This post shows how to pair the Sony SRS XG300 boombox Bluetooth speaker to Alexa smart speakers. Now this pairing happens between the Sony and Echo devices directly. Thus you need not turn Bluetooth on in the mobile device you’re using to create this connection.
How to Pair Sony SRS XG300 to Alexa, Step by Step
With your XG300 OFF (status lamp is dark), run through this routine to pair it to your Alexa Echo device. We use an iPad Air tablet to set this up.
1. Find the Alexa app on your Mobile Device
We found the app on the iPad Air. Here, the app is in a custom folder. The Smart Speakers folder.

2. Run the Alexa App
Then the app displays its Home screen.

3. Tap the More Item to Continue with How to Pair Sony SRS XG300 to Alexa
Find the hamburger item in the lower right corner of the screen.
This brings up the Alexa app’s main menu.

4. Tap the Settings Option on the Main Menu
Then this brings up the Settings screen.

5. Tap the Device Settings Option
Touching Device Settings brings up the All Devices page.

From here, choose which Echo device you wish to link with your Sony SRS XG300 speaker.
6. Tap the Alexa Device you Wish to Pair
Then this takes you to the device-specific settings screen for the speaker you chose.
In this demo, we’re pairing from our Thomas’s 2nd Echo Dot 4 speaker to our XG300.

7. Tap the Pair a Device Item
Find the Pair a Device option.
This then brings up the Setup screen.

At this point, your Alexa device scans for nearby Bluetooth devices that are in pairing mode. Here, we selected an Echo Dot 4 earlier. So, this speaker will be the one that scans for BT devices.
Note that our Dot speaker found no devices so far. But it will in the next steps.
8. Power Up the Sony SRS XG300
Bring your XG300 close to your Alexa device to pair. Then power up that speaker by pressing the Power button.

This light should then start glowing green.

9. Place the BT Speaker into Pairing / Discovery Mode
Then put the XG300 into pairing mode by pressing and releasing the Pairing button, as illustrated in the next picture.

When pairing mode starts, the XG300 announces, “Bluetooth pairing.” Then the BT status lamp starts flashing blue in a pulse-pulse-pause, pulse-pulse-pause pattern.

10. Find the Sony SRS XG300 on the Alexa App SETUP Page
With the XG300 now in discovery mode, it should appear on the Pair Bluetooth Device… page in the app.

Note that if your boombox does not show up on this page now, then try the following.
-
- Move it very close to the Alexa.
- Close and restart the Alexa app.
- Then repeat steps 3 through 7 along with step 9 above.
So we usually find that this gets the XG300 to appear here as it should.
11. Find your Sony SRS XG300 on the Discovered Devices List
See the last screenshot above. Our test speaker is there.
12. Finally, Pair your Alexa with your XG300
Then pair to the speaker by tapping its corresponding entry on the Pair Bluetooth Device… screen.
Your Alexa speaker then pairs with the boombox.
The app then takes you back to the Thomas’s 2nd Echo Dot 4 screen, which looks something like the following.

Note that our boombox now shows as paired. Also, the Sony speaker makes the Speaker Paired sound (the ding-dong sequence), and it announces, “Bluetooth paired.”
This speaker now has a pairing with your Alexa smart speaker. Its Pairing light glows solid blue to signal that successful pairing is in effect.
13. Done with How to Pair Sony SRS XG300 to Alexa !
Finally we can now ask Alexa to play music or news. Then those programs will come out of the Sony SRS XG300. Be sure though, to speak to the Alexa speaker when making requests, and not the Sony. Thus the XG300 has a pairing with Alexa. But it’s the Alexa device that still hears your voice commands through its far field microphones.