RA500 vs Adcom GFA-5300
The GFA-5300's power @ 8ω is 80W against the RA500's 150W, its signal-to-noise 100 dB against 105 dB, its power @ 4ω 125W against 250W, and its damping factor >300 against >200.
AI-generated product photo — not official manufacturer imagery.
RA500
AlesisAmplifiersPower AmplifiersDiscontinued
Estimated price (community-sourced)
$150
Around — community and catalog average, updates slowly
About the RA500
The Alesis RA500 is a high-performance stereo power amplifier ideal for studio monitors, live sound, and professional audio setups. It delivers 150 watts RMS per channel into 8 ohms in stereo mode and 500 watts RMS into 8 ohms in bridged mono mode, with 250 watts per channel at 4 ohms. The amplifier features a wide frequency response from 10 Hz to 70 kHz, low total harmonic distortion (0.5%), and a high damping factor of 200, ensuring clean, transparent sound reproduction. It incorporates a high-current toroidal transformer for stable output and uses a silent, convection-cooled design to avoid fan noise, making it suitable for quiet studio environments. Connectivity includes balanced XLR, 1/4" TRS, and unbalanced RCA inputs, with heavy-duty dual binding post speaker outputs. Front-panel LED meters provide output level monitoring, and built-in protection guards against overloading and overheating. The RA500 is rack-mountable and weighs approximately 13 kg, with dimensions of 480 x 143 x 272 mm. It is well-regarded for its robust build, reliable performance, and affordability in professional audio contexts.
Specifications
Power Specifications
Amplification power output and characteristics
- Power @ 8Ω
- 150W @ 8Ω
- Power @ 4Ω
- 250W @ 4Ω
- Damping Factor
- >200
- Minimum Impedance
- 4Ω
- Input Sensitivity
- 1.2V RMS
- Input Impedance
- 10Ω
Analog Output
Analog signal output specifications
- THD
- 0.500%
- SNR
- 105 dB
Connectivity
Input and output connections
- Bluetooth
- No
- Wi-Fi
- No
- Ethernet
- No
- Analog Inputs
- Balanced XLR, 1/4" TRS, Unbalanced RCA
- Analog Outputs
- Heavy-duty dual binding posts
Physical Dimensions
Size, weight, and appearance
- Dimensions
- 480 × 143 × 272 mm (W × H × D)
- Weight
- 13 kg (29 lbs)
Key Specifications
Power: 150W
Specifications are community-contributed and may not be accurate or complete. Verify all details with the manufacturer before making purchasing decisions. Terms & Conditions