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The Inward Connections TSL-5 is the latest incarnation of the classic Inward Connections Vac Rac limiter design. This limited edition unit adds new features to the previous TSL models without altering the core sonic signature engineers have come to revere – Smooth, optical limiting presented with the euphonic character and warmth of tubes.

The TSL-5 adds a 6-position ratio control and 3-position detector high pass filter to give the classic TSL optical tube limiter circuit even more dynamic shaping abilities than ever before. The TSL has always been known for transparent compression/limiting that never gets over the top. With the new ratio control the TSL-5 serves up a whole new menu of compression characteristics. Which means this is no one trick pony.

The TSL-5 is limited to just 20 units worldwide and is the farewell to the VacRac series.


  • 40-Detent Gain Makeup Control – variable control of 14 dB of output gain
  • 40-Detent Gain Reduction Control – variable control of up to 40 dB of gain reduction
  • 6-position Ratio switch with 2:1, 4:1, 6:1, 8:1, 10:1 and 12:1 ratios
  • Bypass Switch – engages or disengages the gain reduction element
  • VU Output Switch – Assigns meters to Gain Reduction or Output
  • 3-position Detector Hi-Pass Filter Switch – engages 70 Hz, 150 Hz or 250 Hz high pass filter within the gain reduction circuit
  • Link Switch – Links opto cells of both channels for stereo operation
  • Large 3" x 3" Illuminated VU meter
  • Zero trim to calibrate the meter in Limit mode
  • Tubes used in both input channels: Input stage - 6072A, Output stage - 12BH7A
  • Power Supply: Pure Class A high voltage tube design with AC Voltage selector
  • Unit dimensions: 3 rack space. 5.25" Height, 19" Width, 11.5" Depth
  • Rugged, well-ventilated, 3U steel chassis design
  • Classic vintage look
  • Transformer Balanced, Line Level, XLR inputs and outputs


  • Gain Reduction: up to 40 db
  • Input Impedance: >100k ohms
  • Frequency Response: ±0.5 dB @ 20 Hz to 20 kHz
  • Output Signal to Noise Ratio: -85dB
  • THD + Noise: .015% @ 20 Hz (0 dB ref); .085% @ 20 kHz (0 dB ref); .15% @ 20 Hz to 20 kHz (+30 dB ref)
  • Maximum Input Level: +20 dB
  • Maximum Output Level: +20 dBm @ 600 ohms; +34 dBv @ 10 kohms
  • Output Impedance: 600 ohms transformer balanced output