ARRAROWN ZK-502C Bluetooth Amplifier Board – 50W x 2, DC 9-24V, AUX for Home Speakers

Meet the ARRAROWN ZK-502C, a compact stereo amplifier board designed to upgrade existing speakers with modern Bluetooth and precise tone. Delivering 50W per channel into 4Ω or 8Ω loads, this module fits inside many DIY enclosures, offering a clean, low-noise path from source to speaker and a noticeably richer listening experience.

Powered by a capable TPA3116D2 audio chip and supported by a shielded power path, the ZK-502C minimizes interference and preserves clarity across highs and lows. A dedicated treble and bass control lets you tailor the sound to your room and preferences, while Bluetooth 5.0 wireless input keeps your setup flexible and easy to use. This isn’t just a board—it’s a DIY boost for your home audio that can elevate movie nights, music sessions, and casual listening alike.

Key capabilities

• 50W+50W rated power for robust stereo performance into 4Ω or 8Ω loads
• Bluetooth 5.0 wireless input with a clear connection to compatible devices
• 2.0 channel stereo output designed for passive speakers (30–200W, 4Ω/8Ω)
• Treble and Bass control for tonal shaping and personalized sound
• Compact form factor (102 x 50 x 18 mm) ideal for tight enclosures
• Low-noise front end, AM interference suppression, and shielded inductors for cleaner signal

Connectivity and compatibility

• Bluetooth 5.0 input and a 3.5 mm AUX input for versatile sourcing
• Bluetooth name shown as Wuzhi audio; range up to 15 m under ideal conditions
• Designed for use with phones, tablets, MP3 players, and TVs; not intended to pair with Bluetooth speakers

Power, size, and protection

• Small, sturdy module with a power path capable of supporting a wide DC input range (adapter voltage 5–27V, commonly used 9–24V)
• Built-in protections: over-voltage, under-voltage, over-heat, and short-circuit safeguards with a protective case
• Simple integration into DIY projects or existing speaker cabinets for a cleaner, more modern sound

Use the ZK-502C to refresh a living room stereo, upgrade a set of bookshelf speakers in a study, or power a compact home theater setup. The experience leans toward clarity and balance, with the potential for deeper bass and crisper highs depending on your speaker pairing and room acoustics. While results can vary by environment and source, this board offers a flexible, approachable path to richer, more controllable sound from your current audio gear.

Setup at a glance

Connect a suitable DC power supply within the specified range, attach your passive speakers, pair a Bluetooth device or connect via AUX, and use the onboard tone controls to fine-tune the sound to your taste. The result is a compact, capable upgrade that respects your existing gear while expanding its possibilities.