SR Lambda Pro
Type Electrostatic headphones
Transducer principle electrostatic, push-pull
Frequency response 8Hz–35kHz (no tolerance specified)
Sensitivity 108dB @ 1mW input
THD 0.001% at 95dB
Bias voltage 580VDC
Weight (headset) 15.1oz
SRM-1 MkII Pro
Type Headphone Amplifier
Inputs 1 x loop-through line-level input, rated 100 mV, 50 k Ohm
Gain 60 dB (1,000x)
Frequency Response Rated DC - 20 kHz, ±1 dB, at 30 V with one pair of SR-Lambda
Distortion Rated 0.05% THD at 100 V at 1 kHz while driving an SR-Lambda
Internal Wiring Super oxygen-free copper with giant crystals
Outputs 2 x headphone audio (plate) outputs, in parallel
Output Rated 370 V RMS maximum output at 1 kHz.
Voltage Rear-panel selectable 100 V, 117 V, 220 V or 240 V
Frequency 50 - 60 Hz
Power Consumption Rated 33 Watts
Dimensions 5.9"W x 3.4"H x 14.2"D
Weight 4.41 lbs.
The sound from these Lambda Pros is simply extraordinary. It is natural, clean, open, delicate, powerful, detailed, precise and revealing, all at the same time. There is no distortion. Every instrument, voice and multitrack layer is heard distinctly, never mushed into anything else. Instead of loud walls of crud, one hears everything separately, regardless of how loud you enjoy your music. The Stax SR-Lambda Professional electrostatic headphones are the most perfect audio transducer I have ever heard.