AKG K 550 MKII Dynamic headphones

With the K550s, AKG engineers have struck a masterful balance between the noise-isolating qualities of closed-back headphones and the spacious, dimensional sound of an open-back design creating reference-class headphones ideal for private listening both at home and on the go. 50mm drivers, the largest in our product line, deliver great AKG sound from your hi-fi system or virtually any portable device.The large ear cups and new headband design ensure an amazingly comfortable fit, and the 2D-axis mechanism folds flat to stow or go.

•     Semi - Open
•     Innovative bass refelx system
•     Rugged headband cosntruction
•     Single-sided coiled cable
•     Soft headband pad
•     Gold plated stereo mini jack (3.5mm) and 1/4" adapter
•     Transducer type: Dynamic
•     Frequency response: 5 - 35,000 Hz
•     Nominal impedance: 250 ohm
•     Nominal SPL : 96 dB
•     T.H.D: < 0.2%
•     Power handling capacity: 100 mW
•     Sound coupling to ear: Circumaural
•     Weight (without cable) 295 g

• Advanced build quality and engineering
• 40 mm drivers with rare earth magnets and copper-clad aluminum wire voice coils
• Tuned for enhanced low-frequency performance
• Circumaural design contours around the ears for excellent sound isolation in loud environments
• Convenient single-side cable exit

• Type: Closed-back dynamic
• Driver Diameter: 40 mm
• Magnet: Neodymium
• Voice Coil: Copper-clad aluminum wire
• Frequency Response: 15 - 20,000 Hz
• Maximum Input Power: 700 mW at 1 kHz
• Sensitivity: 96 dB
• Impedance: 47 ohms
• Weight: 190 g (6.7 oz), without cable and connector
• Cable: 3.0 m (9.8'), straight, left-side exit
• Accessory Included: 6.3 mm (1/4“) snap-on adapter

HSD 171 without cable

Professional headset with hypercardioid, shock mounted, speech optimized,
dynamic microphone. Main application: Live sound use. The microphone?s
frequency range is 60-17,000 Hz with a sensitivity of 1 mV/Pa (-60 dBV).
Impedance is 600 ohms. The headphone?s impedance is 55 ohms with an
audio bandwidth of 18-26,000 Hz. Type: supra-aural, closed-back with self-adjusting
headband. Microphone arm is swivelling through 270 degrees for left or right-hand
use with integrated mute switch.
Net/shipping weight: 255/725g (9/25.4 oz.)

The SRH1440 Professional Open Back Headphones provide full-range audio with detailed highs and rich bass in a sleek, attractive design. Made for mastering and critical listening, the premium padded headband with steel frame offers hours of listening comfort.

The included storage case, replacement set of velour ear pads, replacement cable, and threaded adapter ensure years of uninterrupted listening enjoyment.



40 mm Neodymium drivers deliver full-range audio with rich, controlled bass
Open-back, circumaural design for exceptionally natural sound, wide stereo image, and increased depth of field
Impedance optimized for direct connection to wide range of portable audio devices
Fully adjustable, premium padded headband with steel frame and sleek, ergonomic design for hours of listening comfort
Oxygen-free copper cable with Kevlar® reinforced jacket for superior performance and durability
Dual-exit cables with gold-plated MMCX connectors provide secure connection and detachability for easy storage or replacement
Replaceable velour ear pads with high-density, slow-recovery foam for exceptional comfort
Individually tested and serialized
Legendary Shure durability to withstand the rigors of everyday use




Type
Open-back, circumaural
Frequency Range
15 Hz – 27 kHz

Cable Length
6.9 ft (2.1 m)
Plug
Gold-plated 1/8" (3.5 mm) stereo mini-jack

User's Manual