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Tube Tech
HLT2A Shelving EQ with T-Filter

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Item: N13-6244

Availability: Out of stock

HLT2A Shelving EQ with T-Filter
HLT2A Shelving EQ with T-Filter HLT2A Shelving EQ with T-Filter


A totally new kind of analog equalizer that combines variable high and low shelving eq and filters with an adjustable midrange T-Filter. The midrange T-Filter "tilts" the entire spectrum around a selectable midrange frequency point. Frequencies above that point increase (or decrease) while frequencies below that point decrease (or increase). This unique topology provides a powerful and uniquely efficient way to get beautiful-sounding overall equalization. As such, the Tube-Tech HLT-2A is destined to become a "go-to" equalizer in high-end mastering houses,smaller project studios, and everything in between.

Like all Tube-Tech processors, the stereo HLT-2A possesses a warmth and character that breathes life into a track and gives it an organic body that somehow manages to occupy real physical space inside a stereo mix, However, the functionality of the HLT-2A is unique in the Tube-Tech line - and indeed in the world of analog processing. Users will find that the HLT-2A generates quick, intuitive results that can range from mild to extreme, and it sounds great on individual tracks or strapped across the drum bus or the mix bus.


  • Low and high cut filters, low and high shelving filters, and a T-filter
  • The shelving filters are designed around a high gain tube amplifier
  • The T-filter is a passive filter placed between the shelving filters and the output amplifier
  • All three sections are supplied with a in / out switch
  • The low and high cut filters are also passive with a slope of 6dB / octave
  • A bypass switches the whole filter section out of the amplifier circuit, keeping the output stage in the circuit
  • The unit is all tube based except for the power supply
  • Input and output have fully floating transformers
  • All DC voltages are stabilized, except the anode voltage for the output stage

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  • Tube based push-pull amplifier
  • Freq. resp. @ -3 dB: 5 Hz - 55 kHz
  • Low noise: < -80 dBU @ 0 dB gain
  • CMRR: > 60 dB @ 10 kHz
  • All-tube active / passive EQ
  • Low cut: 18, 25, 40, 60, 85 Hz, 6db / octave
  • Low shelving:  18, 37, 80, 180, 370, 800 Hz. Gain: + / -12dB
  • High shelving:  1, 2, 5, 10, 15, 22 kHz Gain: + / -12dB
  • T.-filter: 0,5, 1, 2kHz. Gain: +4 / -7 dB
  • High cut: 12, 15, 18, 20, 25 kHz, 6db/octave
  • Tracking between channels: + / -0,3 dB
  • Input impedance: >10 kO
  • Output impedance: < 60O
  • Conductive plastic potentiometers
  • In- and output are transformer balanced and fully floating

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