Audio-Technica ATH-M20x Professional Studio Monitoring Headphones + FiiO A1 Headphone Amplifier

• 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
• Designed for studio tracking and mixing

Product Specifications:

• 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

Please note: Includes Both the Standard 3.5mm Headphone Jack Adapter and a 6.3mm (1/4") Screw-On Adapter.

A new generation: exquisite design, improved operation

The A1 utilizes a sandblasted aluminum alloyed chassis for a durable modern appearance and comfortable handholding. A transparent removable back clip adapts the A1 to different usage scenarios in style.

Plug-and-play instant audio improvement

With higher power hi-fidelity output than smartphones, the A1 satisifies your need for more sound quality and quantity

High quality electronic volume control

The A1's volume buttons are made of Alps microswitches for sensitive and reliable operation.

• VOL+: Press briefly to increase volume by one step, hold to continue increasing volume.
• VOL-: Press briefly to decrease volume by one step, hold to continue decreasing volume.

Four EQ modes for maximum flexibility

The A1 provides Flat, Bass1, Bass2 and Bass3 EQ modes, switchable simply by briefly pressing the power button, allowing you to best adapt the sound output to your earphones and your ears; moreover the indicator light clearly indicates the present EQ modes.

• EQ modes:
  Blue LED on continuously: Flat EQ
  Blue LED flashing once every 2 seconds: Bass1 EQ
  Blue LED flashing twice every 2 seconds: Bass2 EQ
  Blue LED flashing thrice every 2 seconds: Bass3 EQ

Product Specifications:

• Model Name/Number: A1 
• Color Available: Silver
• Weight: 20g (incl. belt clip) 
• Dimensions: 42mm x 40.7mm x 9.4mm
• Audio Input: Standard 3.5mm Port 
• Headphone Output: Standard 3.5mm Port
• Drive Ability: 16~100 ohm (recommended) 
• Power Input: DC 5V/0.8~1A (recommended)
• Battery Capacity: 160 mAh 
• Battery Life: >/=13 h (32ohm loaded)
• Output Power: >/=78mW(16ohm / THD+N<1%) 
• Charging Time: 90 mins
• THD+N: <0.05% (1kHz)  
• Output Impedance: </= 0.2 ohm
• Frequency Response: 10 Hz~90 kHz(-3dB, Input: 300mV) 
• SNR: >/=100dB (A-weighted)
• Input Sensitivity: 1.05Vrms(Vol=Max) 
• MAX input Level: 1.35Vrms
• Crosstalk: >/=65 dB 
• Channel Imbalance: </= 0.2dB
• Gain: 3.65dB 
• Status LED: Yes
• MAX Output Voltage: 4.52Vp-p 
• MAX Output Current: 50mA
• EQ Modes: Bass1: 2.7dB bass boost; Bass2: 5.2dB bass boost; Bass3: 5.2dB bass reduction 
• MCU: MSP430
• Headphone AMP: TPA6130A2 
• Sound Effects Module: 74HC4052PW+OPA2322AID