If you have D50s and a high definition audio system you will definitely appreciate the sound improvement. It didn't affect the A50 with Sundaras and U12T in any way to my ears, but it does make the D50 smoother at high frequencies, with a larger soundstage and more organic sound compared to an external battery. The D50's are much better now, and the most obvious difference I've noticed is on my Emotiva AMP amp with B&W 603 speakers.
Bluetooth adapter Baseus BA01 black 1 pc.
95 Review
Nobsound Dual TPA3116 Digital Power Amplifier - High-Fidelity Stereo Amp With NE5532P Pre-Amp, Audiophile-Grade 2.0 Channel And 100WΓ2 Output (Black)
13 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
Experience Hi-Fi Amplification and Alexa Compatibility π with Denon DRA-800H Network Receiver for Home Theater
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
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
Sangean PR-D4W Portable Weather Alert Radio with AM/FM Bandwidth Narrowing and Auto Tracking for Improved Searchability
12 Review
Radio receiver Max MR-322 anthracite
14 Review