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To use two Bluetooth speakers at once with Windows, you’ll need speakers that can pair with one another. This usually means two of the same model speakers, but you may be able to pair different models of the same brand. If you haven’t yet paired both speakers, enable Bluetooth on your computer and pair them now. Here’s how:  Click the Windows search icon (a circle or magnifying glass next to the Start button). Type bluetooth into the search bar. Click Bluetooth and other devices. Slide the ″Bluetooth″ switch to On {"smallUrl":"https:\/\/www.wikihow.com\/images\/0\/0a\/Windows10switchon.png","bigUrl":"\/images\/thumb\/0\/0a\/Windows10switchon.png\/57px-Windows10switchon.png","smallWidth":460,"smallHeight":218,"bigWidth":"57","bigHeight":"27","licensing":"<div class=\"mw-parser-output\"><p>License: <a rel=\"nofollow\" class=\"external text\" href=\"http:\/\/en.wikipedia.org\/wiki\/Public_domain\">Public Domain<\/a><br>\n<\/p><\/div>"} if it’s off. Press the pairing button on the first speaker and wait a few moments for it to enter pairing mode. Click + Add Bluetooth or other device. Click Bluetooth. Click the speaker. Follow the on-screen instructions to complete the pairing. Once the first speaker is paired, pair the second speaker the same way. Some speaker manufacturers provide a Windows app you can use to connect the speakers to one another. If your speaker(s) came with an app, open it up and see if you can find an option for multiple speakers (sometimes called ″multiple outlets″). Here’s how:  Click the Windows search icon (a circle or magnifying glass next to the Start button). Type audio into the search bar. Click Manage audio devices. It’s near the bottom of the Window. If you aren’t able to click the ″Set Default″ button, the speakers are already set as your default audio output. Just skip to the next step. It’s the second tab at the top of the window. If you don’t see this option, right-click a blank area of the window, then select Show Disabled Devices. You should see it now. This tells your computer to use stereo sound instead of mono. A green and white check mark will now appear over ″Stereo Mix.″ It’s to the right of the ″Set Default″ button you clicked a moment ago. It’s the second tab.  This is the speaker that is not currently your default.  The audio settings are now closed. Once your computer comes back up, you should be able to listen to audio in stereo through both paired Bluetooth speakers simultaneously.

Summary:
Turn on both Bluetooth speakers. Pair both speakers with your Windows computer. Use the speaker manufacturer’s app (if applicable) to pair the speakers together. Open your Windows audio settings. Select Speakers and click Set Default. Click the Recording tab. Right-click Stereo Mix. Click Enable. Select Stereo Mix and click Set Default. Select Stereo Mix again and click Properties. Click the Listen tab. Check the ″Listen to this device″ box. Select your second speaker from the ″Playback through this device″ menu. Click OK. Click OK again. Restart your computer.