The Tube-Tech HLT-2A upends the traditional EQ paradigm, combining low- and high-frequency shelving plus high- and lowpass filters with the ingenious T-filter midrange "tilt" EQ in a revolutionary stereo tube equalizer. Tube-Tech's innovative T-Filter "tilts" the entire sonic spectrum around a selectable midrange frequency. Above that point, frequencies increase (or decrease) while frequencies below that point decrease (or increase). Engineers find this a powerful and highly efficient way to quickly zero-in on gorgeous-sounding overall EQ. Perfect for individual tracks, stems, or strapped across the drum or mix bus, the Tube-Tech HLT-2A is an ideal go-to EQ for project studios, high-end mastering suites, and everything in between.
Mastering Version
A mastering version of the HLT2A with stepped pots and a smaller and more detailed range for the shelf and T- filter EQ.
Beautiful broad-stroke equalization
If you need to zap an obstreperous frequency without causing collateral damage, the HLT-2A is not the right tool. But if you have use for a broad-brushstroke EQ that imparts sonic beauty to everything you feed it, the HLT-2A will serve you well. It works wonders strapped across your stereo mix bus, but its unique features also make it indispensable during tracking. It breathes life, warmth, and personality into a signal and gives it palpable dimension within your mix.
Instant sonic gratification
The HLT-2A is a stereo EQ featuring active high and low shelving, a passive T-filter, and passive high- and lowpass filters. The shelving EQs are designed around a high-gain tube amplifier, while the T-filter and low/high-cuts are passive filters positioned before the output amplifier, after the active shelving EQ. The T-filter works intuitively, like a seesaw: with a clockwise turn of the pot, the high end goes up and the low end goes down — and visa versa. Tube-Tech has provided a bypass switch for each section, plus an overall bypass switch that eliminates all filters from the circuit but leaves the output stage in; so you can warm up a signal without EQing it, should you so desire. In operation, the HLT-2A is a joy to use, mainly due to the speed with which you can obtain sonic gratification. Put one in your rack — you will be amazed and delighted.
Features:
- All-tube active/passive stereo equalizer
- ±12dB of active low- and high-frequency shelving
- Low shelving selectable at: 18, 37, 80, 180, 370, and 800Hz
- High shelving selectable at: 1, 2, 5, 10, 15, and 22kHz
- Passive high- and lowpass filters with 6dB/octave slope
- Highpass selectable at: 18, 25, 40, 60, and 85Hz
- Lowpass selectable at: 12, 15, 18, 20, and 25kHz
- Ingenious T-filter midrange "tilt" EQ (+4/-7dB, -7/+4dB)
- T-filter selectable at: 500Hz, 1kHz, and 2kHz
- Master Bypass switches entire filter section out of the amplifier circuit but leaves the output stage in
- All tube-based, except for power supply
- Tube-based push-pull amplifier
- Fully floating transformers for input and output
- All DC voltages stabilized, except output-stage anode voltage
- Frequency response: 5Hz - 55kHz (-3dB)
- Input impedance: >10k ohms
- Output impedance: < 60 ohms
- Low noise performance: < -80dBU @ 0dB gain
- CMRR: > 60dB @ 10kHz
- Inter-channel tracking: ±.3dB