Amplifiers Manuals



Grapevine  HeadAmp 4
designed by
HeadAmp 4 
Key Features
Technical Specifi cations
The HeadAmp 4 is a high-quality Class A headphone 
• High-quality, discrete Class A headphone amplifi er 
Connectors:  
balanced 1/4“ TRS
amplifi er designed for  a wide variety of studio and live 
circuits
Input level:  
+21.2 dBu (input -12 dB)
applications. Next to the classic multi-headphone situa-
•  Will also power low-impedance headphones 
Input impedance:  
10 kOhm
tion for recording, the HeadAmp 4 is also ideal as a:
•  Handles even extremely high input levels, e.g. from other 
Output impedance:  
50 Ohm
•  Reference studio amplifi er
headphone outputs
Output voltage:  
600 Ohm/7.4 Veff
• Perfect alternative to low-quality amplifi er stages in 
•  Exceptionally low noise and distortion, especially at low 
                                
300 Ohm/7.1 Veff
sound cards and entry-level consoles
impedances
                                
150 Ohm/6.6 Veff
•  Active line-level signal distributor
•  Switchable input sensitivity
                                  
50 Ohm/5.3 Veff
• Four output modes: Stereo, Left Channel Only, Right 
Frequency response:  
10 Hz-100 kHz (-0.5 dB)
The HeadAmp 4 is built in Germany to SPL standards for 
Channel Only, Mono
THD+N:  
› 95 dB
years of trouble-free service, using:
•  Rear-panel connectors for daisy-chaining multiple units
Noise:  
› -90 dBu
• Internal power supply with standard IEC connector for 
CMRR:  
› 80 dB
easy, secure AC connection
Output resistance:  
10 Ohm
•  Highest quality potentiometers and switches from ALPS
Fuse:  
125 mAT
•  Double-sided PCB for maximum durability and contact 
Power supply:  
block transformer, 5 VA
reliability
Dimensions:  
19 inch, 1 U rack space
•  Rugged metal casing
Weight:  
4 lbs
SPL USA · 2498 Rikkard Dr. · Thousand Oaks, CA 91362. For further information call 805 241 5140, fax 805 435 7455, email [email protected] or visit www.spl-usa.com 


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