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The WOW stereo expansion doesn't work very well with headphones. By definition, headphones already give you excellent stereo separation, though the TruBass enhanced bass is welcome (probably a moot point if you use the RumbleFX Force Feedback Headphones). With better 3-piece speaker systems such as the Altec Lansing ACS45.1, TruBass helped to make some of the bass sounds less muddy and more defined. There was definitely improvement in some cases with WOW and TruBass enabled, but the improvement is not as impressive compared to that of more modest, closely spaced speakers.
The TruBass enhancement on the RumbleFX works very well in almost all situations, though the upper limit could stand to be significantly increased. The WOW stereo expansion works just as well, provided it is matched with the appropriate source materials. Unsuitable material will result in all sorts of weird effects and distortions. Mono to stereo "conversion" only works well with very select source material - otherwise, it just brings out tape hiss and background noise. Evergreen indirectly acknowledges this by placing a 3D Sound on/off switch - they don't expect you to like what the RumbleFX does to everything.
The RumbleFX functions well as a plain amplifier, though the inclusion of unamplified outputs is thoughtful decision on Evergreen's part. Portability is hampered by the use of a DC adaptor. To be fair however, using regular batteries as a power source is an impractical alternative due to the high voltage and current requirements.
Lastly, one of the most important considerations for the end-user is the price. The RumbleFX has a MSRP of US$79.99, a tad on the expensive side. Doing some digging turned up the unit at Computers4SURE for US$55.99, a much more reasonable price tag. At this price level, the RumbleFX 3D Sound Amplifier is a must have for video game console owners. Computer users with more modest sound systems would benefit greatly as well, though those with better 3-piece speakers or who use headphones won't realize as much benefit.
A safe buy so long as you know what you are getting. Highly Recommended!
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