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Poor sound quality when playing on multiple Bose wireless audio systems | Bose Home Speaker 300
If playing the same source on all systems compatible with the Bose app, be sure to use the Add All option in the Group menu of a speaker.
Add All lets all speakers on your account play the same sound in sync. When not using this option—by selecting the same audio stream with each speaker—each speaker would play an independent instance of that stream, which may not play in sync.
Reset the products having the issue.
For information on performing a reset, see Resetting your product. (Note: A reset is used to correct occasional product issues. It is not something that a product should require repeatedly.)
Determine if the product has a good connection to the router.
In the Bose app, go to the Technical Info screen from product's Settings menut and check its Wi-Fi Strength. The number will range from -30 dBm (best signal) to -90 dBm (poor signal). If the connection is poor, consider relocating the router and/or product or reducing sources of interference to improve signal. For more information, see Determining the Wi-Fi network name and signal strength of your product.
Check to see if other devices on your network are using too much bandwidth.
When a device is active on your network, they use some of the available bandwidth of your router. Some tasks use more bandwidth than others—like video streaming, gaming, video calls, data backups, etc. If devices are performing these tasks, bandwidth can decrease for other devices. Turn off any device or app that might be using a lot of bandwidth, then check if performance improves. If possible, use an Ethernet cable instead of Wi-Fi to connect high-bandwidth devices to your network. This frees up wireless bandwidth for devices that need to be connected wirelessly.
Check for sources of wireless interference.
It's possible that interference from other wireless devices are affecting the wireless functionality of your product. Check for other wireless devices in the area of your product (i.e. another router, cordless phone, wireless printer, smart TV, etc.). To determine if a device might be interfering, try unplugging its power cord or disabling Wi-Fi on the device. If the issue is resolved when a particular device is removed, try placing that device farther away from your product, if possible. Additionally, if the device has a wireless channel setting, try a different channel.
If using a dual-band router, try using router's other band.
On routers that offer 2.4 and 5.0 GHz networks, try connecting to the router's other band. For example, if connected to the router's 2.4 GHz network, try connecting to its 5.0 GHz network -- or vise-versa. If the issue is only present on one band, there is interference on that band. Try to reduce or keep clear of potential sources of interference (i.e. cordless phones or baby monitors on 2.4 GHz) or, if possible, use the band without interference.
Reboot your router.
Routers may need to be reset from time to time—much like rebooting a computer. Disconnect power from the router for 30 seconds, then wait for it to start up and connect. (Note: Any device connected to the Internet will be interrupted during the reset.)
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