The 541 Optical Compressor is a 500-series feedback style compressor, designed for smooth, unobtrusive gain reduction. The 541 utilizes a pair of Silonex optocouplers - one for gain reduction and one for subtractive metering.
The 541's control set is minimal, including a ten-segment LED gain reduction meter, a threshold control operating in the dbx-style counterclockwise direction with a very arbitrary orientation, and makeup gain.
There is also a very big yellow lighted IN switch which controls relay bypassing. An internal DIP switch selects linking of two or more units.
The XQP 541 conforms to API's 500-series specifications and has been approved by the VPR Alliance.
SpecificationsInput impedance: 43kΩ balanced
Output impedance: 50Ω balanced Frequency response: 4-85kHz (-3dB)
Maximum output level: 22 dBu
THD (No Gain Reduction): <0.002% @ 1kHz
Noise: -80dBm, unweighted Attack time: 30mSec Release time: 200mSec Compression ratio: 3:1
Current Requirement: 100mA @ +/- 16v