N-AUDIO HA400 Headphone amplifier 4 channel

INPUT:    1 audio stereo, 1Vpp/50kΩ on a 6.5mm stereo phone socket.
OUTPUTS:    5 audio stereo, 500mW/8Ω on 6.5mm stereo phone sockets.
AUDIO BANDWIDTH (-3dB):    25kHz.
CONTROL:    5 stereo output level controls (front), 1 mono switch (rear).
GAIN RANGE:    -60dB to +10dB.
S/N RATIO:    78dB.
THD:    0.08% @100mW.
POWER SOURCE:    12V DC, 370mA nom, 1A max.
DIMENSIONS:    16.5cm x 12cm x 4.5cm (6.5” x 4.72” x 1.77”) W, D, H.
WEIGHT:    0.68kg (1.5lbs) approx.
ACCESSORIES:    12V DC power supply.
OPTIONS:    RK-1 19" rack adapter.

HeadAMP - Four Output Stereo Headphone Amp Overview

Most home recordings involve from one to four people, any or all of whom are
going to need headphone monitoring. The monitor amp would be connected
to the tape deck?s headphone output or a mixer output so that the performers
can hear themselves and each other. Of course the same application can apply
to band rehearsals and even home entertainment. HeadAMP provides amplification
and individual volume control for up to 4 headsets. It can be driven by either line-
level or headphone amplifier signals (mono or stereo).

HeadAMP - Four Output Stereo Headphone Amp Specifications:

Signal To Noise Ratio >90dB
IMD (SMPTE) 0.01%
Maximum Input Level +14dBV
Maximum Output Level 20dB per channel
Output Impedance 51 Ohms per channel
Output Connectors Four stereo 1/4? headphone outputs
Power Requirements 12V DC (Adapter included) 
Total Harmonic Distortion

• Type: passive
• Number of channels: 2
• Number of inputs: 2
• Input connections: XLR Combo / 3.5mm stereo jack
• Input type: balanced/unbalanced
• Maximum input level: +20 dBu
• Input impedance: 10 kohms balanced/ 5 kohms unbalanced
• Number of outputs: 2
• Output connections: XLR/m, 3.5 mm stereo jack
• Output type: balanced/unbalanced
• Max output level: +20 dBu
• Output impedance: 600 ohms
• Frequency response: 10Hz - 40 kHz +/- 1 dB
• THD: 0,001 %
• Max. attenuation: 85 dB (attenuator), 112 dB (attenuator + mute)
• Controls: Attenuation, Mute, Mono
• Housing material: sheet steel/wood
• Housing surface: powder-coated
• Width: 164 mm
• Height: 62 mm
• Depth: 85 mm

The amPlug Twin rolls back the years to capture the sound of the legendary clean American dual speaker combo tube amp. Noted for its sparkling and sustained clean sound, this amp has been is widely used in many genres - rock, blues, jazz, country, and more. Raising the gain provides a powerful American tube overdrive sound. A stereo chorus effect is built into the amPlug Twin, adding natural spaciousness and depth to the sound. As you play these sounds, you're sure to forget the passage of time, and lose yourself in the tones loved by musicians in styles such as jazz, country, and blues.
Specifications

• Controls: Gain, Tone, Volume; STANDBY/ON/FX switch
• Terminals: PHONES Jack (stereo), AUX In Jack (stereo)
• Power supply: AAA batteries (x 2)
• Battery life: amPlug Twin (FX on):
• With zinc-carbon batteries: approximately 3 hours
• With alkaline batteries: approximately 11 hours
• Dimensions (W x D x H): 86 x 80 x 31mm/3.39" x 3.15" x 1.22“
• Weight: 40 g/1.41 oz. (not including batteries)
• Included items: AAA batteries (X2) (for verifying operation)

• Ultra-compact monitor headphone amplifier for studio and stage applications
• Personal \'\'more me\'\' mixer – mix a mic plus a monitor signal and hear them via headphones
• Flexible Mic In and Mic Through connectors plus Ground Lift switch
• Stereo Monitor input with dedicated Monitor Level control and Mono/Stereo switch

• High-power headphone output on 1/4\'\' and 1/8\'\' jack connectors
• DC 12 Vadapter included
• 3-Year Warranty Program*
• Designed and engineered in Germany