About the HiFiMAN EF2A
Add the magic of tubes to the sound of your music
Add the magic of tubes to the sound of your music
Plug the HiFiMAN EF2A into one of your computer's USB ports and prepare to be impressed. This compact digital-to-analog converter/headphone amp bypasses your computer's built-in DAC and audio circuitry — processing your digital music files outside the noisy environment of your computer for far better sound quality. The EF2A's vacuum tube headphone amplifier brings your tunes to life, imparting smoothness and clarity. You'll hear more dynamics and detail that you can really savor on your headphones. The EF2A also includes an analog audio input so you can enjoy improvements in sound with another music source. This is one component that looks so cool, you'll absolutely want to show it off on your desktop.
Product highlights:
- uses two 6J1 vacuum tubes for amplifier input stage
- Burr Brown PCM2702 digital-to-analog converter for high-fidelity stereo sound
- durable metal chassis and front plate construction
- external power supply included
- USB (type B) input for connecting to a computer
- supported sample rates: 44.1kHz
- input bit depth: 16-bit
- stereo RCA audio input
- full-size stereo headphone output
- recommended headphone impedance: 32-300 ohms
- signal-to-noise ratio: 95dB
- frequency response: 20-20,000 Hz (±0.2dB)
- output at 32 ohms: 3V, 320mw
- output at 300 ohms: 6.2V, 256mw
- 5-11/16"W x 3-1/8"H (including tubes) x 4-1/4"D
- warranty: 1 year
- MFR # EF-2
What's in the box:
- Headphone amplifier
- Two 6AK5 vacuum tubes
- AC adapter with attached 56" cord (16V/0.8A)
- 5' USB cable (with Type A USB on one end and a Type B USB on the other end)
- Owner's Manual
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Features
Overview: The HiFiMAN EF-2A is a hybrid USB headphone amplifier which combines vacuum tube sound quality with solid-state technology to deliver outstanding audio performance. The EF-2A has two inputs on the rear panel: a line-level CD input and a USB input. On the front, you'll find a 1/4" headphone jack, power switch, source switch (CD or USB), and rotary volume control. The EF-2A has a simple, but elegant, brushed aluminum faceplate and chassis.
Vacuum Tubes: The EF-2A uses two 6AK5 vacuum tubes (equivalent to the Chinese 6J1) at the input stage to significantly improve the condition of the source signal. The tubes have a flat frequency response and a high signal accuracy. The tubes are packed separately inside the box, so you will need to install them through the provided holes in the acrylic top panel. When installed, the tubes protrude approximately an inch.
Burr-Brown DAC: The EF-2A's USB input incorporates a Burr-Brown PCM2702E DAC (digital-to-analog converter) to improve the audio performance from your computer's headphone output. The DAC provides 16-bit/44kHz resolution, which is equivalent to CD quality.
Power Supply: The EF-2A uses an external power supply instead of one that is built-in. This keeps the size of the headphone amp small, and prevents noise generated by the power supply out of the chassis.
Key Components:
- Volume Control: ALPS potentiometer
- USB DAC Chip: Burr-Brown PCM2702E
- Vacuum Tubes: Chinese 6J1 x2 (6AK5)
- OP-amp: OPA2604
Specifications:
- Input Impedance: 47k Ohms
- Output Impedance: 32-300 Ohms
- Output: @32 ohms: 3 V, 320 mW; @150 ohms: 6.2 V, 256 mW
- Frequency Response: 20 Hz to 20k Hz (+/- 0.2 dB)
- Signal-to-Noise Ratio: 95dB
- Distortion: 0.2%
- Power Consumption: <15W
- Input Voltage: 16 volts AC, 500 mA
- Power Supply: 110/220 Volts
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