HeadAmp 4 - Four Channel Headphone Amplifier

The ​HeadAmp4​ is a low noise, low distortion audio splitter and amplification box offering four 1/8th-inch (3.5mm) and four 1/4-inch (6.35mm) audio jack output sockets as well as one 1/8th-inch (3.5mm) and one 1/4-inch (6.35mm) stereo audio jack input socket. The new custom extruded metal case of the HeadAmp4 allows for stacking multiple HeadAmp4s on top of each other.

Ideal for virtually any auditory stimulation and ABR setup, the ​HeadAmp4​ easily adds additional headphone outputs to any mixer, computer audio interface, workstation, media player or laptop without creating any additional load on the existing headphone source.

Individual level controls for the four headphone outputs. The 1/4-inch (6.35mm) and 1/8th-inch (3.5mm) connections allow the HeadAmp4 to connect to virtually any source, and drive any headphone configuration including ER series from Etymotic Research (e.g. ER1, ER2, ER3C), Telephonics' TDH-Series Audiometric Earphones (e.g. TDH-39) or any combination of the above.

Features

• 1 Stereo 1/4-inch (6.35mm) & 1 Stereo 1/8-inch (3.5mm) Inputs (Wired Parallel)
• 4 Stereo 1/4-inch (6.35mm) & 4 Stereo 1/8-inch (3.5mm) Headphone Outputs
• 4 Output Channels Each with Individual Volume Control
• Can be Connected to Any Line-Level Source or Headphone Output

Technical Specifications

• Maximum Input Level: +14dBV
• Input Impedance: 90.9k Ω
• Maximum Output Level: +14dBu
• Maximum Gain: 20dB
• Output Impedance: 47 Ω (each output)
• Frequency Response: 20 – 20 kHz
• Signal To Noise Ratio: > 90dB (ref 0dBu)
• Total Harmonic Distortion: <0.01%
• IMD: (SMPTE) 0.01%
• Power: 12V DC (Adapter included)
• Dimensions: 47mm x 117mm x 104mm
• Weight: 0.61kg
• Notes: 0dBu = 0.775Vrms