RDL SYS84B-RST-01 Data Sheet

System 84 Models A and B

Audio Routing/Mixing Matrix

 Audio Routing / Mixing Switcher
 Eight Stereo Inputs (Model A) / Eight Mono Inputs (Model B)
 Four Stereo Outputs (Model A) / Four Mono Outputs (Model B)
 Logic Controlled Soft Switching
 All Solid-State Audio Switches – No Relays In Audio Path
 Balanced/Unbalanced Inputs and Outputs On Plug-in Connectors
 Gain-Trim On Each Source
 Any Input May Be Assigned To Any (Or Every) Output
 Multiple Inputs May Be Combined To an Output
 Constructed With True Summing Capabilities
 Direct Mix Inputs For Expansion
 Low-Noise Performance
 Uses Only a Single Rack-Unit Space

The System 84 Model A and B are both digitally controlled matrix routers and low-noise audio mixers with
eight inputs which can be mixed to four outputs in any combination. Functions are controlled by 32 logic
lines on a single input connector (provided). Dry contacts may be used to select each function, or the
System 84 may be software controlled using a computer equipped with a logic-control In/Out card.

Audio inputs and outputs feature plug-in connectors. Precise-level adjustment is provided on the
rear-panel using multi-turn trimming potentiometers. Instrumentation input amplifiers, noise-free solid
state soft audio switching, studio-quality audio mixing, excellent headroom and low-noise performance
combine to make the System 84 the ultimate in flexible audio system design at a fraction of the cost you
would expect.

RDL  659 N. 6th St.  Prescott, AZ., USA 86301  [phone]  FAX [phone]  www.rdlnet.com

System 84

Audio Routing/Mixing Matrix

(Stereo Model Shown)

Installation/Operation

EN55103-1 E1-E5; EN55103-2 E1-E4

Typical Performance reflects product at publication time
exclusive of EMC data, if any, supplied with product.
Specifications are subject to change without notice.

INPUT CONNECTIONS

INPUT X

GAIN

+

+

L

-

+

SIGNAL

FROM

BALANCED

LINE-LEVEL

SOURCE

GAIN ADJUSTMENT

INPUT X

GAIN

GAIN

+

+

L

R

-

+

GAIN

+

LEFT AND RIGHT

GAIN ADJUSTMENT

25-TURN POTS

INPUT 8 TO OUTPUT 4

INPUT 8 TO OUTPUT 3

INPUT 8 TO OUTPUT 2

INPUT 8 TO OUTPUT 1

INPUT 7 TO OUTPUT 4

INPUT 7 TO OUTPUT 3

INPUT 7 TO OUTPUT 2

GAIN

-

DIRECT INPUTS

L

4

2

3

SIGNAL

FEEDING
BALANCED
LINE-LEVEL
EQUIPMENT

INPUT X

GAINRGAIN

+ +

L R

+

SIGNAL

FROM

UNBALANCED

LINE-LEVEL

SOURCE

RDL

ROUTING CONTROL 64-PIN HEADER

INPUT 7 TO OUTPUT 1

INPUT 6 TO OUTPUT 4

INPUT 6 TO OUTPUT 3

INPUT 6 TO OUTPUT 2

INPUT 6 TO OUTPUT 1

INPUT 5 TO OUTPUT 4

INPUT 5 TO OUTPUT 3

INPUT 5 TO OUTPUT 2

INPUT 5 TO OUTPUT 1

INPUT 4 TO OUTPUT 4

LEFT SIDE OF SYSTEM 84 CHASSIS (FRONT OF CHASSIS)(REAR OF CHASSIS)

OUTPUT CONNECTIONS POWER CONNECTIONS

24V

R

4

21 1 3

FRONT PANEL

TM

INPUT 4 TO OUTPUT 3

INPUT 4 TO OUTPUT 2

INPUT 4 TO OUTPUT 1

INPUT 3 TO OUTPUT 4

INPUT 3 TO OUTPUT 3

L OUTPUTS

1 2

--

+

++

STATUS

IDLE

INPUT 3 TO OUTPUT 2

INPUT 3 TO OUTPUT 1

INPUT 2 TO OUTPUT 4

R OUTPUTS

4

3 1

-

- --

-

+ +

ACTIVE

INPUT 2 TO OUTPUT 3

INPUT 2 TO OUTPUT 2

INPUT 2 TO OUTPUT 1

INPUT 1 TO OUTPUT 4

4

32

-

+ +

+

SIGNAL

FEEDING

UNBALANCED

LINE-LEVEL
EQUIPMENT

THE TWO FRONT PANEL LED'S ON THE
SYSTEM 84 INDICATE INPUT CHANNEL
ACTIVITY. IF THERE IS NO INPUT CHANNEL
ACTIVITY, THEN THE IDLE LED WILL BE
ILLUMINATED. IF ANY OF THE INPUT
CHANNELS ARE ACTIVE, THEN THE ACTIVE
LED WILL BE ILLUMINATED. IF THERE IS NO
POWER TO THE UNIT, THEN NEITHER LED WILL
BE ILLUMINATED.

LOGIC CONTROLLED ROUTING SWITCH CONTROLLED ROUTING RELAY CONTROLLED ROUTING

INPUT 1 TO OUTPUT 3

INPUT 1 TO OUTPUT 2

INPUT 1 TO OUTPUT 1

INDIVIDUAL LOGIC ROUTING
LOGIC GROUNDS

RDL

DC

SYSTEM 84

MADE IN U.S.A.

PWR

SERIAL NO:

24 VDC

OR

SOURCE SOURCE

LOGIC

24V
AC

PWR

24 VAC
POWERPOWER

MULTIPLE SYSTEM84

DIRECT MIX CONNECTIONS

DIRECT INPUTS

L R 1

32 41243 1

-

+

Multiple System84's can be
connected together by
routing the outputs of one
System84 to the Direct Mix
inputs of another System84
(via unbalanced
connections), creating a 16
input by 4 output stereo
matrix in this example.
Co-located System84's can
be daisy-chained together in
this fashion. The Direct Mix
inputs will accept any
unbalanced line-level audio
source.

L OUTPUTS

2

3 4 1 32 4

+

+ +

DIRECT INPUTS

L R

R OUTPUTS

- --+---

+ +

2 3 42143 1

L OUT

1

-

-

+

2

-

++

TYPICAL PERFORMANCE (Common to System 84 Models)

Inputs (switched): 8 10 k balanced or unbalanced via plug-in terminal block, line-level
Inputs (direct): 8 Unbalanced via plug-in terminal block, -2 dBu
Input Level: -10 dBu to +8 dBu (for +4 dBu output) Max input +24 dBu
Headroom: > 18 dB above +4 dBu
Gain: Adjustable for each input, 25-turn trimmer, -6 dB to 12 dB
Frequency Response: 10 Hz - 30 kHz +/-0.25 dB(Bridging load)
THD+N: < 0.010% (20 Hz - 20 kHz)
Intermodulation Distortion: < 0.025% (20 Hz - 20 kHz)
Input Channel Crosstalk: Left into Right: Better than 80 dB (10 Hz – 15 kHz)

Left into Right: Better than 75 dB (15 kHz – 20 kHz)
Right into Left: Better than 70 dB (10 Hz – 15 kHz)

Right into Left: Better than 65 dB (15 kHz – 20 kHz)
Residual Noise: < -80 dB (Channel ON; referred to +4 dBu)
Off Attenuation: > 80 dB (10 Hz - 20 kHz) with adjacent input channels OFF

> 80 dB (10 Hz - 10 kHz) ; > 75 dB (10 kHz - 20 kHz) with adjacent input channel ON
Indicators: Front panel LEDs indicating activity: IDLE if no channel active; ACTIVE if any channel active
CMRR: > 50 dB (50 to 120 Hz)
Outputs: 4 Balanced, 150  balanced or unbalanced via plug-in terminal block
Power Requirement: 24 Vdc @ 575 mA, Ground-referenced; OR 24Vac @ 575mA (separate jacks)
Mounting: Standard 19” Rack-mount ; 1RU
Dimensions: Height: 1.75 in. 4.4 cm

Length: 19.0 in. 48.3 cm

Depth: 8.00 in. 20.3 cm

Radio Design Labs Technical Support Centers

U.S.A. [phone], [phone]; Fax: [phone]

891-0305G

Europe [NH Amsterdam] (++31) 20-6238 983; Fax: (++31) 20-6225-287