frequency Response: 
10 Hz-50 kHz, ±1.0 dB, any input to any output, gain control set to 50%
Voltage Gain:
(Gain, Loop, Out Headphone output) Bal. Line, -3dB, 34dB; HP Input, -1dB, 35dB 
Output Clipping Level: 
+18dBu m inimum with 600 Ω load
+16dBu m inimum with 300 Ω load 
Headphone Output impedance: 200 Ω 
Input Clipping Level: XLR:+24 dBu 
Dynamic Range: ≥120 dB (Balanced line inputs) 
THD + Noise: 
0.03% maximum(from 10 Hz–22k Hz @ +10 dBu input and output level, 300 ohm load, 10 Hz–22k Hz filter bandwidth) 
Inputs: 
XLR-electronically balanced, 22k ohm input impedance
1/4-inch unbalanced-9.1k ohm impedance
1/8-inch unbalanced-9.1k ohm impedance
Note: only one set of inputs (balanced or unbalanced) should be connected at a time 
Loop Output: Unbalanced, 200 Ω output impedance 
Internal Voltage Rails: ±15V, regulated 
Power: Internal: 
2 AA alkaline batteries, 12 hours life typical driving one 75 Ω headset; 
External: 5-17 VDC via threaded coaxial connector, (5.5mm outer diameter, 2.1 mm inner diameter), pin positive, sleeve negative. Voltages above 17 VDC cause no damage to unit, but will open an inter- nal poly fuse. Poly fuse will reset when voltage is removed. 
Power LED: 
Green indicates power and good battery, Red indicates power with low batteries. LED turns red when approximately 4 hours of battery life remain 
Operating Temperature Range: 0°-70°C (32°-160°F)
Dimensions (H×W×D): 43×94×140 mm(1.69"×3.7"×5.51")
Net Weight: (unit only) 0.56 kg, 1.24 lbs
Packaging: Colorful outer packaging