The SoundTube SA502 is a compact 2-channel Class D amplifier designed for commercial AV, background music, paging, digital signage, and small-zone audio systems.
The SA502 delivers 50 watts per channel at 8 ohms or 65 watts per channel at 4 ohms at less than 1% THD. It can also operate in bridged mono mode at 90 watts into 4 ohms, providing flexibility for a variety of low-impedance speaker installations.
Its compact 3.9" × 4.0" × 1.2" chassis and lightweight design make the SA502 useful where equipment space is limited, while balanced and line-level inputs provide connectivity for mixers, DSPs, media sources, and other professional AV equipment.
50W per Channel at 8 Ohms
The SoundTube SA502 provides 50 watts per channel into 8-ohm loads at less than 1% THD.
For 4-ohm speaker loads, output increases to 65 watts per channel at less than 1% THD, giving installers additional flexibility when designing small commercial audio systems.
90W Bridged Mono Operation
For applications requiring a single higher-powered amplifier channel, the SA502 can provide 90 watts in bridged mono mode into a 4-ohm load at less than 1% THD.
This allows the amplifier to be configured for either two-channel stereo operation or a single bridged output depending on the system requirements.
Compact Class D Design
The SA502 uses a Class D amplifier design in a chassis measuring only:
- 3.9" wide
- 4.0" long
- 1.2" high
- 0.56 lb
Its small footprint makes it suitable for commercial installations where a conventional rackmount amplifier would occupy unnecessary space.
Balanced and Line-Level Inputs
The SA502 provides input options for integration with professional and consumer-level audio equipment.
Input impedance is rated at:
- 47 kΩ for line-level input
- 600Ω for balanced input
This allows the amplifier to be used with compatible mixers, DSPs, audio processors, media players, and other AV sources.
Selectable High-Pass Filter
A selectable 120 Hz high-pass filter with a 12 dB-per-octave slope provides additional system configuration flexibility.
This can be useful when the connected loudspeakers or system design benefit from reducing low-frequency content sent to the amplifier outputs.
SoundTube SA502 Key Features
- Compact 2-channel Class D amplifier
- 50W per channel at 8Ω at <1% THD
- 65W per channel at 4Ω at <1% THD
- 90W bridged mono at 4Ω at <1% THD
- 20 Hz–20 kHz frequency response (-3 dB)
- Balanced and line-level audio inputs
- 34 dB maximum gain at 8Ω
- Selectable 120 Hz high-pass filter
- 12 dB/octave high-pass filter slope
- Signal-to-noise ratio greater than 83 dB at 50W
- Compact 3.9" × 4.0" × 1.2" chassis
- Lightweight 0.56 lb design
- 32V DC power requirement
- Suitable for small-zone commercial audio systems
SoundTube SA502 Specifications
| Specification | Details |
|---|
| Amplifier Type | Class D |
| Channels | 2 |
| Power at 8Ω, <1% THD | 50W per Channel |
| Power at 4Ω, <1% THD | 65W per Channel |
| Bridged Mono at 4Ω, <1% THD | 90W |
| Power at 8Ω, <10% THD | 55W per Channel |
| Power at 4Ω, <10% THD | 70W per Channel |
| Frequency Response (-3 dB) | 20 Hz–20 kHz |
| Maximum Gain | 34 dB at 8Ω |
| Signal-to-Noise Ratio | >83 dB at 50W |
| Line Input Impedance | 47 kΩ |
| Balanced Input Impedance | 600Ω |
| Input Sensitivity | 0.5V Line Input |
| High-Pass Filter | Selectable 120 Hz |
| HPF Slope | 12 dB/Octave |
| Power Requirement | 32V DC, 3.75A |
| Height | 1.2" (30.5 mm) |
| Width | 3.9" (99.1 mm) |
| Length | 4.0" (101.6 mm) |
| Amplifier Weight | 0.56 lb (0.26 kg) |
Typical Applications
- Background music systems
- Small commercial audio zones
- Classrooms
- Conference and meeting rooms
- Retail stores
- Restaurants
- Hotels and hospitality
- Digital signage systems
- Museums and exhibits
- Corporate AV systems
- Residential audio zones
Why Choose the SoundTube SA502?
The SoundTube SA502 combines 50W-per-channel 8-ohm operation, 65W-per-channel 4-ohm operation, 90W bridged mono capability, Class D amplification, and a compact chassis for installations where both amplifier power and space efficiency are important.
Its balanced and line-level connectivity also makes it easy to integrate into commercial AV systems using mixers, DSPs, and other audio sources.
Why Buy the SoundTube SA502 from Audio Supply?
Audio Supply provides SoundTube amplifiers, pendant speakers, ceiling speakers, surface-mount speakers, and commercial audio components for background music, paging, and installed sound systems.
Our team can help you select compatible SoundTube speakers and amplification based on speaker impedance, quantity, and system requirements.
