Sound quality: JBL's Control X Wireless had good overall sound quality. Bass has good impact but is somewhat prominent and boomy and goes fairly deep. Midrange is fairly even but a bit dark, grainy and soft and a bit echoey. Treble is subdued. Does a decent job of recovering room ambience and is a bit congested. Provides a decent volume level in a large sized room. No significant difference between Bluetooth and wired sound quality. Since two units are used as a stereo pair the sound stage can be made wider depending on placement and room ambience is decent.
Ease of use: We found the JBL Control X Wireless ease of use to be very good overall. Bluetooth pairing requires a press of a low contrast button and then the selection of unit from Bluetooth selection list on source device; unit provides an obvious indication that the unit is in pairing mode as well as when pairing has actually occurred. Although volume controls are in a prominent location they are not obvious because of their very low contrast, there is nothing to indicate that it is a volume control except (+/-) symbols, no index markings but it does indicate with a sound when you reach the max setting. Works with line in and Bluetooth inputs. Switching sources: Bluetooth takes priority over line input but when you disconnect Bluetooth (don't have to unpair) then line-in is available for immediate playback. nothing ambiguous.
