APB ProRack-House H1020
Detailed introduction


     ProRack-House (H1020) Feature Overview:

  • 20 Microphone pre-amplifiers in total. 12 Mono mic/line input channels and 4 Dual-Mono/Stereo mic/line input channels, all with Spectra-quality microphone preamplifiers in a 10u (17.5" in x 19") package.
  • Minimum phase shift circuitry and internal Mother Board/Daughter Board construction derived from the Spectra console design.
  • 48 volt Phantom Power switch, Polarity Reverse switch, Mic/Line switch, Mic Pad switch on input channels. (Combo mic/line/pad switch on stereo input channels).
  • Variable frequency high-pass filters on all Mono and Stereo input channels with a 20Hz to 400Hz sweep range at 12dB per octave.
  • Mono input channels feature fixed high and low frequency EQ bands and two mid-sweep EQ bands, with EQ On switch with LED. The Stereo channels feature fixed high and low frequency EQ bands and a single mid-sweep EQ based on Spectra circuitry.
  • Six aux sends; each pair of sends switchable between a pre or post fader source. In the pre-fader position, an additional front panel switch determines if that pre-fader signal is derived pre or post EQ. Aux controls 5 and 6 may be switched to become a stereo pair.
  • All channels can assign to Left-Right, Center and Mono mix bus assignment along with additional assignment switches to subgroups 1-2 and 3-4. These outputs (including aux outputs) each have balanced XLR outputs, TRS bus inputs and TRS insert connectors.
  • Left-Right, Center and Mono mix output level can be switched from line level to mic level.
  • Internally illuminated Mute and PFL/AFL switches along with 6-segment LED channel metering and 100mm faders on all input channels.
  • Four LED meters can monitor the Left, Right, Center and Mono outputs or the Group 1-4 outputs. Meters auto-switch to show Solo levels.
  • Bus level signal monitoring using bi-color LED's on all 14 mix buses: Left, Right, Center, and Mono, Groups 1-4, and Aux 1-6.
  • 100-240 VAC, 50/60Hz Power Supply - Field replaceable (plug in) without disassembly of mixer.
  • Rear panel rotates and may be locked in any of three preset angles (referenced to the front panel) - 90 degrees, 135 degrees, or 180 degrees.
  • Adjustable lamp dimmer provided for the 4-Pin XLR connector for use with (optional) gooseneck lamp.

ProRack-House (H1020) Rear Panel 

ProRack Internal Hybrid Construction
including plug in active electronics.


ProRack-House (H1020) Specifications:
Frequency Response (Any input to any output) +0/-0.5dB 20Hz to 20kHz (ref to 1kHz)
Phase Response (Mic input to Main Output) +10/-15 degrees, 20Hz to 20kHz (ref 1kHz)
THD + Noise (Mic Input to Main Output) <0.01% @ 15dBu output

Noise: All measurements ref to 20Hz to 20kHz Bandwidth unless noted. Mic EIN

-128dBu @ 60dB gain, 150 ohm source
Main Bus (L-R-C-M) Output Noise -85dBu (all Channels assigned w/faders down, Master fader at unity).
Group Bus Output Noise -85dBu (all Channels assigned w/faders down. Group fader at unity).
Aux Bus Output Noise -90dBu (Aux Sends down. Aux Master at unity).

Interconnect Features (H1020):

  • Direct outputs on all input channels.
  • Inserts on all Mono input channels, Aux, Group, and Main outputs.
  • Bus inputs on all 14 mix buses (Aux, Groups, Mains) to allow for easy expansion through linking of units.
  • Both 1/4" and 1/8" Headphone connectors are provided.
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