LD SYSTEMS HPA 4 Compact HEADPHONE AMPLIFIER 4 CHANNELS

• 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

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.

Specifications
General

Frequency response
    

 
    

20 Hz - 20  kHz (+0 dB, -1.5 dB)

Signal-to-noise ratio
    

 
    

100  dB (IHF A-weighted, input level control min.)

Channel separation
    

 
    

80 dB between adjacent channels

Line input
    

 
    

Front: 6.3 mm jacks, unbalanced
Rear: RCA connectors, unbalanced

   Input impedance
    

 
    

40 kOhm

   Nominal level
    

 
    

-10 dBV (0.3 V)

Headphone outputs
    

 
    

four 6.3 mm stereo jacks

   Maximum output power
    

 
    

2 x 1.5 W at 8 Ohm (1 channel in use)
2 x 1,2 W an 8 Ohm (four channels in use)

Power supply
        

230 V AC, 50 Hz

Power consumption
    

 
    

10 W

Dimensions (W x H x D)
        

482  mm x 44  mm x 196  mm

Weight
    

 
    

4 kg

MyMONITOR - Personal Headphone Monitor Mixer Overview

Problem: A performer needs to hear him/herself through headphones exclusively or mixed
with the output of a mixer, CD player, tape deck, or other stereo line level source. Only the
mic signal, however, should be going to the main mixer.
Solution: Connect MyMONITOR between the mic and line source, and the mixer. The Mic
and line Monitor levels can then be adjusted for mix and volume through the headphones.
Only the mic signal will go to the board. And since MyMONITOR can be AC or battery powered,
the unit can be used on a large stage or wherever there is no AC outlet nearby. Dynamic or
condenser mics can be used since phantom power would come through the Mic Thru jack from
the mixer or other source.

MyMONITOR - Personal Headphone Monitor Mixer Specifications:

Signal To Noise Ratio 90dB
Gain 15dB (1/4 in), 50dB (XLR)
Maximum Input Level -20dB mic, 40dB Monitor
Output Impedance 10 ohms
Power Requirements 12V DC (Adapter included) or one 9V battery
Phantom Power ON/OFF switch
Power LED indicator
Dimensions 4.5x2.75x1.5 inches (112mm x 72mm x 40mm)
Weight 1.3lb (590g)

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