The CDX-GT620IP also differentiates itself from its entry-level sibling with some impressive audio-tweaking features. In addition to its seven EQ presets and three-band graphical equalizer, the stereo features Sony's digital soundstage optimizer, which enhances audio output by creating what Sony calls a "more ambient sound field." In practice, DSO delivers a mixture of increased volume and sharpened output. Aside from a universal increase in volume, the effect of the DSO is different depending on what kind of media is being played: with compressed audio files such as those on an iPod or an MP3 disc, the DSO appears to boost high- and mid-range output, leading to greater definition in vocals, snare drums, and cymbals.
With uncompressed Red Book CDs, the DSO feature has less of an immediate effect at its lowest setting, but at DSO 2 and 3 the effect is noticeable, particularly with low-end output as bass is enhanced, giving the impression of a low-output subwoofer. In all cases, the DSO has the effect of swelling the sound higher into the car's cabin, and comparison between no DSO enhancement and the DSO 3 setting is similar to the difference between listening to audio through a closed door and then opening that door to hear it unimpeded.
Being a member of Sony's Xplod lineup of car stereos, the CDX-GT620IP advertises its "100dB+" capabilities on the front of its faceplate, and thanks to its built-in 17-watt (RMS) amplifier, the system lives up to its promise with reasonably clear output even at high volumes. Those who want even more power have options to hook their own external amps and subs up to the CDX-GT620IP via three preamp outputs, including a dedicated sub preamp output with its own crossover and level control.
In sum
With an price of about $160, the CDX-GT620IP delivers decent sound quality and iPod compatibility for a competitive price. We like its stylishly simple faceplate design and its intuitive audio-search interface, while its DSO function gives even stock speakers a boost.
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