
With audio tracks playing from a USB drive, the track's title and artist name are displayed on the single-line LCD display. As with iPod tracks, the unit will resume from where it left off if you change sources and then change back again to USB. Tracks can be skipped through by using the forward seek buttons, but the browsing function that we like so much when playing iPod tracks is not available for files playing from the USB drive.
In addition to its compatibility with external sources, the CDX-GT610UI acts as a capable standalone CD receiver, having the ability to play store-bought CDs as well as MP3, WMA, AAC, and ATRAC discs (no DVD-Audio discs, though) via its single disc slot. With MP3 and WMA discs playing, tag information can be accessed by pressing the DSPL button, which gives users the chance to switch between the folder, track, album, and artist names; track number and elapsed playing time; and a clock. As with the iPod function, CD audio tracks resume from where they left off when users navigate away from them and then back.
The CDX-GT610UI switches between sources with impressive speed: The switch from AUX to iPod is almost instantaneous; from AM/ FM to disc takes a couple of seconds, from disc to USB is about three seconds; from USB to auxiliary is about one second.
EQ controls
Having established the usability of its broad range of audio sources, the next question is how does the CDX-GT610UI sound? To help users tweak audio output to their own preferences, the system features a range of preconfigured EQ settings, which can be accessed and adjusted by the EQ3 button at the top right of the main volume dial. Preset EQ categories range from Space, which is tinny and airy sounding, to Gravity, which accentuates low bass notes. A very intuitive three-bar graphic on the right of the LCD display gives a visual representation of the current EQ curve configuration, and users can tweak the low, medium, and high output levels by pushing in the main volume knob.

The Sony CDX-GT610UI has an output of 23.2 watts x 4 channels (52W x 4 maximum output) and a selectable sub-out for those who want to add a separate subwoofer to their in-car audio setup. It is also prewired for satellite radio.
In sum
The Sony CDX-GT610Ui is a multisource in-car stereo at a great value. Its range of external audio source support makes it attractive to digital audiophiles, while its user-friendly interface makes it simple enough to program on the fly.
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