Pro Co CB1 Passive Direct Box

Pro Co's CB-1 passive direct box is for connecting unbalanced musical instruments and line-level sources to low-Z balanced microphone inputs for PA or recording. Not recommended for speaker-level use. 1/4" (6.35mm) input (with parallel 1/4" output). Switch for ground lift. Male XLR-type balanced mic-level output. Uses Pro Co CBT-1 transformer (20k/150 ohm).

Pro Co CB1 Features:

• High input impedance minimizes loading for maximum sound
• 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
• Rugged "Uni-box" construction for super-strength and shielding
• Recessed switches and connectors resist damage
• Passive design requires no batteries or phantom power

Pro Co CB1 Specifications:

• Frequency Response: 20 Hz-20 kHz, +/-1.0 dB @ -15 dBv output
• Total Harmonic Distortion
  • less than .1% 20 Hz-20 kHz @ -30 dBv output
  • less than .5% 30 Hz-20 kHz @ -15 dBv output
  • less than 1.0% 20 Hz-20 kHz @ -15 dBv output
• Phase Response: less than -25 degrees @ 20 kHz (ref.1.0 kHz)
• Rise Time: less than 6.0 microseconds (2.0 kHz square wave, 10%-90%)
• Input Impedance
  • greater than 185 kohm @ 1.0 kHz
  • greater than 140 kohm @ 10 kHz
• Output Impedance
  • less than 130 ohm @ 1.0 kHz
  • less than 155 ohm @ 10 kHz
• Voltage Stepdown: less than 23 dB @ 1.0 kHz
• Maximum Input Level for 1% THD
  • +20 dBv @ 20 Hz
  • +26 dBv @ 30 Hz
  • +32 dBv @ 50 Hz
• Dimensions (LxWxH): 4.875" x 4.375" x1.75" (123.8 x 111.1 x 44.4 mm)
• Weight: 1.0 lb. (0.45 kg)
• Shipping Weight: 2.0 lbs. (0.91 kg)