The Fairchild 660 limiter is arguably one of the most famous and sought-after compressors ever made. The magical way it adds density and dimension to a track or a mix has been demonstrated on many of the best-sounding records made in the last 50 years.

The AM660 is a faithful recreation of the classic sound and compression profile of the 660, using the AnaMod process to model the complex tube circuitry of the 660 and implement it entirely in the analog domain. Unlike a digital plug-in or processor based outboard gear, there is no latency, and no A/D or D/A conversions to compromise the sound.

Classic Variable-Mu compression profile and vintage tone

Six 660 time constants plus two vocal-friendly variations

All analog - no latency or conversion

Single-space 500 series rack format

Input Impedance:
20 KOhms, balanced

Output Impedance:
less than 50 Ohms

Max. Output Level:
+27dBu, balanced

Input Gain:
-20 to +20 dB

Frequency Response:
+/- 1 dB from 40Hz to 15kHz

Noise Level:
better than 73dB below +4dBu, 0-30kHz

Limiting Noises:
same level as a vintage 660 with GE five star 6386 tubes and properly balanced

Total Harmonic Distortion:
level- and compression-dependent

Compression Ratio:
Variable from 1: 1 to 20:1, level-dependent

Time Constants:
1-6 are the classic 660 time constants, 2a and 2b are variations on #2

Position / Attack Time / Release Time:
1 / 0.2ms / 0.3s
2 / 0.2ms / 0.8s
2a / 0.2ms / 1s
2b / 0.2ms / 2s
3 / 0.4ms / 2s
4 / 0.8ms / 5s
5 / 0.4ms / Auto, as in 660 #5
6 / 0.2ms / Auto, as in 660 #6