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INTRODUCTION
Thank you for your purchase of the HA43Pro Reference Head-
phone Amplifier. The HA43Pro drives up to four pairs of stereo
headphones for high qualituy audio monitoring. The unit is intended
for sound reinforcement, studio, choir, install, and other applications
where a smaller size is desired without sacrificing audio quality.
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SPECIFICATIONS
Input Impedance: 100k Ohms unbalanced
Max Input Level: +14 dBV
Input Connectors: TRS Stereo 1/4” phone, Dual RCA
Outputs: 4 TRS Stereo 1/4”, 4 TRS Stereo 1/8” (3.5mm)
Output Impedance: 51 Ohms each output
Max Gain: 20 dB/Channel
r o 4 C h a H n A n
S/N Ratio: >90 dB
THD: < .008%
IMD (SMPTE): <.008%
Power: 12 VDC (Rolls Model PS27)
Weight: 1 lb (.45 kg)
Size: 4.15 x 3.45 x 1.16 (W x H x D)
p m A e n o h p d a e H o i d u t S . h C - 4
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DESCRIPTION
INPUTS: 1/4” Stereo TRS jack, and Dual RCA jacks for connec-
tionto the stereo line-level signals to be monitored.
12 VDC PWR: Connects to the Rolls PS27 12 VDC (outside of the
barrell positive) adapter.
CHANNEL LEVELS: Sliders 1 - 4 adjusts the level of the indicated
channel.
OUTPUTS 1 - 4: 1/4” and 1/8” (3.5mm) TRS stereo jacks for con-
nection to headphones or earphones.
WARRANTY INFO
ranty information and registration.
HA43 Pro
4-Channel Studio Reference
Headphone Amplifier
The HA43 Pro is a full frequency response four
channel headphone monitoring device designed
for the recording studio, or other professional
applications like listening rooms and monitoring
stations. Each output boasts a whopping 20 dB of
clean channel gain.
SCHEMATIC
• Stereo 1/4” and Dual RCA Inputs
• Slider Volume controls
• AC adapter included
• Full frequency response
• Lots of output level.... it’s loud!
Rolls Corporation
Salt Lake City, UT
9/06
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