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Closed Memorial Day Weekend - Fri May 24 ~ Mon May 27

The Pro Co TradeTools CB1 is a simple passive direct box that offers clean, reliable performance with nearly any unbalanced signal source, including electric bass, acoustic guitar pickups, keyboards, drum machines and mixer outputs.

Using the CB1 is a convenient, low-cost alternative to mic’ing speakers. It reduces distortion and coloration and eliminates “bleed” and leakage from other instruments. The signal delivered to the P.A. or studio mixer is crisp, clean and full - a vital element in retaining the awesome bass and brilliant sound of digital instruments such as synthesizers and digital-sampling drum machines.

The CB1 shares the heavy-duty “Uni-box” construction with Pro Co’s premium TradeTools DB1 Direct Box. The rugged 16-gauge steel and aluminum box is finished in black with a bold blue Lexan® overlay emblazoned with high-visibility control and connector identification graphics. The uniquely slotted side channels allow for stacking on top or strapping side-to-side of virtually any number of Pro Co TradeTools devices using the Uni-box construction.


  • High Input Impedance Minimizes Source Loading for Maximum Performance
  • Floating Transformer-Balanced XLR Output for Maximum Isolation
  • GND/LIFT Switch Eliminates Hum and Buzz
  • Handles Line-Level Inputs to +20 dBv at 20 Hz
  • Flush-mounted Switches and Connectors Resist Damage
  • Passive Design Requires No Batteries or Phantom Power
  • Rugged Pro Co Uni-Box Construction Provides Protection and Shielding

All measurements made with 20 kΩ source feeding INPUT and 1.0 kΩ load on all LO-Z OUTPUT to simulate typical "real world" instrument pick-up and mic preamp. 0 dBv ref. = .775 volt.

Frequency Repsonse:
20 Hz - 20 kHz, ± 1.0% @ -15 dBv output.
-3 dB @ approximately 57 kHz.

Total Harmonic Distortion:
<.1% 20 Hz - 20 kHz @ -30 dBv output.
<.5% 30 Hz - 20 kHz @ -15 dBv output.
<1.0% 20 Hz - 20 kHz @ -15 dBv output.

Phase Response:
<-25 degrees @ 20 kHz (ref. 1.0 kHz).
Rise Time:
<6.0 microseconds (2.0 kHz square wave, 10%-90%).

Input Impedance:
>185 kΩ @ 1.0 kHz.
>140 kΩ @ 10kHz.
Nominal source impedance is <20 kΩ.
Output Impedance:
<130 Ω @ 1.0 KHZ.
<155 Ω @ 10 kHz.
Nominal load impedance is >1.0 kΩ.
Maximum Input Level for 1% THD:
+20 dBv @ 20 Hz.
+26 dBv @ 30 Hz.
+32 dBv @ 50 Hz.