SoundTube SA502 50W Class D Amplifier

The SA502 delivers 2 × 50 W output into 8 Ω or 4 Ω loads with a maximum gain of 34 dB. It offers three operating modes—stereo, mono, and bridged mono—and three selectable inputs: balanced stereo (Euroblock), unbalanced mini-jack, and high-level Euroblock. An external 12–32 V trigger and signal-detecting auto-standby reduce power consumption in idle conditions.

Dual concentric gain controls allow independent channel adjustment, and a 120 Hz high-pass switch protects speakers from excessive low frequencies. Encased in a rugged aluminum housing, the SA502 is compact enough for discreet mounting yet robust for continuous commercial use.

Key Features

• Power Output: 50 W per channel @ 8 Ω or 4 Ω
• Gain: 34 dB maximum
• Operating Modes: Stereo, Mono, Bridged Mono
• Inputs: Balanced Euroblock, Stereo Mini-Jack, High-Level Euroblock
• Trigger: 12–32 V external, signal-detect auto-standby
• Controls: Dual concentric gain knobs
• Filter: 120 Hz high-pass switch
• Enclosure: Rugged aluminum housing
• Certifications: CE, RoHS, UL 60065, ETL-C/US, FCC
• Variation: Color: Black (UPC 644216202904)

Technical Specifications

• Frequency Response (± 3 dB): 20 Hz – 20 kHz
• Voltage Gain: 34 dB
• Input Impedance: 47 kΩ (line), 600 Ω (balanced)
• Output Connector: 3-pin Euroblock
• Power Requirements: 32 V DC, 3.75 A
• Included Accessories: 3-pin Euroblock, 4-pin Euroblock, mounting hardware, power supply, stereo RCA adapter
• Optional Accessories: Rack mount adapter (AC-SA502-RMA), 32 V DC power supply (AC-PS3240), regional power cords (AC-PSCORD-* )

What’s Included

• SA502 amplifier (black finish)
• 3-pin Euroblock connector
• 4-pin Euroblock connector
• Mounting hardware
• Power supply
• Stereo RCA adapter