The TK Audio TF1 is high/low-pass filter offers a HPF ranging from 30–480Hz and a LPF ranging from 100Hz–2.2kHz. Each filter can have its range values multiplied by 10x (HPF 300Hz-4.8k and LPF 1kHz-22k), and each can have selectable 6dB or 12dB slopes.
- HPF range: 30Hz-480Hz or 300Hz-4.8kHz
- LPF range: 100Hz-2.2kHz or 1kHz-22kHz
- Headroom: +27dBu