Symetrix Inc. Mountlake Terrace, WA, USA Tel (425)778-7728 Fax (425)778-7727 www.symetrixaudio.com

APPLICATIONS

Restaurants, Pubs, Bars

Conference Rooms

Multi Zone Paging

Church and School Public

Address

Hotel Convention Facilities

450

450 Dual Zone Priority Mixer

HE 450 DUAL ZONE PRIORITY MIXER satisfies the requirements for paging mic andmono/stereo line mixing in clubs, restaurants, hotels, conference facilities, houses of

worship or anywhere multiple audio inputs must be combined and distributed. The compact onerack space mixer accepts two mono mic/line inputs (with +48V phantom power and low frequencyfilters) and four stereo line inputs.

FEATURES

Separate stereo and mono

output zones

Four stereo inputs (may be

used as mono)

Two mic/line inputs with +48v

phantom power

Three inputs have priority

override capability

Remote volume control

capability

Uncompromising sound quality

Each input may be assigned to a stereo outputzone, a mono output zone or both. A uniquehierarchical priority structure permits both mic/line inputs and the first stereo line input tohave priority over the other inputs assigned tothe same zone. For example, in a typicalconfiguration, a paging microphone assigned tothe stereo zone will have priority over abackground music source (connected to lineinput 5-6) in that zone. A jukebox (connectedto line input 3-4) in the same zone will havepriority over the background music, but thepaging signal will retain ultimate priority and

OVERRIDEPRIORITY

ZONE 2 OUT (STEREO)ZONE 1 OUT (MONO)LINE IN 9-10LINE IN 7-8LINE IN 5-6LINE IN 3-4 (PRIORITY 3)MIC/LINE IN 2 (PRIORITY 2)MIC/LINE IN 1 (PRIORITY 1)

450DUAL ZONEPRIORITY MIXER

UUUUUUUU

+15dB+15dB+15dB+15dB+15dB+15dB+15dB+15dB ∞∞LOW BYPASS

MASTERMASTER

+15

0

-30

-15

+15

0

-15

-30

ZONE ASSIGNZONE ASSIGNZONE ASSIGNZONE ASSIGN

∞

GAIN

∞

GAIN

∞

GAIN

∞

GAIN

∞

GAINZONE ASSIGN

∞POWER

PRIORITYOVERRIDE

BYPASSLOW

ZONE 1

ZONE 2

ZONE 1

ZONE 2

ZONE 1

ZONE 2

ZONE 1

ZONE 2

ZONE 1

HIGH PASSZONE 2

RL

GAIN

HIGH PASSZONE 2

ZONE ASSIGN

ZONE 1

T

Mono OverrideSensitivity

Stereo OverrideSensitivity

Mic/Line 1

Mic/Line 2

Lines 5-6

Lines 3-4

Lines 7-8

Lines 9-10

Mic Pad

Mic Pad

Level

LevelMono Level

Stereo Level

OutputZone Assign

ChannelLevelInputs

Priority/Override Circuits Outputs

Level

Level

Level

Level

Low Cut

Low Cut

Mono

Stereo

Mono

Stereo

Mono

Stereo

Mono

Stereo

Mono

Stereo

Mic/Line

Mic/Line

Mono

Stereo

VCA Mono Output

Remote VolumeControl Input

Remote VolumeControl Input

VCA Stereo Output (Left)

VCA Stereo Output (Right)

Priority 1

Priority 2

Priority 3

Priority 1

Priority 2

Priority 3

X Mute

X Mute

X Mute

X Mute

X Mute

X Mute

force muting of both the jukebox and thebackground music whenever the page mic isused.

As a result of its inherent flexibility the 450 is aperfect low cost solution for many small systemrequirements. By accepting audio inputs fromvirtually any type of audio source and selec-tively routing to either the mono or stereooutput zone the 450 can save you time andmoney in the design and installation of yournext project. •

Publication ©1997 Symetrix, Inc. Symetrix Inc. Mountlake Terrace, WA, USA Tel (425)778-7728 Fax (425)778-7727 www.symetrixaudio.com

450 Dual Zone Priority Mixer

The audio microphone and line mixer shallbe a high performance unit occupying asingle rack space (1U).

The unit shall have two low impedance,balanced microphone/line inputs withconnection via female XLR. Eachmicrophone/line input shall have a rearpanel push-button which shall bypass themic preamp circuitry. Each input shall alsohave a switch to reduce the gain of the micinput by 20dB. Associated with eachmicrophone input shall also be a frontpanel level control potentiometer whosepurpose is to establish the level of themicrophone channel as it is mixed toeither a mono output zone, a stereo output

450 ARCHITECTS AND ENGINEERS SPECIFICATIONS

SPECIFICATIONS

AudioMicrophone Inputs Two, Low Impedance, BalancedMic Common Mode Rejection @ 1 kHz, 1V RMS >85 dBPhantom Power +24V (10ma per input max)Line Inputs Four, StereoLine Input Impedance >10k Ohms, BalancedLine Input Common Mode Rejection @ 1 kHz, 1V RMS >40 dBMaximum Line Input Leve +24 dBu Balanced, +18 dBu UnbalancedFrequency Response, Any Input to Any Output ±1 dB, 20 Hz to 20 kHz

ConnectionsMicrophone Input XLR Female (pin 2 high)Line Input 1/4" TRS (tip is high), RCA-phono (Unbalanced)Line Output 1/4” TRS (tip is high)Remote Volume Control Inputs 1/4¼" TRS

priority inputs shall mute or duck all lowerpriority inputs that are assigned to it’soutput zone when audio is present at it’s(the higher priority) input. There shall be athreshold control in each zone mastersection which determines the minimumlevel of audio that will trigger the muting/ducking function. Priority shall beassigned as follows: Mic/Line In 1 –Priority 1, Mic/Line In 2 – Priority 2, LineIn 3-4 – Priority 3, Line In 5-6, 7-8, 9-10 –No Priority.

Independent master output level controlsshall be provided for both the monauraloutput zone and the stereo output zone.LED peak meters shall indicate the actual

Specifications subject to change without notice.

zone, or both simultaneously. Eachmicrophone input shall also have a firstorder low cut filter with a 100 Hz roll-offfrequency.

The mic/line mixer shall have four stereo,line level inputs. Each input shall beassignable to either a monaural outputzone, a stereo output zone, or both.Associated with each line input shall be alevel control potentiometer whose purposeis to establish the level of the line levelinput signal as it is mixed to either a monooutput zone, a stereo output zone, or bothsimultaneously.

The 450 shall incorporate a four levelpriority muting system as follows. High

output level regardless the nature of theload.

Independent means shall be provided toremotely control the output level of themono output zone and the stereo outputzone. Rear panel jacks shall be provided toaccept connections from standard 50Klinear potentiometers for this purpose.When wired for remote control, the frontpanel output zone controls shall bedisabled.

The mic/line mixer shall be a Symetrix,Inc. model 450 Dual Zone Priority Mixer.

450

RIGHT LEFTRIGHT LEFTRIGHT LEFTRIGHT LEFT

MIC/LINE IN 2 (PRIORITY 2)

INOUT

MICLINE

MIC PAD

INPUT SELECT INPUT SELECT

LINEMIC

ZONE 1ZONE 2

SUPPLY ONLY.OR PS-3E POWERSYMETRIX PS-3CONNECT TO

PARTS.NO USER SERVICABLETHIS UNIT CONTAINS

MANUFACTURED IN LYNNWOOD, WA, USA

OUTIN

MIC PAD

(MONO)

(PRIORITY 3)LINE IN 3-4

(MONO)

LINE IN 5-6

RIGHT LEFT

(STEREO)

ZONE 2

REMOTE CONTROL

ZONE 1

(MONO)

LINE IN 9-10 MIC/LINE IN 1 (PRIORITY 1)

(MONO)

OUTPUTS

450 DUAL ZONE PRIORITY MIXER(MONO)

LINE IN 7-8

PhysicalSize (hwd) 1.72 x 19 x 6.5 inches, 4.37 x 48.26 x 16.51 centimetersWeight 8 lbs (3.64kg) net

ElectricalPower requirements 117V nominal, 95 to 130V AC, 50 to 60 Hz, 15 watts

230V nominal, 165 to 255V AC, 50 Hz, 15 watts