The Sunbuck AS-35BU is a compact stereo amplifier receiver offering Bluetooth connectivity, multiple audio inputs, and karaoke functionality in an affordable package. Designed for small to medium-sized rooms, it provides 2-channel amplification with USB, SD card, and FM radio capabilities alongside traditional RCA inputs. While not a smart device natively, it integrates with Home Assistant through Bluetooth media players or smart plugs for power automation and whole-home audio systems.
Overview
Device Score Summary
Category
Score
Rationale
Features
★★★☆☆
Good feature set for the price including Bluetooth and multiple inputs, but limited audio quality and power
Interoperability
★★★☆☆
Standard Bluetooth works with HA, but lacks advanced control. Smart plug provides basic automation
Setup Ease
★★★★☆
Simple Bluetooth pairing and smart plug installation. Straightforward for basic power and audio automation
Cloud Dependency
★★★★★
Completely local operation via Bluetooth and direct power control. No internet or cloud services required
Vendor Trust
★★☆☆☆
Budget brand with limited support infrastructure. Product works but expect minimal warranty service
Overall
★★★☆☆
Solid budget option for basic smart home audio zones where high fidelity isn’t priority
★★★★★ Exceptional | ★★★★☆ Very Good | ★★★☆☆ Good Enough | ★★☆☆☆ Frustrating | ★☆☆☆☆ Avoid
Features
2-channel stereo amplification with 2x20W output power per channel
Bluetooth 5.0 wireless connectivity for smartphone and computer streaming
USB and SD card reader for direct playback of MP3 files
FM radio tuner with digital display and station memory
Multiple input options: Bluetooth, USB, SD, AUX, and microphone inputs
Karaoke functionality with dual microphone inputs and echo control
Bass and treble tone controls for sound customization
Remote control included for convenient operation
Specifications
Price
$40-60
Protocol
Bluetooth 5.0
Hub Required
No
Power
Wired (AC 110V/220V)
Cloud Dependency
Local
HA Integration
Custom (Bluetooth / Smart Plug)
Voice Control
None (indirect via HA automation)
Dimensions
8.7 x 7.9 x 3.1 inches
Warranty
Not specified
Home Assistant Integration
Integration Method: Bluetooth Media Player + Smart Plug
Requirements: Bluetooth adapter on Home Assistant host or ESPHome Bluetooth proxy device within range. Smart plug (Zigbee, Z-Wave, or WiFi) for power automation
Entities: Media player entity for Bluetooth audio streaming and playback control. Switch entity from smart plug for power on/off automation
Setup: Configuration → Integrations → Bluetooth → Pair with amplifier. Add smart plug to HA, create scripts combining power-on with TTS or media playback
Notes: Volume control through Bluetooth API is limited. Physical volume setting on amplifier recommended. Input source cannot be changed remotely without IR blaster
Practical Considerations
Power State Memory: Amplifier returns to last-used input when powered on via smart plug. Set desired input before integrating with automation
Bluetooth Range: Typical 30-foot range. ESPHome Bluetooth proxy extends coverage if Home Assistant server is distant from amplifier location
Audio Quality: Budget amplifier suitable for background audio and voice announcements. Audiophiles should consider higher-end equipment
IR Remote Control: BroadLink IR blaster can add input switching and advanced control beyond Bluetooth and power automation
Speaker Impedance: Supports 4-8 ohm speakers. Verify speaker compatibility to avoid damaging amplifier or poor audio performance
Cooling Requirements: Amplifier generates heat during operation. Ensure adequate ventilation, especially in enclosed cabinets
No Audio Feedback: Home Assistant cannot detect what’s currently playing from USB/SD sources. Bluetooth streaming provides better state tracking
