Henry Engineering PATCHBOX-II
Output Multiplier, Stereo


Patchbox II is a "must have" for your gadget bag! It's a "splitter" that can take the output of a mixer, and split it into 12 different outputs. It's perfect for remotes, when you need to feed a mixer to a PA system, tape decks, studio link, telco coupler, etc. Patchbox II is passive; it needs no batteries or power.

PatchBox II is a passive "output multiplier" that can be used to distribute the output of a professional audio mixer to the inputs of peripheral equipment. PatchBox II is ideal for feeding a mixer’s output signal into DAT recorders, digital editors, computer sound cards, cassette and reel decks, VCRs, PA systems, dubbing racks, limiters, and other audio equipment. Both professional equipment with balanced inputs and consumer equipment with unbalanced inputs can be used.

PatchBox II is compatible with any active balanced (transformerless) low impedance signal source that is ground-referenced. (Most professional mixers built since the early 1980s use this topology.)

From a stereo source, PatchBox II creates twelve stereo outputs: six balanced stereo outputs and six unbalanced stereo outputs.

PatchBox II balanced outputs, on XLR and ¼" TRS connectors, provide a "unity gain" signal with a 600 ohm source impedance. PatchBox II unbalanced outputs, on gold-plated RCA connectors, provide a signal that is compatible with the inputs of consumer gear. Because the inputs circuits of audio equipment are normally high-impedance ("bridging"), any combination of outputs can be used simultaneously without interaction or signal degradation.


  • Inputs: Left and Right on TRS connectors; Balanced, low impedance, ground referenced; Any professional level, +4dBu typical
  • Balanced Outputs: Level: Unity gain; Load: 3k ohms or higher; 2 stereo pairs on XLR connectors; 4 stereo pairs on TRS connectors
  • Unbalanced Outputs: Level: 10dB below input level; Load: 10k ohms or higher; 6 stereo pairs on RCA connectors
  • Frequency Response: DC to 50kHz
  • Noise, Distortion: None
  • Dimensions (W x H x D): 6" x 3.5" x 2.5"
  • Weight: 2 lbs
  • Construction: Aluminum enclosure and front panel

WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.

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