Solid State Logic X-Logic Series Compressor/Limiter Controls, Expander/Gate Controls, D-3

X-Rack Dynamics Module

D.3 Performance Specification

The following pages contain audio performance specification figures for the X-Rack Dynamics Module. No other Solid State Logic products are covered by this document and the performance of other Solid State Logic products can not be inferred from the data contained herein.

D.3.1 Measurement Conditions

For each set of figures on the following pages, the specific unit and test setup will be stated at the beginning of that section. Any changes to the specified setup for any particular figure(s) will be detailed beside the figures to which that difference applies.

D.3.2 Measurement References

Unless otherwise specified the references used in this specification are as follows:

•	Reference frequency:	1kHz
•	Reference level:	0dBu, where 0dBu ≈0.775V into any load
• Source impedance of Test Set:		50Ω
• Input impedance of Test Set:		100kΩ

•All unweighted measurements are specified as 22Hz to 22kHz band limited RMS and are expressed in units of dBu

•All distortion measurements are specified with a 36dB/Octave low pass filter at 80kHz and are expressed as a percentage

•The onset of clipping (for headroom measurements) should be taken as 1% THD

•Unless otherwise quoted all figures have a tolerance of ±0.5dB or 5%

•All measurements are made with the operating level switch set for +4dBu

D.3.3 Compressor/Limiter
Controls:
Ratio (slope)	Variable from 1 to infinity (limit)
Threshold	Variable from +10dB to –30dB
Attack Time	Normally auto sensing, switchable to 1mS
Release	Variable from 0.1 to 4 seconds

The XLogic Channel unit Compressor/Limiter has two modes of signal detection, Peak and RMS. As their names suggest these modes of detection either act on peaks of the incoming signals or on their RMS levels. This gives two very different modes of compression and limiting with Peak Mode giving far more dramatic compression characteristics.

D.3.4 Expander/Gate
Controls:
Range	Variable from 0 to 40dB
Threshold	Variable from –30dB to +10dB
Attack Time	Normally auto-sensing, switchable to 150µs
Hold Time	Variable from 0 to 4 seconds
Release Time	Variable from 0.1 to 4 seconds

The side chain signal can be sourced either from the signal feeding the dynamic or the external Key input. Filters and/or Equaliser can be inserted in the sidechain.

LED meters independently indicate amount of compression and expansion.

Page D-3