Monoprice 31028 User Manual Download Page 28

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SPECIFICATIONS

Model

31028

Number of Zones

Continuous Output Power (per zone)

30 watts/channel into 8 ohms@1kHz
50 watts/channel into 4 ohms@1kHz
100 watts bridged into 8 ohms@1kHz
30 watts/channel 70V/100V@1kHz

Frequency Response

20Hz ~ 20kHz ±1dB

Total Harmonic Distortion

0.1%@10W

Signal-to-Noise Ratio

90dB A-weighted 1kHz

Channel Separation

65dB 1kHz

Input Sensitivity

600mV@30W

Bass Control

100Hz ±12dB

Treble Control

10kHz ±12dB

Line Input Impedance

47 kilohms

Master Control Input Voltage

+3 ~ +30 VDC@1mA

Master Control Output Voltage

+11.5 VDC@1mA ~ 10 VDC@5mA

Zone Line/Bus Trigger Input Voltage

+3 ~ +30 VDC@1mA

Zone Mute Trigger Input Voltage

+3 ~ +30 VDC@1mA

Zone Status Output Voltage

+12 VDC

RS-232 Communications Parameters

9600/8-N-1

RS-232 Flow Control

None

Input Power

115 VAC, 60 Hz, 10A or 230 VAC, 50Hz, 5A

Dimensions (without rack ears)

16.9" x 3.5" x 16.4" (430 x 88x 416 mm)

Weight

48.5 lbs. (22 kg)

Summary of Contents for 31028

Page 1: ...6 Zone Home Audio Multizone 12 channel Amplifier P N 31028 User s Manual ...

Page 2: ...IR Remote Control 11 SAMPLE CONNECTION DIAGRAM 12 CONSTANT VOLTAGE VS LOW IMPEDANCE SPEAKER SYSTEMS 13 WIRE GAUGES 14 LINE CONNECTIONS 15 Line In 15 Bus Audio 15 SPEAKER CONNECTIONS 16 4Ω 8Ω Stereo 16 Bridged 8Ω Mono 17 Constant Voltage 70V 100V Stereo 18 TRIGGER CONNECTIONS 19 Line Bus Trigger In 19 Master Control In 19 Master Control Out 20 Mute In 20 ...

Page 3: ...RS 232 COMMANDS 21 RS 232 Commands 22 RS 232 Queries 24 Zone Status 24 Volume Level 25 Bass Treble Level 26 Balance Setting 27 TECHNICAL SUPPORT 27 SPECIFICATIONS 28 REGULATORY COMPLIANCE 29 Notice for FCC 29 Notice for Industry Canada 29 ...

Page 4: ...not modify the plug or use a cheater plug to bypass the ground connection Do not expose this device to excessively high temperatures Do not place it in on or near heat sources such as a fireplace stove radiator etc Do not leave it in direct sunlight This device ventilates excessive heat through the slots and openings in the case Do not block or cover these openings Ensure that the device is in an ...

Page 5: ...to confirm zone status and settings It has an Audio Bus IN which can be manually selected using the remote control RS 232 commands or a voltage trigger The voltage trigger will switch the zone to use the Audio Bus IN as long as there is voltage present on the zone Line Bus Trigger IN When the voltage is removed the zone automatically switches back to the zone Line IN making it ideal for global pag...

Page 6: ...r each zone Master global Control In and Control Out Detachable screw terminal connectors for Zone IR IN Zone Mute Zone Status OUT and Zone Speaker Outputs Global optical S PDIF and analog stereo 3 5mm audio inputs for the global Audio Bus IN OUT Rack mountable in a standard 19 equipment rack 2U height Selectable 110 120 VAC 60Hz or 220 240 VAC 50Hz power input CUSTOMER SERVICE The Monoprice Custo...

Page 7: ... Six LEDs illuminate solid green when a stereo zone is ON and is off when the zone is OFF 2 PEAK OUTPUT LEDs Six LEDs illuminate red when the amplifier is within 5 of the maximum volume setting To be safe back off the volume a bit when this LED illuminates to prevent damage to the amplifier or speakers 3 RACK EARS Two rack ears for mounting the amplifier in a standard 19 equipment rack 2U height I...

Page 8: ...ack for BUS AUDIO When BUS AUDIO IN is used OPTICAL IN 2 cannot be used and vice versa The analog signal is distributed to the BUS AUDIO OUT 4 and to each zone 4 BUS AUDIO OUT 3 5mm TRS unbalanced stereo output jack for delivering BUS AUDIO to another 6 zone amplifier powered speakers or other line level input device 5 SPEAKER OUTPUT Removable screw terminal plug for connecting the speaker output ...

Page 9: ... is selected when the switch is in the IN position 7 IR IN MUTE STATUS Connect the included IR transmitter to the IR IN and GND terminals to allow for zone IR control using the included IR remote control Connect a 3 30 VDC 1mA control voltage to the MUTE and GND terminals to mute the local zone Connect a trigger enabled device to the STATUS and GND terminals to provide a 12 VDC 1mA Status OUT sign...

Page 10: ...a trigger voltage controlled device that is intended to be automatically turned on or off depending on the amplifier s status Whenever any zone is ON the MASTER CONTROL OUT jack will output 11 5 VDC 1mA 10 VDC 5mA When all zones are OFF the output is 0 VDC 16 POWER ON OFF Rocker switch to turn the amplifier on or off Note that when the switch is set to the OFF position the MASTER CONTROL IN 14 tri...

Page 11: ...d is required to reset the zone balance to center 5 Volume Press the Volume buttons to increase or decrease the overall zone volume level 6 Balance R Press the Balance R button to increase the zone volume level of the right channel relative to that of the left channel Note that an RS 232 command is required to reset the zone balance to center 7 Bass Press the Bass buttons to increase or decrease t...

Page 12: ...12 SAMPLE CONNECTION DIAGRAM ...

Page 13: ...e or in parallel which results in an overall 4 ohm impedance In the first case the 16 ohms impedance effectively halves the output power of your amplifier resulting in lower overall volume levels In the latter case the 4 ohms impedance means that your amplifier will have to work harder and must be rated as stable at 4 ohms Adding a third speaker to the mix would complicate it further producing eit...

Page 14: ... placed in a small room WIRE GAUGES The following tables show the maximum speaker wire lengths using different gauge wires for both 4Ω 8Ω and 70V 100V installations 4Ω 8Ω Installations Maximum Wire Length Wire Gauge 150 ft 46m 16 AWG 400 ft 122m 14 AWG 1000 ft 305m 12 AWG 70V 100V Installations Maximum Wire Length Wire Gauge 350 ft 106m 24 AWG 550 ft 167m 22 AWG 900 ft 274m 20 AWG 1400 ft 426m 18 ...

Page 15: ...US AUDIO IN overrides the zone s LINE IN 10 audio whenever a 3 30 VDC trigger voltage is applied to LINE BUS TRIGGER IN 8 BUS AUDIO IN 3 is a 3 5mm stereo analog input Use a stereo 3 5mm to RCA or 3 5mm to 3 5mm audio cable not included to connect to a stereo line level or headphone level source Alternatively use a digital optical S PDIF cable not included to connect the BUS AUDIO OPTICAL IN 2 to ...

Page 16: ...tions passive stereo 4Ω 8Ω speakers passive bridged monophonic 8Ω speaker and stereo 70V 100V constant voltage speakers 4Ω 8Ω Stereo The basic speaker connection for each zone uses a pair of 4 ohm passive speakers designed to handle up to 50 watts each or a pair of 8 ohm passive speakers designed to handle up to 30 watts each Connect the speakers to the 4 8Ω terminals 2 and 3 4 and 5 then ensure t...

Page 17: ...aker designed to handle up to 100 watts of power Connect the speaker to the Bridge 8Ω terminals 2 and 5 then ensure that the 8Ω 4Ω 70V 100V switch 6 is in the 8Ω 4Ω OUT position and that the Stereo Bridged switch 11 is in the Bridged IN position Note that the only way to get a stereo output using Bridged 8Ω mode by using two zones and splitting the left channel input to one zone and the right chan...

Page 18: ...s of each must not exceed 24 watts 30 watts x 80 Connect the two speaker arrays to the 70 100V terminals 1 and 3 4 and 6 then ensure that the 8Ω 4Ω 70V 100V switch 6 is in the 70V 100V IN position and the Stereo Bridged switch 11 in the Stereo OUT position For installations in the United States the 70V 100V switch 1 must be set to the 70V left position while installations in other countries can be...

Page 19: ...ger In Each zone has a Line Bus Trigger In which is a 3 5mm TS plug Normally the zone outputs the audio signal on the zone s LINE IN 10 RCA audio inputs but outputs BUS AUDIO when a 3 30 VDC 1mA voltage is applied Master Control In The amplifier has a single Master Control In 13 which is used to turn the amplifier on or off To use the Master Control In 13 trigger input place the POWER switch 16 in...

Page 20: ... 3 30 VDC 1mA trigger voltage to mute the audio in that zone When voltage is present the zone is muted When voltage is not present audio will play as normal Connect a two conductor wire from an audio mute trigger source to the GND and MUTE terminals Status Out Each zone has a STATUS OUT 7 connection which provides 12 VDC whenever the zone is active to trigger external trigger controlled devices su...

Page 21: ... from a connected PC to change settings and get status reports RS 232 commands should be issued through any third party RS 232 control software The following table lists the serial communications parameters Baud Rate 9600 Data Bits 8 Parity none Stop Bits 1 Flow Control none The following table explains the meaning and value range for the variables in the RS 232 commands Variable Value Range Descr...

Page 22: ...Increase zone volume one step Zone Volume Decrease z VD Decrease zone volume one step Zone Input Select z IS 0 1 Sets the zone input to BUS or LINE 0 BUS 1 LINE Zone Input Select Toggle z IT Toggles the zone input from BUS to LINE or from LINE to BUS Channel Input Select c CS 0 1 Sets the channel input to BUS or LINE 0 BUS 1 Line Note that setting one channel in a zone will automatically set the p...

Page 23: ... Increase Bass z BI Increase the zone bass level one step Decrease Bass z BD Decrease the zone bass level one step Zone Balance z BA b Sets the zone balance see the Balance Setting table below Zone Balance Step Left z BL Moves the zone balance one step to the left Zone Balance Step Right z BR Moves the zone balance one step to the right Zone Activity Auto Update ZA 0 1 Enables or disables automati...

Page 24: ...ctivity Auto Update function is enabled and something about the zone changes a Zone Status Report will be sent The automatic Zone Status Report will be sent one second after zone activity stops The metadata is also sent whenever it changes The Zone Status Report is a string of characters that conforms to the various RS 232 Commands above The format of the string is as follows z ZS VO v PO 0 1 MU 0...

Page 25: ...1 21 25 2 71 25 22 20 00 3 67 50 23 18 75 4 63 75 24 17 50 5 60 00 25 16 25 6 56 25 26 15 00 7 52 25 27 13 75 8 50 00 28 12 50 9 47 50 29 11 25 10 45 00 30 10 00 11 42 50 31 8 75 12 40 00 32 7 50 13 37 50 33 6 25 14 35 00 34 5 00 15 35 50 35 3 75 16 30 00 36 2 50 17 27 50 37 1 25 18 25 00 38 0 19 23 75 ...

Page 26: ...26 Bass Treble Level Setting Level dB 0 14 1 12 2 10 3 8 4 6 5 4 6 2 7 0 8 2 9 4 10 6 11 8 12 10 13 12 14 14 ...

Page 27: ... you with any questions you may have about installation setup troubleshooting or product recommendations If you ever need assistance with your new product please come online to talk to one of our friendly and knowledgeable Tech Support Associates Technical support is available through the online chat button on our website www monoprice com during regular business hours 7 days a week You can also g...

Page 28: ...65dB 1kHz Input Sensitivity 600mV 30W Bass Control 100Hz 12dB Treble Control 10kHz 12dB Line Input Impedance 47 kilohms Master Control Input Voltage 3 30 VDC 1mA Master Control Output Voltage 11 5 VDC 1mA 10 VDC 5mA Zone Line Bus Trigger Input Voltage 3 30 VDC 1mA Zone Mute Trigger Input Voltage 3 30 VDC 1mA Zone Status Output Voltage 12 VDC RS 232 Communications Parameters 9600 8 N 1 RS 232 Flow ...

Page 29: ...ergy and if not installed and used in accordance with the instructions may cause harmful interference to radio communications However there is no guarantee that interference will not occur in a particular installation If this equipment does cause harmful interference to radio or television reception which can be determined by turning the equipment off and on the user is encouraged to try to correc...

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