The 661 from Aphex is a single channel compressor incorporating vacuum tube technology that's equally at home in music production, sound reinforcement, broadcast and post production, project studios and for the musician.
The unit consolidates three processes in a single rack-space chassis that include Tubessence technology, Easyrider automatic dynamic control and a High Frequency Expander. The 661 also provides complete manual control over the dynamics process.
A link feature allows to 661s to be combined and have VCA control of the two units function in several ways for stereo operation. Sidechain access provides for inserting an external processing device into the signal path.
| Function | Compressor/limiter and high frequency expander |
| Number of Channels | Single |
| Inputs |
1 x XLR 1 x 1/4" TRS phone 1 x 1/4" TS phone Return 1 x 1/4" TS phone Link |
| Outputs |
1 x XLR 1 x 1/4" TRS phone 1 x 1/4" TS phone Send |
| Maximum Input Level | +25dBu, +4dBu nominal level |
| Compression Threshold | -30dB to +20dB, variable |
| Compression Ratio |
Auto: 1.1:1 to 6:1, Easyrider no-knee compression curve Manual: 1:1 to 30:1 |
| Attack Time |
Auto: Program dependent Manual: 0.05 to 100 mSec |
| Release Time |
Auto: Program dependent Manual: 0.04 to 4 S |
| Gate Threshold | Not applicable |
| Gate Rate | Not applicable |
| Maximum Output Level | +22dBu, balanced |
| Make-up Gain | -12dB to +10dB |
| Frequency Response | 2Hz to 110kHz, +/-0.5dB |
| Dynamic Range | 94dB |
| Noise | Hum and noise: -83dBu, no gain reduction |
| Dimensions (WxDxH) | 19" x 10 1/8" x 1 3/4" |
| Weight | 5.5 lbs |
| Specialties | A LINK input provides two methods of linking the VCA control of two 661's - Stereo Link or Master/Slave |