Sound quality: Harman Kardon's Onyx Studio 4 had good overall sound quality. Bass has good impact and goes deep but is a somewhat prominent and boomy. Midrange is somewhat even but a bit muffled and grainy. Treble is extended but is somewhat smeared. Does a so-so job of recovering room ambience; overall sound is somewhat congested. No significant difference between Bluetooth and wired sound quality. Provides a decent volume level in a large sized room. When two units are used as a stereo pair sound remains a bit muffled and somewhat congested, it can get louder but since two separate speakers are used the sound stage can be made wider depending on placement and room ambience and sound quality remains good.
Ease of use: We found the Harman Kardon Onyx Studio 4 ease of use to be very good overall. Volume controls are low contrast, there is nothing to indicate that it is a volume control except + and - symbols. Bluetooth pairing requires a press of a high contrast/backlit button and then the selection of the unit from Bluetooth selection list on source device; the unit provides an obvious indication that the unit is in pairing mode as well as when pairing has actually occurred. Switching inputs: Bluetooth has priority, line-in audio plays, but is automatically overridden by connected wireless audio playback, when wireless audio is stopped (does not needed to be disconnected) line-in audio resumes. Aux input label is low contrast
