|
 Virtual
Reality Sound Labs has introduced a series of mobile MP3 players with built-in
FM modulators. This review includes the VRFM9, which allows music to be played
using three different options. MP3 or WMA audio files can be stored on either
an SD memory card or a USB flash drive plugged into the base of the unit. Alternatively,
analog audio can also be connected into the side of the VRFM9 with any standard
portable audio device such as an iPod. The audio is then transmitted on one of
fifteen user-defined frequencies using the built-in FM modulator. The two row
backlit LCD can display ID3 data (if available), including song title, artist,
album and genre.
Operation
Only three buttons occupy the front of the unit for Track+/Volume+, Track-/Volume-
and Play/Pause. Pressing and holding the Track+/Volume+ or Track-/Volume- button
will increase or decrease the volume respectively. Pressing and holding down the
Play/Pause button will change the mode from Play/Pause to Shuffle/Random mode.
The unit has a six position ratcheted elbow that allows it to be adjusted for
easy viewing and access. A pair of channel buttons on the top of the unit are
used to change the transmitting frequency, which is shown on the LCD display and
is saved upon removal of power. The unit will remember the last transmitting frequency
upon removal of power. The
display has good information, but it's not the easiest to read while driving.
Information displayed includes Track Time, FM Frequency, Filename,
Normal/Shuffle Mode and Audio Source (SD, USB or Line). A transmitting
icon with the assigned frequency is shown in the upper right corner. An SD card
icon or USB icon is displayed when the corresponding memory is being used as an
audio source. Conclusion
The VRFM9 performed well for such an inexpensive product and offers a compact
design with a good set of features. The built-in FM modulator works well as long
as the user is not fighting a competing transmitter. We found that in Los Angeles
it was difficult to find an available frequency that we could use without interruption.
This resulted in occasional static. Audio quality was on par with any good FM
station. Even though the audio comes from a digital source, modulating the audio
on an FM band does to some degree limit frequency response and dynamic range.
The package also includes a manual, extra 0.5 amp fuse and a 3-foot male-to-male
3.5mm audio cable for interfacing to portable audio players. All in all the VRFM9
delivers great performance for the dollar. -
Kevin Nakano | 
