Solid State Logic 500 Series 4KB Dynamics
Solid State Logic 500 Series 4KB Dynamics
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Solid State Logic 500 Series 4KB Dynamics

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The SL 4000 B introduced in 1976 achieved immense notoriety due to its feature in the 'Stone Room' of London's Townhouse Studios, integral to the production of iconic records, featuring on including Phil Collins’ ‘In the Air Tonight’, The Buggles’ ‘Video Killed the Radio Star’ and Peter Gabriel’s ‘Intruder’. Delivering an authentic emulation of the SL 4000 B channel strip with its colourful, punchy, and non-linear analogue character in the 500 series format.

Key Features:

• Authentic recreation of SL 4000 B consoles dynamics processing • Design based on the SSL Bus Compressor • Features Compressor/Limiter & Gate/Expander • Feedback design with Peak sensing for aggressive ‘grabby’ character • Fixed compression ratios, 2:1, 4:1 & 10:1 with additional ‘DS’ mode • Fixed release times, DS, .2, .4, .8, 1.6 & renowned ‘Auto’ • Auto make-up gain • Sidechain High Pass Filter • Stereo Link mode • New (classic) SSL flavour for your productions


  • RATIO - Stepped compression ratios 2:1, 4:1, 10:1 and ‘ds’. The ‘ds’ setting is a fixed 10:1 with an additional sidechain filter. When ‘out, the compressor is bypassed.
  • THRESH - Whenever a signal exceeds the level set by this control, the compressor will start to act at the ratio set by the Ratio control. The Threshold and Ratio controls also provide automatic make-up gain.
  • HPF - A 6dB/Oct 185 Hz High Pass Filter in the compressor sidechain to help reduce bass pumping effects.
  • RELEASE - Switched/fixed release ranges from .2 ms to 1.6 ms with additional ‘DS’ & ‘Auto’ release options.
  • DS - The De-Ess mode changes the attack time from approx. 30 ms to 2 ms.

De-Ess (DS) mode:

By setting Compressor Ratio and Release controls to ‘DS’ the B-DYN module is optimised for reducing sibilance (De-Essing). The De-Ess is a 10:1 ratio with filtered S/C input signal, delivering broadband compression triggered by sibilance. The ‘DS’ release is automatically varied in response to the processed signal between release rates of 30 & 50 ms. This is a much faster minimum release than you would normally expect from an SSL Dynamics section. The attack time is also reduced to a fast 2 ms, slightly faster than the E-Series Dynamics module on its fast setting.


  • The B-DYN Gate/Expander section can act as a 20:1 Gate or as a 2:1 Expander when the EXP button is pressed. Its attack time is a fast 0.2 ms.
  • RANGE - Controls the maximum amount of gain reduction applied by the Gate/Expander. When set to ‘out’, the gate/expander is bypassed.
  • THRESH - Sets the threshold above which the the gate/ expander will be opened.
  • RELEASE - Sets how long the signal remains audible after the Gate/Expander closes.
  • EXP - Switches the gate to expander mode with a gentle curve, for subtler control of level below the threshold.

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