ROLLS HR251 50 + 50 Watt Power Amplifier User Guide
- June 6, 2024
- Rolls
Table of Contents
ROLLS HR251 50 + 50 Watt Power Amplifier
CONNECTION
To operate the HR251, properly connect cables from a source to the RCA or XLR channel inputs of the HR251. Connect the HR251 outputs to speakers 4 Ohms or higher impedance. Adjust the channel level controls for the desired volume.
NOTE: THIS MANUAL ASSUMES THE USER HAS A WORKING KNOWLEDGE OF AUDIO ELECTRONICS, BALANCED AND UNBALANCED CONNECTIONS, AND PROPER SIGNAL LEVEL SETTING.
DESCRIPTION
The HR251 is a dual-channel, 50 watt, power amplifier designed for audio and visual professional applications. An FR4(V94-0) rated glass epoxy circuit board and powder-coated steel chassis, make the HR251 a product that will last. Inputs are stereo RCA and XLR at line level. The HR251 has Plugable Phoenix connectors for outputs.
What’s in the box?
1 – Made in USA HR251
1 – 24V power supply PN KSU100
1 – This owners manual
SPECIFICATIONS
Input Impedance: 10K Ohms RCA 10K Ohms XLR
Power Output: 50 Watts X 2 (4 Ohms)
Voltage Gain: 30 dB
Maximum Supply Voltage: 24 VDC
THD: .05% typical
EIN: 3 mV
Efficiency: 87%
Input Sensitivity: 28 mV
Bandwidth: 20Hz – 25 kHz +/- 3dB
Size: 6.5″ x 4″ x 1.5″
WARNING: THE MINIMUM SPEAKER IMPEDANCE IS 4 OHMS EACH.
IF YOU CONNECT AND USE THE HR251 WITH A LOWER SPEAKER IMPEDANCE THAN 4 OHMS
YOU WILL DAMAGE THE HR251 AND POSSIBLY OTHER EQUIPMENT THAT IS CON-NECTED TO
THE OUTPUTS.
