Totally useless! They have a lot of hum (both grounded and ungrounded) and additional noise created by board resonance.
FiiO BTA30: Advanced Wireless Bluetooth 5.0 Long Range π Transmitter Receiver for PC/TV/Speaker/Headphone with HiFi Dac/DSP and Streamlined APP Control
15 Review
Powerful Logitech Z623: 400W Home Speaker System - Black - Get Immersed!
46 Review
Denon PMA-800NE Hi-Fi Stereo Integrated Amplifier, 85W x 2 Channels, Built-In Phono Pre-Amp, Analog Mode, Advanced High Current Power, Black
20 Review
Bluetooth adapter Baseus BA01 black 1 pc.
95 Review
JBL Horizon Bluetooth Alarm Clock Radio with Multiple Alarms, Soothing Ambient LED Light, Automatic LCD Display, and Dual USB Charging (White, AM/FM Radio)
41 Review
Experience Dynamic Audio with Panasonic SC-UX100 CD & USB Wireless Bluetooth 300W Mini Hi-Fi System Shelf Stereo
19 Review
Stream Your Favorite Tunes With AUNA KR-200 SI Internet Kitchen Radio - Spotify Support, Remote Control, And More!
15 Review
KLIM CD Boombox Portable Audio Player with FM Radio, Rechargeable Battery, Bluetooth, MP3, AUX, Neodymium Speakers, and Upgraded CD Laser Lens (2021 Edition)
11 Review