Alesis RA-500 Reference Series Power Amplifier

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Alesis RA-500 Reference Series Power Amplifier
Alesis’ RA100 power amplifier has long been a favorite choice of musicians, hobbyists and professionals alike. Now Alesis extends the RA’s range throughout the recording and production spectrum with a bold new series of affordable amps in three distinct power ratings.

Designed for studio use, each RA series amp incorporates advanced convection cooling for heat dissipation. The result is long, stable operation unaffected by heat-related complications, without the added distraction and annoyance of fan cooling. And eliminating the danger of losing hard-to- hear details due to noisy amp performance.

Product Detail

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

Rack Units

3RU Height


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


85dB, 1kHz

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