TECHNICAL SPECIFICATION
Receiver
Frequency Range: 500 - 980 MHz
Audio Output: Unbalanced Max output +5 dBu
Power Supply: 12-18VDC
Power Consumed: 150 mA@13.SVDC
Receive Sensitivity: <-90 dBm
500 980 MHz

Handheld Transmitter
Frequency Range: 500 - 980 MHz
RF Power: 10 mw
Battery: 2. x AA size battery (1,5V)
Frequency Response: 50- 20,000 HZ
Input Sensitivity: 2.1 mv/Pa
Power Consumed: 1 0mA @3V

System
T.H.D. (Overall): <0.1%
Signal to Noise: =96 dB (A)
RF frequency range: 500 - 980 MHz
Modulation: DQPSK
Bandwidth: 300kHZ
Dynamic Range: >90 dB (A)
Audio sampling: 24 bit/48 kHz
Transmission system: PLL synthesizes
Audio Delay: 3 ms
Audio Encoder: PT Live
Frequency Respoonse: 20 -20,000 Hz 
Working Distance: 200 Feet

Superlux HD681 EVO BLACK

HD681EVO
Professional Monitoring Level Headphones
The best-selling model HD681 is a high quality headphone with rich bass, 
crystal clear high resolution and accurate sound field positioning. 
Now the new HD681 EVO upgraded version has a completely new, 
more slender shape and an improved smoother, more neutral, treble tone. 
The HD681 EVO easily meets the requirements of stage and studio professionals 
for a high-quality sound in monitoring headphones.

Type: Dynamic, Semi-open 
Driver: ø50 mm, neodymium 
Sensitivity: 98 dB SPL (1mW) 
Frequency Response: 10-30,000 Hz 
Maximum Power: 300 mW 
Rated Impedance: 32  (copper-coated aluminum wire) 
Earpad: Leatherette 
Headphone Caliper Pressure: 3.5 N 
Cable: Detachable 1-meter(3.3 ft.) & 3-meter (9.8 ft.) 
straight, single-sided; plugin cable on headphones(mini stereo connector) 
Connectors: Gold plated stereo mini plug 
Net Weight (without cable): 265 g (9.3 oz) 

Furnished Accessories 
• 1-meter straight cable 
• 3-meter straight cable 
• Cable clip 
• Gold-coated 3.5 mm to 6.3-mm stereo adapter 
• Soft carrying pouch 

Optional Replacement Part 
EPK681 EVO-L leatherette ear pad kit 
EPK681 EVO-V velvet ear pad kit (Includes a pair of ear pads and a pair of foam disks)

New styling and more slender design, plus an improved smoother, more neutral, treble tone
50 mm large-diaphragm speaker unit to reproduce accurate sound and large dynamic 
Semi-open acoustic design 
Aural design provides natural sound, able to maintain a comfortable feel during prolonged use 
Self-adjusting headband provides the best fit 
Detachable, single side cable 
Optional two colors: black and white