SPL Transient Designer 2 Dynamic Envelope Processor

Was £439.00

Special Price £350.00

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From the inventors of the Transient Designer - change your sustain and attack on recorded material


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The Transient Designer provides a revolutionary concept for dynamic processing rendering controls such as Threshold, Ratio and Gain superfluous. The Transient Designer provides a very elaborated automation, so while the processing going on inside the box may be very complex, the user has to deal with just a pair of intuitive controls.

SPL's Differential Envelope Technology is the first analog solution for level-independent shaping of envelopes allowing transients to be accelerated or slowed down and sustain prolonged or shortened. The degree of dynamic processing required to do this couldn't be duplicated even using a chain of several conventional compressors, yet only two controls per channel are required to allow the user to completely reshape the attack and sustain characteristics of a sound. Attack can be amplified or attenuated by up to 15dB while Sustain can be amplified or attenuated by up to 24dB, enabling weak drum sounds to be made much more percussive and powerful, or for over-percussive transients to be softened. All necessary time constants (Attack, Decay and Release) are automated and optimised adaptively in a musical manner according to the characteristics of the input signal. This results in natural sounding signal processing and fast operation.

The Transient Designer uses envelope followers to track the curve of the natural signal so that optimum results are guaranteed regardless of the input signal's dynamics. Because of the level-independent processing inherent in Differential Envelope Technology (DET), manual threshold adjustments are not required.

For stereo operation the Link function connects a channel pair. Linked channels are controlled by the same side-chain voltage so as to maintain a coherent and stable stereo image. When operating in Link-mode, the control elements of the first channel, including the Active switch, control the second channel, too.

Each channel is equipped with a relay hard bypass circuit to ensure a minimum signal path when the process is bypassed and to provide power fail safety. The Signal-LEDs allow to quickly monitor the signal flow, which is particularly important if the four channels are connected to a patchbay. The Transient Designer 2 is fitted with unbalanced TS sockets.

  • The attack of a bass drum or a loop can be emphasised with a single control to increase the punch and the penetration in the mix
  • Sustain of a snare or room-sound can be shortened very musically to clean up the mix for more transparency
  • Acoustic or electronic instruments become "in the face" sounds or can be smoothened with lower attacks
  • De-verb capability! Less Sustain shortens reverb flags of any sound (more elegant than gates do)
  • New panorama effects based on different dynamic effects per channel – try this with loops for example

Additional Info

Additional Info


Inputs & Outputs

  • Unbalanced TS (Jack) sockets
  • Input impedance = 100 kOhms
  • Output impedance < 600 Ohms
  • Max. input level +24 dBu
  • Max. output level +22,4 dBu
  • Minimum load ohms 600 Ohms
  • Relay Hard Bypass, Power Fail Safety


  • Frequency response 20 Hz - 100 kHz (-3 dB)
  • THD & N 0,004 % @ 1kHz
  • S/N CCIR 468-3 -89 dBu
  • S/N A-weightened -105 dBu

Power Supply

  • Torroidal transformer 15 VA
  • Fuse 200 mA
  • Ground-Lift switch, Voltage selector


  • Housing Standard EIA 19 "/1U, 482x44x220mm
  • Weight 2,25 kg

Note: 0 dBu = 0.775 V. Subject to change without notice.

Manufacturer's Part Number 9946
Manufacturer Sound Performance Labs
also known as SPL Transient Designer 2, SPL Transient Designer 2 2-Channel Dynamics Processor
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