MCM Electronics

Single Channel Passive Direct BoxMCM Part #: 555-12040  |  Pyle Part #: PDC21

Single Channel Passive Direct Box 3.5 stars from 2 reviews.
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Single Channel Passive Direct Box

Used to take speaker output signal from any amplifier and insert into a balanced input on a mixer or separate amplifier. 1/4" speaker level input is connected directly to amplifier output, 1/4" pass through output can then be connected to speaker. Balanced XLR output is then provided to connect to separate mixer.

Product Description

    Features
  • Ground lift selector
  • 0/-20/-40dB attenuator
  • Rugged metal enclosure
  • Passive device, requires no power

Product Reviews

  • "Single Channel Passive Direct Box" by BBCunion on 5/16/2012
    Overall: 4 out of 5
    Value:
    Quality:

    We have two in use at a camp. One interfaces a very long 70 v speaker run (through a transformer then into the direct box) into an amplifier to be repeated. The other is used to interface between the audio output of a walkie talkie into an amplifier. They work well for these applications.

  • "Economy Direct Box" by mcmJames on 1/25/2012
    Overall: 3 out of 5
    Value:
    Quality:

    First the 20dB attenuator position is not 20dB attenuation. It is about 5 dB attenuation and moves the lower -3dB cutoff frequency up to 1.5kHz due to the divider appearing as 26k ohms source to the transformer primary that is much less than the stated 50 k ohms at low frequency. If you want this box to be useful for something, change the 47K and 56K resistors to 4.3k and 470 respectively to achieve 20 db. Then use this box only when coupling to low impedance outputs such as speaker, headphone, and keyboard outputs and not high impedance guitar outputs. On the 0dB attenuator position, the lower -3dB cutoff is 42 Hz at 600 ohms, 280 Hz at 6.8k ohms and 1.5 kHz at 26 k ohms. The Pyle spec. is useless, as it was copied from an active direct box spec. listing max input at one value for 9V. battery power and another for 48V. Phantom power. This box is not powered! I received no reply from Pyle when I emailed about this discrepancy.

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Package Specifications & Dimensions
Weight:0.96 lbs.
Hazardous:No
RoHS Comp:Yes
Warranty:90 days
Need to Return?
Length:5.5 in.
Width:3.5 in.
Height:2 in.
Shipping Information
Extra Shipping Charge:No
Drop Ship:No
Catalog Pages
Catalog/Page:

MCM Cat 57, Page 040

MCM Cat 56, Page 199

PDF Reference

Requires Adobe Acrobat Reader.

Mfr. Info

Pyle Logo
Mfr. Name:Pyle
Mfr. Part Number:PDC21