Check the listing for details. TDP-2 Passive Stereo FET Direct Box. Condition: New. Listed at 329.00 USD. Utilizing an OEP/Carnhill transformer made in the UK, mated with a simple “less is best” design approach, the Telefunken passive DI’s provide superior vibe and character to best complement the natural tone and feel of your instrument.The high quality audio transformer is just one of the premium design elements in the TD Series direct boxes. The PCBs are all 100% hand-assembled exclusively with through-hole components to provide a much more secure and reliable connection compared to common surface-mount technology. All circuit traces are gold-plated for maximum conductivity over the life of the product. High input impedance prevents the loading down of passive pickups. The frequency response of the circuit is ± 2dB from 10 Hz to 40 kHz, with extremely low distortion and self-noise.