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Summary of Contents for Monoprice 31028
- Page 1 6 Zone Home Audio Multizone 12-channel Amplifier P/N 31028 User's Manual...
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Page 2: Table Of Contents
CONTENTS SAFETY WARNINGS AND GUIDELINES ............................4 INTRODUCTION ........................................ 5 FEATURES ..........................................6 CUSTOMER SERVICE ....................................6 PACKAGE CONTENTS ....................................7 PRODUCT OVERVIEW ....................................7 Front Panel ........................................7 Rear Panel ........................................8 IR Remote Control ....................................11 SAMPLE CONNECTION DIAGRAM ..............................12 CONSTANT VOLTAGE VS LOW IMPEDANCE SPEAKER SYSTEMS .............. - Page 3 Status Out ........................................20 RS-232 CONNECTION ....................................21 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 ......................................
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Page 4: Safety Warnings And Guidelines
SAFETY WARNINGS AND GUIDELINES Please read this entire manual before using this device, paying extra attention to these safety warnings and guidelines. Please keep this manual in a safe place for future reference. This device is intended for indoor use only. ... -
Page 5: Introduction
Disconnect the unit from the power source when replacing the fuse. Replace the fuse only with the same type. Clean using a soft, dry cloth only. Do not use chemical cleaners, solvents, or detergents. For stubborn deposits, moisten the cloth with warm water. ... -
Page 6: Features
If you have any problem with your order, please give us an opportunity to make it right. You can contact a Monoprice Customer Service representative through the Live Chat link on our website www.monoprice.com during normal business hours (Mon-Fri: 5am-7pm PT, Sat-Sun: 9am-... -
Page 7: Package Contents
PACKAGE CONTENTS Please take an inventory of the package contents to ensure you have all the items listed below. If anything is missing or damaged, please contact Monoprice Customer Service for a replacement. 1x Amplifier 1x IR remote control 1x IR transmitter... -
Page 8: Rear Panel
Rear Panel 1. 70V/100V HIGH VOLTAGE SPEAKER OUTPUT: Slide switch for selecting 70V or 100V for all zones configured for constant voltage output. The U.S. National Electrical Code prohibits the use of 100V constant voltage systems for installations in the United States. - Page 9 Bridge 8Ω terminals, the 8Ω/4Ω-70V/100V switch (6) MUST be in the OUT position and the Stereo-Bridged switch (11) MUST be in the IN (Bridged) position. 4/8Ω: Use the indicated terminals (2 and 3, 4 and 5) to connect a pair of 4-ohm or 8-ohm speakers (30W@8Ω...
- Page 10 in the OUT position and is set for Bridged operation when the switch is in the IN position. 12. VOLTAGE SELECT: Slide switch for setting the input AC voltage level to nominal 120V or 240V operation. The switch is set to the 120V position at the factory and the appropriate fuse is installed.
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Page 11: Ir Remote Control
IR Remote Control 1. Mute: Press the Mute button to turn zone audio muting on or off. 2. Source: Press the Source buttons to select Bus or Line for the zone audio source. 3. Treble: Press the Treble buttons to increase or decrease the zone treble response. -
Page 12: Sample Connection Diagram
SAMPLE CONNECTION DIAGRAM... -
Page 13: Constant Voltage Vs Low Impedance Speaker Systems
CONSTANT VOLTAGE VS LOW IMPEDANCE SPEAKER SYSTEMS A constant voltage speaker system differs from a traditional low impedance (e.g., 8-ohm) speaker system in that it uses a step-up transformer at the audio source to raise the voltage and lower the current on the transmission line. At the speaker end, a step-down transformer converts the signal back to a normal speaker level voltage. -
Page 14: Wire Gauges
speaker set to a smaller value will be quieter than the others. This allows you to compensate for the environment in which the speaker is placed. For example, a speaker placed outside would need to be louder than a speaker placed in a small room. WIRE GAUGES The following tables show the maximum speaker wire lengths using different gauge wires for both 4Ω/8Ω... -
Page 15: Line Connections
LINE CONNECTIONS Line In Each zone has its own dedicated stereo LINE IN using two RCA jacks. Use a stereo RCA audio cable (not included) to connect the LINE OUT of an audio source device (e.g., CD player, FM tuner, etc.) to the individual zone LINE IN, as shown in the diagram below. Bus Audio The amplifier also features a stereo analog BUS AUDIO IN (3), a digital S/PDIF OPTICAL IN (2),... -
Page 16: Speaker Connections
AUDIO IN (3) or a digital-to-analog converted version of the OPTICAL IN (2) signal. Use a 3.5mm to RCA or 3.5mm to 3.5mm stereo audio cable (not included) to connect BUS AUDIO OUT (4) to the line input of another audio device. SPEAKER CONNECTIONS Each of the six zones on this amplifier support three different kinds of speaker connections: passive stereo 4Ω/8Ω... -
Page 17: Bridged 8Ω Mono
Bridged 8Ω Mono Another option is to configure the zone to bridge the stereo outputs to a single monophonic audio output with approximately double the power of the stereo outputs. In this configuration, each zone only connects to a single 8-ohm speaker designed to handle up to 100 watts of power. -
Page 18: Constant Voltage 70V/100V Stereo
Constant Voltage 70V/100V Stereo The third speaker option is to use a pair of constant voltage speaker arrays. Each array can consist of almost any number of speakers. When an array uses multiple speakers, they must all be wired in parallel and the wattage settings of each must not exceed 24 watts (30 watts x 80%). -
Page 19: Trigger Connections
TRIGGER CONNECTIONS This amplifier features several trigger inputs and outputs. The trigger inputs activate when a +3 ~ +30 VDC@1mA voltage is applied, while the trigger outputs deliver ether +11.5 VDC@1mA ~ +10 VDC@5mA or +12 VDC. Each trigger output is used for activating another trigger-enabled devices, such as a motorized projection screen. -
Page 20: Master Control Out
Master Control Out The amplifier features a single Master Control Out (15), which outputs a +11.5 VDC@1mA ~ +10 VDC@5mA voltage for triggering another trigger-enabled device. The voltage is applied whenever the amplifier is powered on and delivers 0 VDC when the amplifier is powered off. -
Page 21: Rs-232 Connection
RS-232 CONNECTION Use an RS-232 serial cable (not included) to connect the amplifier to a computer or other serial control device for issuing RS-232 control commands. Pin 2 is the signal output, pin 3 is the signal input, and pin 5 is the common ground. RS-232 COMMANDS This amplifier can accept RS-232 commands from a connected PC to change settings and get status reports. -
Page 22: Rs-232 Commands
Volume Level {v#} 0 ~ 38 Volume level (see the table below). Bass/Treble Level {bt#} 0 ~ 14 Bass/Treble level (see the table below). Balance Setting {b#} 0 ~ 63 Balance setting (see the table below). RS-232 Commands Function Command Remarks Zone Power !{z#]PR{0 / 1}+... - Page 23 Turns zone muting on or off. 0 = Off, 1 Zone Audio Mute !{z#}MU{0 / 1}+ = On. Toggles zone muting from on to off or Zone Audio Mute Toggle !{z#}MT+ from off to on. Sets the zone treble level (see the Zone Treble !{z#}TR{bt#}+ Bass/Treble Level...
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Page 24: Rs-232 Queries
RS-232 Queries Function Query Response Description Zone Volume ?{z#}VO+ ?{z#}VO{v#}+ Channel Volume ?{c#}CH+ ?{c#}CH{v#}+ Zone Audio Mute ?{z#}MU+ ?{z#}MU{0 / 1}+ Zone Power ?{z#}PR+ ?{z#}PR{0 / 1}+ Zone Input Select ?{z#}IS+ ?{z#}IS{0 / 1}+ 0 = BUS, 1 = LINE. Zone Treble ?{z#}TR+ ?{z#}TR{bt#}+... -
Page 25: Volume Level
Volume Level Volume Setting Attenuation (dB) Volume Setting Attenuation (dB) -78.75 -22.50 -75.00 -21.25 -71.25 -20.00 -67.50 -18.75 -63.75 -17.50 -60.00 -16.25 -56.25 -15.00 -52.25 -13.75 -50.00 -12.50 -47.50 -11.25 -45.00 -10.00 -42.50 -8.75 -40.00 -7.50 -37.50 -6.25 -35.00 -5.00 -35.50 -3.75 -30.00... -
Page 26: Bass/Treble Level
Bass/Treble Level Setting Level (+/-dB) -
Page 27: Balance Setting
Mute TECHNICAL SUPPORT Monoprice is pleased to provide free, live, online technical support to assist 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. -
Page 28: Specifications
SPECIFICATIONS Model 31028 Number of Zones 30 watts/channel into 8 ohms@1kHz 50 watts/channel into 4 ohms@1kHz Continuous Output Power (per zone) 100 watts bridged into 8 ohms@1kHz 30 watts/channel 70V/100V@1kHz Frequency Response 20Hz ~ 20kHz ±1dB Total Harmonic Distortion 0.1%@10W... -
Page 29: Regulatory Compliance
REGULATORY COMPLIANCE Notice for FCC Modifying the equipment without Monoprice’s authorization may result in the equipment no longer complying with FCC requirements for Class B digital devices. In that event, your right to use the equipment may be limited by FCC regulations, and you may be required to correct any interference to radio or television communications at your own expense.
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