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Black Box Analog Design HG-2

Line Level Tube Saturation Unit for Stereo Buss Processing

  • Black Box Analog Design HG-2
  • Black Box Analog Design HG-2 Rear


Price: $2,695.50

(You save $299.50)

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Stock Item, Usually Ships Same or Next Business Day

Stock Item: Ships from our shelf quickly in almost all cases when ordered before our ship cutoff times.

Direct Ship: Non-stock item, but normally ships quickly from the manufacturer or alternate warehouse.

Built To Order: Item is custom built per the options chosen and quickly shipped out upon completion.

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Product Description

Feed the HG-2 from any device's line level output, instrument, preamps, outboard gear or your mix buss...when you want that saturated compression effect!

Mix bus, meet your new best friend.

The Black Box Analog Design HG-2 is a line level, stereo unit designed to add saturation, harmonics, natural compression, increased RMS and enhancement during mixing and mastering. It is designed to easily and naturally do what usually requires multiple pieces of gear and do it better!

Tubes, transformers & tone!

The HG-2 uses Cinemag input transformers to feed two paths: The main signal path travels through a 6U8A Pentode tube stage that then drives into the Triode stage that follows, resulting in everything from subtle harmonics to full on saturation.

Also fed from the input transformer is a parallel signal path that utilizes a set of 12AX7 tubes, voiced specifically for harmonics and saturation. This parallel saturation circuit is outfitted with a 3 way “Freq. Select” switch that allows the user to choose the frequency content of the signal feeding the circuit. The “low position saturates just the low mids and sub frequencies, the “flat” position saturates full bandwidth and the “high” position saturates only the high mids and high frequencies. The result is the ability to add top end to dull tracks, enhance low end or enhance and add energy to the entire signal. The “harmonics” knob allows the user to control how much of the processed, parallel signal is fed into the main signal before hitting the Pentode stage. Finally, both stages reach the passive output attenuation before a pair of Cinemag output transformers.

In addition to the saturation stages, an “air” switch adds a subtle top end lift and the “alt” tube button switches between two different 12AX7 tubes in the parallel circuit. Switching between tubes allows the user to swap tubes for different types of saturation and switch back and forth instantly.

The meter select chooses whether the meter is fed from the input or output, and the “bypass” switch is a true bypass that shorts the input directly to the output with no additional circuitry in line.


  • High voltage Pentode & Triode tube stages
  • Parallel saturation with mix control
  • 3 way frequency control over parallel saturation
  • Instantly selectable/swappable saturation tubes
  • “Air” lift
  • Cinemag input and output transformers
  • True bypass
  • Selectable 30 segment meter (VU / PPM)
  • Illuminated push button switches & sealed relays
  • Heavy duty steel chassis
  • 115V / 230V switchable power supply

Product Videos

Black Box Analog Design HG-2 [Review] 08:39

In-depth review of the HG-2 · Tube mix bus enhancer · Harmonic overtones · Even and odd order harmonics · Tubes vs. transistors vs. plug-ins - MUSIC Used with kind permission by the respective copyright owners. Documentation can be obtained by contacting the email below. Gear Grotto theme music © Turkman Souljah/Hideout Background music 1 © Wafande/Pharfar/Musicall/Ultra Galla Background music 2 © Diamond/FishCorp Music example 1 © Borneland/Music For Dreams Music example 2 © Kato/Big Fish/disco:wax LEGAL Gear Grotto has not received any monetary compensation, free hardware or software as payment from the companies whose products are mentioned in this video, neither is Gear Grotto affiliated with the companies or persons representing these companies. Gear Grotto is a subsidiary of Platinum Audio Group, Denmark. CONTACT Please contact Holger Lagerfeldt at with any enquiries.

  • Black Box Anal...
    In-depth review of the HG-2 · Tube mix bus enhancer · Harmonic...
  • Black Box Anal...
    Audio examples of the HG-2 on various sources and with multipl...

Warranty Information

Our ONE WITH EVERYTHING ZEN WARRANTY extends the standard manufacturer warranty by one year, see our ZEN WARRANTY page for details.

Customer Reviews / Q&A Discussion

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