Forget add-on modules and external hands-free calling speakerphones. The easiest and cleanest way to make calls in the car is routing them through a built-in Bluetooth phone system. If you're among the majority of drivers who doesn't have a factory-installed calling system, Sony's MEX-BT5100 is a useful all-in-one stereo and Bluetooth calling system for the aftermarket. Retaining most of the features of its predecessor--the Sony MEX-BT5000--the 5100 combines an intuitive user interface, a straightforward menu structure, and a stylish faceplate design.
The MEX-BT5100 features an elegantly simple design with a usable multidirectional joystick controller, a minimal number of buttons, and some snazzy brushed aluminum trim. The X-shaped motif on the left-hand side of the system shows that it is part of Sony's X-Plod line of car stereos. This joystick controller provides the primary interface for navigating phone menus, skipping and searching for music, and adjusting sound and volume. In contrast to a number of other similarly designed interfaces, the controller on the MEX-5100 is firm enough to resist tipping over when trying to make a selection, and has a solid feel to it. We also like the accessibility of the other controls including the prominent Source buttons situated closest to the driver, and the backlit phone and menu buttons that call up the system's intuitive menus. We like the way that the Menu button calls up different options depending on whether the system is in phone or music mode. All information is shown on the stereo's monochrome LCD display, which features a number of movie and wallpaper screen patterns and which we found a little too busy for our liking. A soft-open mechanical fold-down faceplate completes the picture.
Features and Performance
The MEX-BT5100 doubles as a music player and a hands-free calling device. To make calls, users have to pair their Bluetooth phone with the stereo, which is a very straightforward process requiring them to search for a phone using the head unit itself. Once the phone is found and connected, drivers can then import up to 50 contacts from the phone into the stereo's phonebook memory. It may just be that we have too many friends, but we found this limit to be unduly restrictive as it meant that we could not simply dump our entire contact list onto the stereo. With contacts copied to the MEX-BT5100, the easiest way of calling out is by using the Phonebook option. Navigating the call menu structure is pleasantly straightforward, and we are impressed with the speed at which the menu options appear and disappear once selected. We were less thrilled by the process of browsing through contacts once we got to the phonebook, which entailed a somewhat laborious process of notching through the contact names one at a time without the option for scrolling through by holding down the joystick.
Other dialing options include selecting from call history (which is also copied over from the phone and can be called up on the screen), by assigning and then selecting a speed dial number via one of the six preset buttons, or by manually entering a number one digit at a time using the joystick, which is probably the most time-consuming method. With a call under way, sound quality is clear and even: an option in the call menu lets drivers choose the speakers through which the incoming call audio is played. From the other end of the line, sound quality via the MEX-BT5100's mic is also reasonably clear, albeit a little tinny.