When paired with touch-screen receivers, such as the IVA-W505 or IVA-D106 models, an onscreen keypad can be accessed for dialing new numbers.
The hands-free calling technology is licensed from Parrot and comes with Parrot's Active Echo Cancellation technology, which reduces echo from your car's speakers and limits intrusive background noise.
The KCE-400BT also supports A2DP Bluetooth audio streaming, which shows ups as a source on the receiver when paired with a compatible device. Audio quality is good but carries all of the shortcomings of the protocol, including no displaying of metadata with all but a few devices, no searching of media, and only basic audio controls (play, pause, and forward and backward skip).
Upon connecting our KCE-400BT to the Alpine iDA-X305 receiver, we encountered an error that caused the unit to lock up when pairing, necessitating a power disconnect or reset to free the unit. A quick call to Alpine tech support revealed that the problem lied in the "interrupt" setting on the receiver that needed to be changed to "off" prior to connecting the KCE-400BT. Less than 10 minutes later, we were up and running.
Call quality is good but will ultimately depend on the performance and placement of your vehicle's speakers. Even so, even the most basic vehicle speakers are more than adequate for good call quality.
Callers stated that outgoing audio quality was also superb and the included directional microphone with Active Echo Cancellation did a fine job of reducing road and wind noise. Echoes were also negligible, even with the call volume cranked fairly loud.
With an MSRP of $180, the KCE-400BT is only marginally more expensive than your average standalone Bluetooth speakerphone. However, it brings with it the advantage of using your vehicle's speakers, never needing recharging or dangling wires, and being all but invisible to potential thieves.
For owners of any of Alpine's receiver's that support the Ai-NET connection necessary to connect the add-on module, we feel that the KCE-400BT extends the functionality and the useful lifetime of the receiver by adding the convenience of hands-free calling and the bonus addition of a new audio source.
Alpine also states that the KCE-400BT's firmware will be easily updatable over the same Bluetooth signal that it uses for pairing with devices, which adds a small degree of future-proofing.