Although many use portable speakers via Bluetooth nowadays, most speakers still have USB ports for reasons other than playing music from your phone.

I’ve reviewed more than a thousand different consumer electronics products including headphones, speakers, TVs, and every major game system and VR headset of the last decade. I’m an ISF ...

If your speaker supports USB playback, you'll need a USB drive formatted to a compatible file system, such as FAT32 or NTFS. Then, you can save your music files to the USB drive, but they must b ...