ROLLS HR251 50 + 50 Watt Power Amplifier User Guide

June 6, 2024
Rolls

ROLLS HR251 50 + 50 Watt Power Amplifier

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.

ROLLS HR251 50 + 50 Watt Power Amplifier fig1 ROLLS HR251 50 + 50 Watt Power Amplifier fig2

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