Item #: PRO DB1 LIST

ProCo DB1 Passive Direct Box

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Product Description

Dependable, Passive Direct Box Design from Pro Co!
The Pro Co Model DB1 is a simple passive direct box that offers clean, reliable performance without unnecessary gimmicks or frills. It can be used for nearly any instrument or signal source, from electric bass, keyboards and drum machines to sub-mixers and external speaker outputs.

The DB1 is a professional quality passive direct box for connection of unbalanced musical instruments, line-level sources, and guitar amplifier outputs to low-Z balanced microphone input for PA or recording.

Pro Co DB1 Features
  • Floating Transformer-Balanced XLR Output for Maximum Isolation
  • SPKR Mode Handles Amplifiers Up to 600W RMS
  • HI CUT Filter Reduces Distortion
  • GND/LIFT Switch Eliminates Hum and Buzz
  • Rugged Uni-box Construction for Super-Strength and Shielding
  • Recessed Switches and Connectors Resist Damage
  • Passive Design Requires No Batteries or Phantom Power
The DB1 preserves the punch and clarity of the sound that is often lost when mic'ing a speaker, while eliminating the leakage, distortion and coloration. The signal delivered to the P.A. or studio mixer is crisp and clean - a vital element in retaining the full depth and brilliant sound of such current high-tech equipment as FM synthesizers and digital drum machines.

The DB1 may be inserted into the signal path at virtually any stage required. For instance, a bass guitar signal can be taken direct straight off the instrument for a clean, natural tone, from a preamp or line output for a punchier or equalized sound, or from the speaker output of the amp if a dirtier edge is desired. Keyboards can each be sent with a separate DB1 , or combined by taking a feed from the keyboard's stage mixer.

Built for the road, but equally at home in the recording studio, the DB1’s rugged 16-gauge steel and aluminum Uni-box construction enclosure is finished in a durable black texture powder coat finish with black anodized aluminum side channels. The uniquely slotted side channels allow for stacking on top or strapping side-to-side of virtually any number of Pro Co Monoface devices using the Uni-box construction. Easy to read control graphics are incorporated into the Lexan top panel overlay.


Input: 1/4 inch (6.3mm) phone accept signals from instrument or other source. Input impedance-greater than 100 kohm; SPKR-approx. 8 kohm. Handles signals of up to 69V RMS (approx. 600 watts across an 8 ohm load).

Output: 1/4 inch (6.3mm) phone jack provides loopthrough (parallel) connection from input jack. Used when inserting DB1 between instrument and amplifier. NOT RECOMMENDED FOR SPEAKER LEVEL USE.

Speaker/Instrument: Speaker position inserts 20 dB pad between INPUT and DBT-1 transformer for increased level handling capability (used for speaker- or line-level sources). INST position bypasses pad. (SPKR/INST switch affect only LO-Z OUTPUT level.)

HI Cut/Flat: Switch is only functional when SPKR/INST switch is set to SPKR. HI CUT position inserts a low-pass filter (-3 dB at 4 kHz, 6 dB. Octave) to simulate frequency response of a typical loudspeaker. Used when source is guitar or bass amplifier speaker output. FLAT position bypasses filter. (HI CUT/FLAT affect only LO-Z OUTPUT response.)

LO-Z Output: Male 3-pin XLR-type connector provides balanced floating low-impedance output (pin 2 hot). Connect to mixing board microphone channel input. Recommended load impedance: 1.0 kohm.

Gnd/Lift: GND position connects INPUT and LO-Z OUTPUT grounds together. LIFT position floats LO-Z OUTPUT. Used to reduce hum and buzz by eliminating ground loops and providing proper grounding for various conditions.
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Helpful Info about the Manufacturer
Phone:  269-388-9675 Warranty:  Stagemaster Snakes: 1 Year
Other products offer varied warranties up to lifetime. Check the specific model information.

Product Specifications

Pro Co DB1 Passive Direct Box Specifications
  • Frequency Response: 20 Hz-20 kHz +/- .5 dB at -15 dBv output
    • -3 dB at approximately 85 kHz
    • Filter mode introduces 6 dB/octave attenuation above 4.0 kHz
  • Total Harmonic Distortion:
    • < .03% 20 Hz-20 kHz at -30 dBv output
    • < .1% 30 Hz-20 kHz at -15 dBv output
    • < .25% 20 Hz-20 kHz at -15 dBv output
  • Phase Response: < -18 degrees at 20 kHz (ref. 1.0 kHz).
  • Rise Time: < 4.5 microseconds (2.0 kHz square wave, 10%-90%).
  • Voltage Stepdown: < 22 dB at 1.0 kHz (INST mode)
    • SPKR mode attenuate signal by 20 dB
  • Input Impedance:
    • > 130 kohm at 1.0 kHz (INST mode)
    • > 105 kohm at 10 kHz (INST mode)
    • Nominal source impedance is 20 kohm
    • Approximately 8.2 kohm (SPKR mode)
    • Nominal source impedance is 0 ohm
  • Output Impedance:
    • < 200 ohm at 1.0 kHz
    • < 215 ohm at 10 kHz
    • Nominal load impedance is 1.0 kohm
  • Maximum Input Level at 50 Hz for 1% THD:
    • +16 dBv (INST mode)
    • +34 dBv (SPKR mode ) at 20 Hz. +21 dBv (INST mode)
    • +41 dBv (SPKR modeprobo) at 30 Hz. +26 dBv (INST mode)
    • +46 dBv (SPKR mode) at 50 Hz
  • Dimensions (DxWxH): 4.88 x 4.38 x 1.75 inches (123.8 x 111.1 x 44.4 mm)
  • Weight: 1 lb (0.46 kg)

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