Speaker Will Not Turn On When Using Battery; Poor Sound Quality From An Aux Device - Bose SoundLink Revolve Troubleshooting Manual

Try connecting the device with a different Aux cable
Try connecting another source to determine if the issue is specific to a particular device
Reset the speaker by turning it on and holding the Power button for ten seconds. Note: A reset
clears paired mobile devices and language settings from the speaker and returns it to original
factory settings.

Speaker will not turn on when using battery

Applies to:

SoundLink® Color Bluetooth® speaker II

SoundLink Revolve Bluetooth® speaker

SoundLink Revolve+ Bluetooth® speaker

SoundLink Micro Bluetooth® speaker
Connect the speaker with its charging cable to a USB charger or a powered computer USB port.
You may need to do this for the following reasons:
The battery may not be sufficiently charged. The battery must have sufficient charge to power up
the speaker
The speaker has been disconnected from power and unused for 14 days. When this happens, it
goes into battery protection mode. Brand new speakers are typically in this mode when they're
first removed from the box
The speaker is unplugged and unused for more than three days with a remaining charge of less
than 10%. When this happens, it also goes into battery protection mode
If your speaker still does not turn on after connecting it to power, see
when connected to AC power

Poor sound quality from an aux device

Applies to:

SoundLink® Colour Bluetooth® speaker

SoundLink® Color Bluetooth® speaker II

SoundLink Revolve Bluetooth® speaker

SoundLink Revolve+ Bluetooth® speaker
Try the following to resolve your issue:
Speaker will not turn on