System cards fit in 4RU card frame or can be mounted in 2 RU chassis.

The input/output connector is a Sullins 36/72 pin dual row connector.

Audio power supply rails are +/-18 VDC

Relay voltage is 12VDC - all relays are fed DC and require a ground closure.

Logic voltage is 5VDC

Relay and logic voltage share ground.

For information about our discrete opamps and the way we lay them out,check out the opamp page.

4RU 0 Extender

Single piece or system price $125.

4RU #3 Five Mic preamps for talkback & Listen back/ Stereo solo summing / Oscillator.

Single piece or system price $300.

4RU #5 Source switching for studio & three cues.

For use in large master section systems.

This card required unbalanced sources to be fed from 4RU #8

This card requires an output card, either 4RU #6 or multiple 4RU #13 cards.

Each of the three cues switch between three unbalanced sources and unique differential inputs. Differential inputs are stereo and use a Burr Brown OPA2134.

This card uses three line BCD decoders for source selects.

The card is also designed to source select for studio loud speakers (SLS). SLS source can be selected between the three unbalanced sources above and the control room select.

If you require these cues to be soloed into the control room the card can not be fit with the SLS portion.

Single piece or system price $250

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4RU #6 Outputs for three stereo cues & SLS.

Stereo Output amplifiers for four stereo inputs

Mute, dim, & talkback relays available for each pair.

Output balanced with DRV134 IC.

For use with 4RU #5.

Single piece or system price $325.

4RU #7 Stereo in / Sum, offset/ Stereo solo summing amplifiers.

Balanced input for monitoring stereo buss on large systems. Input is either differential or transformer input. Output is unbalanced, doubled on two set of pins and is designed to feed 4RU #12 and 4RU #5 the Stereo buss.

Sum is used with multiple 4RU #8 cards in a large monitoring system to sum to columns together. Offset trim is used to adjust the level on a choosen column for matching level off two track returns.

Stereo solo summing amplifiers are used in a console and fed out through a pot and into solo input on cards 4RU #12 or 4RU #15.

Single piece or system price $325.

4RU #8 Source switching card for column.

Eight stereo balanced sources with differential or transformer input.

Differential available discrete or IC.

Transformer has discrete or IC dual emitter follower.

Outputs are unbalanced.

Single piece or system price $350 (Differential & Discrete).

4RU #10 Stereo Buss Card

Voltage or current summing input opamp.

Insert send balanced on board with DRV134 IC or external output transformer.

Switchable insert return: Insert out, A return, B return.

Differential insert return.

Fader loop.

Output amp driving four outputs.

Two outputs balanced with Burr Brown DRV134 ICs, two outputs balanced with split winding off output transformer.

Card can also be used for buss or aux summing.

Available with mute, solo & with jumpers for talk back.

Single piece price $750

4RU #12 Control room & studio source for large system.

Unbalaced input A column, B Column, Stereo source, aux input, stereo solo.

Dual buffered meter outputs

Swap & mono function

Meter outputs switchable between stereo buss or follow control room select.

Available with solo over function.

Dim function for relative dim.

Studio source select: A Column, B Column, Stereo Buss, Follow Control room.

Outputs for control room pot & dim pot.

Return for Dim pot used with relative dim.

Single piece price $325.

4RU #13 Control room output.

Inputs from control room pot and dim pot for isolated dim.

Outputs four pairs of speakers with trims selectable with BCD Decoder.

Isolated dim for control room

Dim function for talk back / listen back

Dim function available for Left and right separately for use in 5.1 system

Left, Right and Dual speaker cut.

Balanced output via output transformer or DRV134 IC.

Single piece price $650.

4RU 13 Headphone amp.

Same card as above but stuffed as Stereo headphone amplifier.

Left, Right, and dual cut.

Single piece price $200