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Tube Tech HLT 2A Stereo Shelving EQ and Tilt Filter

Tube Tech HLT 2A front view

The Tube Tech HLT 2A Stereo Shelving EQ, combines high an Low shelving EQ and high and Low cut filters with an innoative T filter 'tilt' midrange EQ. The first time this combination has been used in an analogue EQ.

The Tube-Tech HLT 2A is a stereo high and low shelving EQ with a midrange T filter control designed to tilt the whole frequency spectrum around a selected midrange frequency.

The Tube-Tech HLT 2A is an innovative and powerful shaping EQ that remains easy to use. The combination of the two shelving bands and midrange T control offers an impressive array of EQ shaping options which are very useful to tracking, mixing and mastering engineers alike.

The shelving filters are built around a high gain valve amplifier while the T-filter uses a passive filter placed after the output amplifier. Each section has its own dedicated Bypass switch as well as an overall bypass switch.

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.

HLT 2A Features:

  • 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
  • FILTERS:
  • 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 kΩ
  • Output impedance: < 60Ω
  • Conductive plastic potentiometers
  • In- and output are transformer balanced and fully floating

The Sound of the HLT 2A

The TUBE-TECH HLT 2A marks a different approach to EQ’ing. It is a very powerful overall shaping EQ, yet extremely simple to operate. Simply put, the HLT2A will yield good results for basically any material and application, ranging from the demanding mastering engineer to the sound quality hungry project studio owner. The combination of Hi and Lo shelf and Lo/Mid frequency T just creates a ton of very nice EQ shaping possibilities!

HLT 2A SPECIFICATIONS

Input impedance: >10 kΩ

Output impedance: < 60Ω

Frequency response (-3dB):5 Hz - 55 kHz

Distortion (THD+n @ 40 Hz):

0 dBU: < 0,10 %

10 dBU: < 0,10 %

Max output (1% THD+n): > +26 dBU

Max input (1% THD+n): > +25 dBU

Noise(Rg=200Ω):

22Hz-22kHz:<-85 dBU

CCIR-468-4:

CMRR (@ 10kHz): <- 60dB

Gain: 0dB

X-talk (@ 10kHz): >40 dB

FILTERS:

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

Tubes:2x ECC82, 4x ECC83

Dimensions:H: 2 units, W: 19", D: 165 mm

Weight:

4,3kg (Net)

5,5kg (Shipping)

Power requirements: 115V/230V, 50-60Hz, 30-45W

Tube-Tech HLT2A Demo