Vintage Stereo Transformer Warmth Meets Absolute Signal Clarity
When managing stereo instruments or multiple line-level tracks in modern live sound and studio production, maintaining a balanced, phase-coherent stereo image is critical. The Telefunken TDP-2 Dual Passive Direct Box is built exactly for this purpose, providing two premium, isolated DI channels in a single compact footprint. Because it features a completely passive architecture, the TDP-2 requires no phantom power, batteries, or wall warts—delivering pure, reliable plug-and-play operation anywhere in the world.
The driving engine inside the TDP-2 consists of two world-class British-made Carnhill transformers. When hit with massive synth pads, active bass strings, or digital playback tracks, these premium transformer cores saturate gracefully, smoothing out harsh digital spikes while widening the lower-mids. Whether you are running stereo tracking lines straight to a stadium front-of-house (FOH) console or routing electronic keyboards into high-end studio preamps, the TDP-2 handles your signal with absolute precision, zero phase distortion, and ultimate road reliability.
Product Description
Dual British Carnhill Transformer Engines:
The acoustic identity of the TDP-2 is anchored entirely by its two custom-wound Carnhill transformers. Hand-selected for their superior harmonic properties and immense headroom, these transformers ensure a broad, ruler-flat frequency response from 10 Hz all the way up to 40 kHz. They provide flawless impedance matching on both channels independently, effortlessly stepping down high-impedance ($100\text{ k}\Omega$) instrument lines into low-impedance ($600\text{ }\Omega$) mic-level signals. This premium pairing ensures an exceptionally low noise floor and a deep, multi-dimensional stereo field that keeps your instruments sounding massive and perfectly balanced across the stereo spectrum.
Bulletproof Hardware Architecture and Stage Protection:
The exterior of the TDP-2 is built like a tank to withstand the punishing environment of live concert touring. The enclosure is constructed from heavy-duty extruded aluminum, eliminating flex and shielding internal components against stray electromagnetic fields. All toggle switches are deeply recessed within the chassis walls, ensuring they cannot be accidentally flipped or snapped off when packed into road cases or stepped on mid-performance.
Every single connection point on the TDP-2 utilizes top-tier hardware. The instrument inputs and parallel through-put jacks are genuine, heavy-duty 1/4" connectors, while both balanced outputs feature premium 3-pin Neutrik XLR connectors with 24K gold-plated pins. This gold-on-gold contact ensures maximum electrical conductivity and stops corrosion or oxidation from degrading your sound over decades of live and studio use.
Advanced Utility Control and Hum Isolation per Channel:
To handle the unpredictable signal levels found in professional live tracking, each channel of the TDP-2 is equipped with an independent, rugged -15 dB attenuation pad. Engaging this switch allows the DI box to comfortably accept hot line-level outputs from digital audio interfaces, commercial media players, or active preamp electronics without clipping the internal transformer cores.
Additionally, the unit features independent Ground Lift switches for Channel 1 and Channel 2. When dealing with complex stage power distribution networks that create nasty background hums and 60 Hz buzzes, activating the ground lift isolates the input and output grounds. This breaks dangerous loop circuits instantly, restoring a dead-silent noise floor to your signal path without compromising your stereo separation.
Key Features
DUAL BRITISH CARNHILL TRANSFORMERS: Driven by two premium, custom-wound Carnhill transformers (UK) for rich analog weight, warmth, and massive headroom.
STEREO OR DUAL MONO TRACKING: Perfect for stereo keyboards, backing tracks, electronic drums, or running two completely separate mono instruments.
100% PASSIVE CIRCUITRY: Pure plug-and-play design that requires no batteries, wall adapters, or +48V phantom power to operate.
RECESSED TOGGLE ARCHITECTURE: All utility switches are deeply recessed into the casing to prevent physical damage or accidental activation on stage.
GENUINE NEUTRIK XLR OUTPUTS: Dual balanced 3-pin male Neutrik XLR outs featuring 24K gold-plated pins for lossless connectivity and corrosion resistance.
INDEPENDENT -15 dB ATTENUATION PADS: High-grade switches drop incoming gain to prevent overloading when connected to hot electronic or line-level sources.
TWO GROUND LIFT SWITCHES: Safely decouple pin-1 from each circuit to break ground loops independently and eliminate system buzz, hum, and hiss.
1/4" PARALLEL THRU JACKS: Send uncolored dry signals simultaneously to on-stage amplifiers or monitors while routing the balanced outs to FOH.
Technical Specifications
Feature
Specification
DI Box Type
Dual / Stereo Passive Direct Box
Transformer Core
2 x Custom-Wound British Carnhill Transformers
Number of Channels
2 (Completely Isolated)
Frequency Response
10 Hz – 40 kHz ($\pm$1 dB)
Input Impedance
> 100 k$\Omega$ per channel (Typical Instrument Level)
