The Aphex Model 661 is a totally new type of compressor incorporating vacuum tube
technology with the latest innovations in audio compression. This single-channel
compressor/limiter is loaded with features, consolidating for the first time in one rack
space, three patented Aphex circuits: Tubessence?, Easyrider?, and High Frequency
The UNIQUE 661 CIRCUITRY
Tubessence is a true tube circuitwhich provides that “vintage” tube sound without high
the heat, bulk, short life, fragility, and sonic variability found in traditional tube designs.
Easyrider is an Automatic mode that actually works, consisting of the Wave dependent
Compressor? (WDC) circuit which takes the guesswork out of compressing individual
instruments and vocals especially in live mixes. WDC automatically adjusts attack and
release times according to the complexity of the program material. Its No-Knee?
compression curve makes the transition into compression virtually invisible.
In the Manual mode, the Model 661 provides the full complement of compressor adjustments
such as Ratio, Attack, and Release, for maximum flexibility. Express yourself and get those
“punch“, “slap“, “fat“, “pump“, and “squeeze” sounds fast and clean.
The 661 includes the patented High Frequency Expander? (HFX) which decompresses
high frequencies, with user-adjustable ratio and corner frequency. Add “life” and “air” to your
compressed signals without fear of background noise pumping.
The Spectral Phase Refractor? restores clarity and punch to your tracks. Bass frequencies
are more defined with more apparent power. Higher frequencies also seem to gain more detail
Use the Model 661 to control dynamics for mixdowns, protect your sound system’s loudspeakers
from transients and distortion or shape the sound of individual instruments and vocals. Compress
dynamic levels without fear of reducing frequency response. Whatever type of dynamics control you’re
looking for, it can be done with the Model 661 Tube Compressor / Limiter Expressor?.
Music Production – Improve the sound on individual instruments, vocals and mixes
Sound Reinforcement – A roadable tube compressor/limiter in only one rack space
Broadcast & Post Production – A great vocal processor and a powerful studio tool
Project Studios – Improve the sound of digital recorders and workstations
Musicians – The ultimate compressor for the professional guitar, bass, keyboard instrument rig
Auto or full Manual operation. In Auto mode, compression parameters constantly change for best sound
A true tube circuit (Tubessence) in the output stage for a “warm“, “live” and “full” sound
HFX allows the use of high compression ratios without the loss of high frequencies
SPR increases the apparent bass energy level, without amplitude equalization or bass boost
Use Sidechain Access sends jacks for creative processing (de-essing and ducking)
Stereo, dual mono or master/ slave operation for total flexibility