RA500

Power Amplifiers
Models: RA150, RA300 and RA500

Power your studio monitors, headphones, or home theater with Alesis Reference Amplifiers. Offered in three power categories, the RA series is quiet, efficient, and cool-operating for the demanding studio environment. The good looks and attractive prices simply add to the value of RA150, RA300, and RA500 amplifiers.

RA amplifiers provide more power and better performance at a lower cost-per-watt with crisp, clean signal. Designed for studio use, each RA amplifier incorporates advanced convection cooling for outstanding heat dissipation. The result is long, stable operation that is unaffected by heat-related complications, devoid of the noise of fan-cooling.

Whether you use RA series amplifiers to power studio monitors, headphones, or home theater speakers, you'll enjoy their reliable, consistent performance.

• Quiet, cool, efficient class AB power amplifier
• More power and better performance at a lower cost-per-watt than competitive amplifiers
• Crisp, clean signal
• Advanced convection cooling for outstanding heat dissipation
• Inputs: XLR3F, 1/4" TRS, RCA
• Switchable voltage (120/230 VAC)
• Front-panel volume controls

Size
18.9" W x 5.63" H x 10.71" D
(480mm x 143 mm x 272 mm)

Rack Units

3RU Height

Weight

28.5lbs = 13.0Kg

Rated output, per channel
4 ohms @ 1kHz, .02% THD+N
250 watts RMS per channel
8 ohms @ 1kHz, .05% THD+N
150 watts RMS per channel
8 ohms, bridged mono mode
500 watts RMS

Signal to Noise Ratio
105dB, 22Hz-22kHz bandwidth referenced to rated output

Frequency Response
10Hz – 70kHz +0, -3dB

Damping Factor
200

Slew Rate
60 V/μs (two channel), 120 V/μs (bridged mono)

Input Sensitivity
+4dBu (1.23 V) for rated output with input control at maximum

Maximum input level
+26 dBu

Input impedance
20k Ω, balanced, 10 kΩ unbalanced

Crosstalk 

85dB, 1kHz

All measurements done over a 20Hz-22,000Hz range with 1KHz sine wave at Full Scale, except for the dynamic range which was done with a -60dBFS 1KHz sine wave.