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Professional Monitoring Headphones

The HD660 is a closed dynamic headphone for the most demanding professionals. 
The accurate sound profile and comfortable headband make the HD660 the perfect monitoring 
headphone for recording studios, post production or broadcasting applications. 
With a carefully tailored frequency response, the HD660 offers an excellent clarity 
of sound with a natural and balanced character. Soft earpads and adjustable, sliding
earpieces, together with a single-sided connecting cable, ensure listening comfort 
during long term use. A durable plastic storage box ensures secure protection during transportation.

• Dynamic, closed-back headphones
• Natural and well-balanced sound profile
• Ultra-detailed high and mid-range reproduction
• High noise attenuation
• Durable headband construction with optimized pressure
• Single sided cable

Type:Dynamic, Closed-back
Driver: F40mm, neodymium
Sensitivity: 96dB SPL (1mW)
Frequency Response: 10–30,000Hz
Max. Input Power: 100 mW
Rated Impedance: 150 O
Earpads: leatherette
Cables: 3-meter (9.8 ft.) coiled, single-sided cable
Connector:Screw-on gold plated stereo mini plug
Headphone Caliper Pressure: Approx. 6N
Weight (with cable):250 g/ 8.8 oz

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