Topp Pro TDI-P1 Passive Direct Box:- Passive Direct lnjection Box
- ln: 1/4" TRS Electronically Unbalanced
- Out: Electronically Balanced XLR
ModelTDI-P1 PASSIVE DI BOXInput1/4" mono Jack connector (Tip Hot, Sleeve Ground) parallel link output 1/4" Jack connector for feeding to other equipment
Attenuator0dB / 20dB / 40dBImpedanceUnbalanced 50K Ohms / Balanced 600 OhmsOutput3 pins connector, transformer balanced, will drive lines from 600 OhmsFrequency Response10Hz to 30KHz ±1dBDimensions127 x 76 x 45mmWeight0.54Kg
What Is a DI Box?Born out of necessity in studios such as Motown and United Sound Systems to accommodate the electric instruments emerging in the 1960s, direct boxes (also known as DIs, which stands for “Direct Inject”) began as a way to resolve a basic impedance mismatch between electrodynamic guitar pickups and sensitive studio electronics. Although many modern DIs are far more sophisticated than the original models, even now, the primary function of DI boxes is to take an unbalanced, high-impedance signal and convert it to a balanced, low-impedance signal. This allows you to run guitar and bass directly into microphone preamplifiers or to send signal over extended cable runs without losing volume and significant high-frequency information.
Passive DIsLike the original models, modern passive DI boxes typically use a form of transformer to convert high-impedance signal to low-impedance signal. This style of transformer features electrically separate windings in the input and output stages, which isolates ground-level voltages and eliminate ground loops. The result is that signal is both impedance matched for a standard mic pre and free from ground hum originating at the input stage. Passive DIs are ideal for instruments with strong outputs, and both their low cost and durability make them the most popular kind of direct box.
