For more than 25 years, Aphex has been a pioneer in the field of psychoacoustics and audio processing. The company recently introduced its latest Aural Exciter, the Model 204 ($399), which replaces the previous Model 104. New features include XLR inputs and outputs, a beefed-up Big Bottom section, a more high-tech look, and, according to Aphex, better performance overall.
Like its predecessor, the 204 works its magic by manipulating the frequency content of the audio it processes (especially the harmonics) to make your ear perceive additional clarity, presence, and — when using Big Bottom — bass response.
THUMBNAIL LOOK
The single-rackspace silver-faced 204 is solidly built. Each of its two channels (which can be independently switched between +4 and -10 dBu operation) has separate control sections for the Aural Exciter and Optical Big Bottom processes. The Aural Exciter adds sheen to the top end; Big Bottom adds punch and depth to the low end.
I noticed immediately that there are no calibrations on the 204's controls. I soon realized that this was consistent with how the unit is designed to be used: intuitively, using your ears and your taste as a guide. You apply the processing according to the input and how it sounds; you don't just reflexively dial up a Spinal Tap 11. As a matter of fact, turning the controls up too high can result in the sound becoming muddy or edgy.
ON THE GIG
I tested the 204 at several shows, and my bandmates and I were impressed. Most of the time I used one channel for the monitors and one for the mains (on a mono P.A.). The 204 created a louder, more present, and deeper sound field on- or off-axis of the speakers, without increasing power or requiring that the listeners to be directly in front of the cabinets. Overall, I noticed a substantial improvement articulation and warmth. The vocals and the sax sounded better, and the drummer commented that he could understand the words for a change.
After testing out the 204 on several shows, I purposely didn't bring it to one gig to see if anyone would notice the difference. Sure enough, the band bitched all night that something was wrong with the P.A.!
I also tried out the 204 out on my bass rig, through both analog and digital preamps. The unit added depth and presence to the signal and brought out the overtones from my roundwound strings.
My only suggestion for improving the 204 would be for Aphex to add a clipping indicator on each channel. I would have found that feature helpful, especially when using it in series with other processors.
Overall, the Aphex 204 is a solid unit, offering true sonic improvement at a reasonable price.
