The first of APB’s ProRack products, these small-format mixers pack a lot of professional features and performance into 10 rack spaces. The chassis design features a unique connector assembly that can freely rotate and be set to any of 3 different angles relative to the front panel. This allows the input and output jacks to be properly positioned whether these mixers are mounted in a vertical rack, slant rack or used on a desk top.
The ProRack audio design is based upon our Spectra series of consoles. This includes the use of minimum phase-shift circuitry (electronic servos replace electrolytic capacitors) and Burr-Brown mic preamplifiers, used in a proprietary front end circuit. While audio quality is paramount, reliability and serviceability were given an equal status. Internal construction is based upon a passive mother board and multiple active daughter boards as developed for Spectra Consoles. The active electronics of a single input channel is designed onto two field-replaceable electronics modules. Even the power supply is a plug-in assembly that can be field replaced by removing 6 screws. Special care has been taken to reduce RF interference and eliminate any Pin-1 related problems.
The ProRack-House (H1020) and ProRack-Monitor (M1016) each have 16 input channels in total. The house version has 12 mono input channels and 4 dual-mono/stereo input channels (20 mic preamps in total); while the monitor version is fitted with mono inputs for all 16 channels. The mono input channels of each model share the same Input and EQ circuitry and controls: 48 volt phantom power switch, Mic/Line switch, Mic Pad switch, and polarity reverse switch.
Variable frequency high-pass filters are included on all input channels (Mono and Stereo) with a 20Hz to 400Hz sweep range at a 12dB per octave attenuation rate. For comparison, many available rack mixers incorporate fixed-frequency high-pass filters that offer only a single cut-off point. The ProRack variable frequency filter, as found on most large format consoles, enables detailed, tunable control for the removal of unwanted frequencies such as stage rumble and low frequency signal leakage.
The ProRack Mono input channels incorporate fixed high and low frequency EQ bands and two mid-sweep EQ bands with one-octave bandwidth. This EQ is based on the Spectra-C mono input EQ and includes an EQ On switch with LED. The Stereo channels of the H1020 feature fixed high and low frequency EQ bands and a single mid-sweep EQ based on that same Spectra circuitry.
The ProRack-House (H1020) includes 6 aux send controls; 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 with Aux pot 5 becoming the pan control to buses 5-6 while Aux pot 6 controls the overall level of the pair. All Auxiliary mixes have bus input and TRS insert connectors and XLR balanced output connectors.
On the ProRack-House, the operator can assign the channels to Left-Right, Center and Mono mix buses and to analog subgroups 1-2 and 3-4 (L-R and subgroup assignments are always in pairs through the pan pot). Large, internally illuminated Mute and PFL switches are provided along with 6-segment LED metering and high quality 100mm faders; the same as used in the Spectra series consoles. Each of the four main buses has bus input and TRS insert connectors and XLR balanced outputs. The Left, Right, Center and Mono outputs may be individually switched from their normal output level (+4dBu) to mic level (-25dBu) to increase the versatility of the unit when used in rental applications or when a mic-level signal is the only way to feed a sound system. (Some older high school auditoriums and gymnasiums or when expanding the input capacity of a house mixerwhere only a mic level XLR connector is available).
The ProRack-Monitor (M1016) is unique in that it can create 8 Stereo mixes PLUS 2 Mono mixes all from a 10-space rack-mount mixer. The input and EQ sections are identical to the Mono input channels of the ProRack-House with the added feature of a passive input-splitter system with ground-lift switch. In most applications, this enables adding a ProRack-Monitor into a sound system without the need of an expensive external splitter system.
All eight stereo mixes are generated from the input channels using rotary controls for level and small, horizontally-mounted slide faders (with center-detent) for panning. Two additional mono mixes on rotary controls are provided that can be sourced pre or post the channel’s master level control. Each channel also includes separate, internally illuminated PFL and Mute switches and 6-segment LED meters.
Stereo outputs are fitted with 60mm high-quality faders, separate left & right LED metering, internally illuminated Solo and ute switches and a separate stereo return input. The stereo return can be used for effects return into a mix or as input for click-track or pre-recorded instrument tracks. Each of the 18 outputs (8 stereo mixes and 2 mono mixes) have XLR balanced connectors and insert points on TRS connectors. The eight stereo return inputs (via 16 TRS connectors) feed the return fader located next to each of the output faders.
APB Dynasonic's goal in designing the ProRack series was to provide the user with audio quality, reliability and serviceability equal to our desktop Spectra in a rack-mountable package. Rather than design these products with a minimalist, low-cost feature and performance set, we built the ProRack with the most important features and the performance required for professional applications.
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- 16 Mono mic/line input channels, all with Spectra-quality microphone preamplifiers in a 10u (17.5” in x 19”) package.
- Built in Passive microphone splitter system on rear panel with Pin 1 lift switches.
- Minimum phase shift circuitry and internal Mother /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.
- Variable frequency high-pass filters on all input channels with a 20Hz to 400Hz sweep range at 12dB per octave.
- Input channels feature fixed high and low frequency EQ bands and two mid-sweep EQ bands, with EQ On switch with LED, The EQ internal design is based upon Spectra circuitry.
- Two (2) Mono mixes switchable between a pre or post fader source and include XLR balanced outputs and pre AFL (solo) TRS insert points.
- Eight (8) Stereo mixes, each with concentric level control and pan fader. These outputs each have balanced XLR outputs, Line (bus) inputs with each pair routed through return faders associated with each stereo master output section and pre AFL (solo) TRS insert connectors. Output may be selected to mono operation by front panel switch, making use of only the left inset point feeding both left and right output connectors.
- Internally illuminated Mute and PFL/AFL switches along with 6-segment LED channel metering on all input channels.
- Eight sets of 10x2 segment output meters on each of the 8 Stereo Output master sections. Master output level is controlled from eight (8) 60mm stereo faders, with each of these output sections having internally illumined Mute and AFL switches. Bus level signal monitoring using bi-color LED's are provided on each stereo mix bus pair.
- 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.
- 100-240 VAC, 50/60Hz Power Supply - Field replaceable (plug in) without disassembly of mixer.
- Adjustable lamp dimmer provided for the 4-Pin XLR connector for use with (optional) gooseneck lamp.
http://www.apb-dynasonics.com/Downloads/proRack/ProRack_Monitor_lit.pdf
http://www.apb-dynasonics.com/Downloads/proRack/ProRack_dimensions.pdf
 input pannel will also rotate to a 45 degree angle
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