Soundtube SA502 Channel Class D Amplifier
Soundtube SA502 Channel Class D Amplifier is backordered and will ship as soon as it is back in stock.
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Soundtube SA502 Channel Class D Amplifier
SoundTube SA502 2-Channel Class D Amplifier
The SoundTube SA502 is a compact 2-channel Class D amplifier delivering 2 x 50 watts of clean, efficient power for low-impedance speaker systems in commercial and residential distributed audio installations. Weighing just 3.1 lbs in a chassis measuring 1.2" H x 3.9" W x 4" D, the SA502 is one of the smallest 2x50W stereo amplifiers available for professional use, making it ideal for concealed installation inside millwork, behind displays, inside ceiling cavities, or in compact equipment rooms. A rugged aluminum housing provides durability and heat dissipation without the need for a fan.
The SA502 offers three operating modes: stereo, mono summed, and bridged mono (delivering up to 100W into a single load) — selectable via the rear panel. Three user-selectable input options include balanced stereo (Euroblock), unbalanced stereo mini-jack, and high-level Euroblock, covering virtually any source component or zoning architecture. A 120 Hz high-pass switch protects speakers from low-frequency overload in systems where the SA502 is paired with a separate subwoofer channel.
An external 12–32V trigger input enables auto-on/off integration with control systems and zone processors. Signal-detecting auto standby further conserves energy during idle periods. Dual concentric gain controls allow independent channel level adjustment while preventing unauthorized tampering in public installations. The SA502 ships with a 3-pin Euroblock, 4-pin Euroblock, mounting hardware, power supply, and stereo RCA adapter. Certifications include CE, RoHS, UL60065, ETL-C/US, and FCC.
Key Features
- 2 x 50W Class D Output — High-efficiency Class D topology delivers clean stereo power with minimal heat generation and low quiescent draw.
- Three Operating Modes — Stereo, mono summed, and bridged mono (100W) provide versatile configuration for diverse speaker loads and room sizes.
- Three Input Options — Balanced Euroblock, unbalanced mini-jack, and high-level Euroblock cover virtually any source device or zone controller.
- 120 Hz High-Pass Switch — Protects speakers in systems with dedicated subwoofers, eliminating low-frequency stress on satellite drivers.
- 12–32V Auto-On Trigger — Integrates seamlessly with Crestron, AMX, Savant, Control4, and other control systems for zone-based power management.
- Signal-Detecting Auto Standby — Automatically powers down during silence to reduce energy consumption in always-installed commercial environments.
- Dual Concentric Gain Controls — Independent channel level adjustment accessible to technicians, with recessed design discouraging unauthorized tampering.
- Ultra-Compact Aluminum Housing — At 1.2" H x 3.9" W x 4" D, the SA502 fits in spaces where conventional amplifiers cannot, enabling invisible installations.
Typical Applications
- Stereo background music zones in restaurants, bars, and hotel rooms
- Retail store amplification for SoundTube 8-ohm ceiling or pendant speakers
- Executive conference room and boardroom audio
- Residential multi-room audio where the amplifier must be concealed in cabinetry
- Digital signage and kiosk audio requiring compact, reliable stereo amplification
- Museum exhibit audio with motion-triggered zone control via 12V trigger
Technical Specifications
| Specification | Value |
|---|---|
| Output Power | 2 x 50W (stereo) / 100W bridged mono |
| Voltage Gain | 34 dB |
| Frequency Response (±3 dB) | 20 Hz – 20 kHz |
| Input Impedance (Line Level) | 47K Ω |
| Input Impedance (Balanced) | 600 Ω |
| Output Type | Euroblock |
| Power Requirements | 32V DC, 3.75A |
| Height | 1.2 in / 30.48 mm |
| Width | 3.9 in / 99.06 mm |
| Depth | 4 in / 101.6 mm |
| Shipping Weight | 3.1 lbs / 1.41 kg |
| Color | Black |
| Certifications | CE, RoHS, UL60065, ETL-C/US, FCC |
| UPC | 644216202904 |
Frequently Asked Questions
Q: What is the difference between the SA502 and the MA501T?
A: The SA502 is a 2-channel 8-ohm Class D amplifier designed for low-impedance speaker loads in stereo or bridged-mono configuration. The MA501T is a single-channel mono amplifier designed specifically for 25V/70V/100V distributed speaker systems.
Q: Can the SA502 drive 4-ohm speakers?
A: The SA502 is rated for 8-ohm loads in stereo mode and 8-ohm loads in bridged mono. Check load impedance before pairing with 4-ohm speakers to avoid exceeding amplifier ratings.
Q: How does the 120 Hz high-pass switch work?
A: When engaged, the switch rolls off frequencies below 120 Hz from the speaker output, protecting satellite drivers in systems where a separate subwoofer handles bass reproduction.
Q: Does the SA502 have rack-mount options?
A: Yes. The optional AC-SA502-RMA rack mount adapter allows installation in a standard equipment rack.
Q: What control systems support the 12–32V trigger input?
A: The trigger input is compatible with virtually all major AV control platforms including Crestron, AMX, Savant, Control4, and relay-based zone controllers.
Q: Where can I purchase the SA502 with project support?
A: Contact Creation Networks at creationnetworks.net for project quotes, system design, and authorized SoundTube dealer pricing.
At Creartion Networks, we do everything we can to create an excellent customer experience. This includes fast shipping and easy returns.
- Most in-stock orders placed Monday-Friday ship within 24-48 hours. General restrictions apply; please see our full shipping policy here.
- We offer a 30-day return policy from the delivery date on many products. Product restrictions apply. Restocking fees for the return of open-box items. Please see our full return policy here for more information.
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