The S500 Stereo Amplifier

Static Power Consumption 270 Watts On
Standby power less than 2 watts
Operating Voltage Range 120/240V (Auto switching)
100V (Fixed)
Fuse 1/4"x1-1/4" 15A 250V Slow Blow
Input 2x XLR Input
Output 1x Binding post set per channel
Controls Gain switch
Input Impedance Switch
On/Off Button
Standby button
Display Dimmer
12V Mode Switch
2x MSB 12V trigger port
Continuous Power Output (8Ω) < 1% distortion 500 W
Continuous Power Output (4Ω) < 1% distortion 900 W
Frequency Response (20 to 20kHz) ±0.025dB
Signal to Noise (20 to 22kHz) >136dB (>140dBA)
Equivalent Input Noise (22kHz BW) 0.5μV
Crosstalk @ 2kHz <-110dB
Low Gain (75Ω source impedance) 16.2dB
Medium Gain (75Ω source impedance) 22.2dB
High Gain (75Ω source impedance) 28.2dB
Input Impedance (User Selectable) 75Ω / 300Ω / 1.2kΩ
Output Impedance (20 to 20kHz) 0.07Ω


Input/Gain Stage - Class-A
- Double balanced
- Impedance matched
- Fully discrete
- Independent power and transformer
Output Stage - Class-AB
- Balanced
- High bias
- Current gain only

Chassis Dimensions

Width: 15 in (381 mm)
Depth: 23.25 in (590 mm)
Height: 10.5 in (267 mm) Without Feet
11 in (279 mm) With Feet
Weight: 135 lbs (61.25 kg)
Product Feet: M6X1 Thread
3 or 4 Foot Configuration

Shipping Dimensions

Width: 23 in (585 mm)
Depth: 35 in (889 mm)
Height: 21 in (534 mm)
Weight: 194 lbs (88 kg)

Included Accessories

User Manual
IEC C19 Power Cord

The MSB S500 Stereo Amplifier