MIPRO ACT-72
Contents
1. GND HoT coD O Figure 1 J 1 Antenna Installation Install 2 separate antennas on the antenna sockets coe on the rear panel Illustrated in Figure 1 Figure 2 Figure 3 2 AC Power Operation Connect the AC power cable to the AC Input Jack then plug the other end into an AC outlet having the correct voltage and rating as shown in Figure 1 e Electric Guitar Output Using audio output cable with 1 4 phone plug type connectors plug one end into the unbalanced output jack of a receiver ACT 71 only and the other end into the input jack of a guitar amplifier Switch the Level Switch to 16dB position the switch will show 16dB on the receiver but actually puts out 10dB on the unbalanced jack uw 3 Audio Output Connection e Level Switch Setting Position When connecting from the receiver s unbalanced 1 4 output ACT 71 only to the LINE IN jack of a mixer or an electric guitar amplifier switch the Level Switch to the 16dB position Low sensitivity may occur if switched to the wrong level position therefore don t use the OdB or 6dB positions as they may not deliver a sufficiently high level of input When connecting from a receiver s balanced output to the MIC IN jack of a mixer switch the Level Switch to the OdB position Overloa2. Antenna A Front Mount Allows an optional FBC 71 rear to front antenna cable for front antenna placement Power Switch and Indicator When the switch is turned on the red indicator illuminates to denote normal power status Receiver Display Color VFDs Rotary Controller To set up parameters Move cursors by turning the control clockwise or counterclockwise 60 9 6 Antenna B Front Mount Allows an optional FBC 71 rear to front antenna cable for front antenna placement Rear Panel ACT 71 Single Channel True Diversity Receiver O 8 Rear Antenna B Input Connector The B antenna can be installed directly to this antenna connector which also provides power to an optional antenna booster Ventilation Fan Ensures stable performance in long hours of operation under high temperature environments Level Switch OdB selection is for Microphone level output 16dB selection is for LINE level output 6dB selection is for half of cable microphone volume Mixed AF Output Jack A balanced output jack for mixed AF signals from all installed channels 3 output levels to choose from Balanced Audio Output Jack XLR type connector provides balanced audio output signal from this jack to the mixer and output level is selectable from among 3 levels 6dB OdB and 16dB 666 6 8 Unbalanced Audio Output Jack
3. GRP GROUP setting Hb 1 Did GOS GRP cH Fra NAME ADD CHANNEL SET e Turn knob clockwise to increase values e Turn knob counterclockwise to decrease values GRP Cursor Instructions 1 13 Press and release the button once The SET it is ready to accept parameter changes Turn Rotary Controller left or right and stop at ERA Press and release the Rotary Controller once and current eR number starts flashing Turn Rotary Controller left or right to increase or decrease RARA numbers Press and release the Rotary Controller once to confirm the change The ERG number stops flashing To confirm and save the new parameter press and release the button once The set cursor stops flashing and the new GRP number is now stored into memory cursor starts flashing to denote CHANNEL setting Pee snes pid GOJ cre CH FRA NAME ADD CHANNEL SET CH Cursor e Turn knob clockwise to auto scan from beginning to the end of frequency band e Turn knob counterclockwise to auto scan from end to the beginning of frequency band Instructions 1 To confirm and save the new parameter press and release the SET Press and release the button once The denote it is ready to accept parameter changes cursor starts flashing to Turn Rotary Controller left or right and stop at Press and release the Rotary Controller once and current number starts fl
4. 14 PHONE PLUG type connector provides unbalanced audio output signal from this jack to the mixer ACT 71 only Output level is selectable from among 3 levels 6dB OdB and 10dB the switch will show 16dB on the receiver but actually puts out 10dB on the unbalanced jack Network Interface Connector For linking the receivers to a computer system monitoring program Rear Antenna A Input Connector The A antenna can be installed directly to this antenna connector which also provides power to an optional antenna booster AC Power Socket The input socket for AC power ranging from 100VAC 240VAC Rack Mount Brackets To install the receiver into a standard EIA 19 inch rack case LIFT GND Switch Lifts ground from Pin 1 of the XLR connector GND default RECEIVER INSTALLATION Unbalanced Output Using an audio output cable with 4 PHONE PLUG type connectors connect one end from the unbalanced output jack of the receiver and the other end to the LINE IN input jack of the mixer or guitar amplifier as shown in Figure 2 ACT 71 only Balanced Output Using audio output cables with XLR or Cannon type m KN a 9 mo oe connectors connect one end to the balanced output jacks of the receiver and NS A the other end to the MIC IN input jack of the mixer or amplifier as shown in 7 Figure 1 The configuration of the 3 pin connector is as shown in Figure 3
5. Press amp release the button again while the SET cursor is flashing to confirm and save 4 To Lock or Unlock 2 3 Channels ACT 74 Follow the same procedure as above using the button on each channel to set the lock status as desired Note This is easier if you keep an eye on the unset channels icons as they flash on and off 19 Setting ACT transmitter frequency sd oP on FRG Name ADD CHANNEL SET X eae Press ACT button Instructions 1 Press the button once to activate the syncing function The word ALT appears immediately on the receiver screen 2 Turn the transmitter s power on and bring handheld or bodypack transmitter within 30cm 12 of the IR port on the receiver The IR port is located between the and buttons The frequency will sync automatically 3 When the sync is done successfully the word ALT will disappear from the receiver screen and the transmitter LCD will show the group amp channel 4 The word A LOSE will appear on the receiver screen after 10 seconds if the syncing was unsuccessful To start the ACT syncing again press the button again IE CHANNEL 20 BA Transmitter Battery Meter TA 100 90 80 40 10 0 The battery meter is lit when the transmitter is powered on The LCD battery meter gives a indication of remaining battery life as shown above Replace with new fresh batteries when battery indicators fall to 10 1 lev
6. The antenna inputs provide 8 volt DC biased and are designed to work with MIPRO antenna boosters If the connecting cable is longer than 10 meters approx 30 it is advisable to install an antenna booster to ensure optimal reception Antenna dividers and receivers must be from the same frequency band RACKMOUNT INSTALLATION FOR RECEIVERS Single half rack receiver Install provided rack mount kit and fasten with screws on both sides Figure 4 Figure 4 Dual half rack receivers Unfasten the top and bottom screws for each receiver Push the receivers next to each other Place holding plates on top and bottom of the two receivers first and following the directions slide both plates into position over the screw holes Then tighten screws screws should be used in their original location i e top screws for top holding plate and bottom screws for bottom holding plate After both receivers are fixed together fasten the rack mount kit on both sides of the joined receivers as shown in Figure 5 Figure 5 Receiver Rack Mount Kits FB 71 OD FB 72 Y Dy Z Mounts 2 half racks in a single rack space g Mounts 1 half rack in a single rack space e The rack mountable kits are pre drilled with 4 opening holes to be fitted on an EIA standard 19 inch rack case Figure 6 e For ideal reception and performance install the receiver at least 1 meter 3 feet above the ground and away from EMI RFI nois
7. exit from the apparatus Only use attachments accessories specified by the manufacturer Use only with a cart stand tripod bracket or table specified by the manufacturer or sold with the apparatus When a cart is used use caution when moving the cart apparatus combination to avoid injury from tip over wie Unplug this apparatus during lightning storms or when unused for long periods of time Refer all servicing to qualified service personnel Servicing is required when the apparatus has been damaged in any way such as power supply cord or plug is damaged liquid has been spilled or objects have fallen into the apparatus the apparatus has been exposed to rain or moisture does not operate normally or has been dropped To reduce the risk of fire or electric shock do not expose this apparatus to rain or moisture Apparatus should not be exposed to dripping or splashing and no objects filled with liquids should be placed on the apparatus Use only with the battery which specified by manufacturer The power supply cord set is to be the mains disconnected device WARNING 1 FOR OUTDOOR USE To reduce the risk of fire or electric shock do not expose this apparatus to rain or moisture 2 UNDER WET LOCATION Apparatus should not be exposed to dripping or splashing and no objects filled with liquids such as vases should be placed on the apparatus 3 SERVICE INSTRUCTIONS CAUTION These servicing instructions are for us
8. A MIPRO User Guide ACT 71 ACT 72 ACT 74 Wideband True Diversity Receiver m wW MIPRO Electronics Co Ltd Headquarters 814 Pei Kang Road Chiayi 60096 Taiwan Tel 886 5 238 0809 Fax 886 5 238 0803 MICROPHONE PROFESSIONALS www mipro com tw mipro mipro com tw ce Fe Ul All rights reserved Do not copy or forward without prior approvals MIPRO Specifications and design subject to change without notice MN 014 07 CE467B pe ON ae eo oe 10 11 12 13 14 15 16 17 18 IMPORTANT SAFETY INSTRUCTIONS Read these instructions Keep these instructions Heed all warnings Follow all instructions Do not use this apparatus near water Clean only with a dry cloth Do not block any ventilation openings Install in accordance with the manufacturer s instructions Do not install near any heat sources such as radiators heat registers stoves or other apparatus including amplifiers that produce heat Do not defeat the safety purpose of the polarised or ground plug A polarised plug has two blades with one wider than the other The wide blade is provided for your safety When the provided plug does not fit into your outlet consult an electrician for replacement of the obsolete outlet Protect the power cord from being walked on or pinched particularly at plug convenience receptacles and the point where they
9. UE DIVERSITY RECEIVERS 1 Product Overview 2 MIPRO S Proprietary ACT Function amp Operation 3 Part Names and Functions 6 Receiver Installation 8 Receiver Operation Tips 9 Rackmount Installation for Receivers 11 Receiver VFD Interface 22 Computer Network Interface Operation 23 General Tips for Improving System Performance 24 Troubleshooting PRODUCT OVERVIEW The ACT 71 ACT 72 ACT 74 receivers feature a full color Vacuum Fluorescent Display VFD which delivers a very bright light with exceptionally clear contrast The VFD has a wide viewing angle and can be viewed clearly in both indoor and outdoor environments Since it displays all pertinent parameters on the same screen audio professionals can clearly monitor group channel frequency name RF amp audio signal strength diversity condition transmitter battery level squelch level and indication of interference at a glance True diversity technology ensures exceptionally long range for greatest RF reliability and freedom of movement while the industry s first AutoScan amp Automatic Channel Targeting ACT channel set up technology and dual squelch PiloTone amp NoiseLock circuits minimize interference ACCESSORIES The following accessories are included Antenna x 2 User Guide x 1 AC Power Cord x 1 Phone Cable x 1 Audio Output Cable x 1 ACT 71 Y MIPRO S PROPRIETARY ACT FUNCTION amp OPERATION What is ACT ACT stands for Automatic Chan
10. anged the character stops flashing To confirm and save the new parameter press and release the button once The ser cursor stops flashing and the new NAME is now stored into memory 16 ADDRESS setting ADD Cursor ee CHANNEL SET e Turn knob clockwise to increase values e Turn knob counterclockwise to decrease values Instructions 1 17 Press and release the button once The set cursor starts flashing to denote it is ready to accept parameter changes Up to 64 receiver channels can be remotely monitored and controlled by MIPRO proprietary software and hardware via its ACT BUS computer interface Address numbers need to be pre programmed in advance from 01 64 before interfacing for network monitoring and control However to ensure networking is working properly all address numbers need to be different from each other to avoid address conflicts Note The same address number can be repeated for different receiver channels IF a computer is not being used to control monitor the systems Turn Rotary Controller left or right and stop at EOJ Press and release the Rotary Controller once and the current number starts flashing Turn Rotary Controller left or right to increase or decrease numbers Press and release the Rotary Controller once to confirm the change The EOI number stops flashing To confirm and save the new parameter press and release the button o
11. ashing Turn Rotary Controller left or right to increase or decrease numbers If there is interference on your chosen CH it will automatically jump to the next interference free CH Press and release the Rotary Controller once to confirm the change The number stops flashing button once The set cursor stops flashing and the new number is now stored into memory 14 GY FREQUENCY setting Mme MILI Pad GAJ GRP cH ERa wane ADD C CHANNEL ACT FRQ Cursor Turn knob clockwise to increase frequency e Turn knob counterclockwise to decrease frequency Instructions 1 15 To confirm and save the new parameter press and release the Groups 16 contains 2 881 user defined frequencies Up to 16 frequencies can be selected and stored Press and release the button once The denote it is ready to accept parameter changes SET cursor starts flashing to Turn Rotary Controller left or right and stop at Iie Press and release the Rotary Controller once and the current ey number starts flashing Turn Rotary Controller left or right to increase or decrease BERA numbers in increments of 1MHz first 3 digits of the frequency Press and release the Rotary Controller again to confirm the first 3 digits then turn left or right to adjust the last 3 digits of the ERAN number in increments of 25 KHz Press and release the Rotary Controller once more to confirm the chang
12. d distortion may occur if switched to the wrong level position There are many different amplifiers for Karaoke machines in today s market however the gain of many of these amplifier s MIC IN is not consistent Therefore if distortion is encountered please switch the Level Switch to the 6dB position Mixed Output Balanced output socket XLR must connect to the balanced input socket of the mixer This output socket generates the mixed output of Ch 1 Ch 4 and the output sensitivity can be adjusted to 16dB or OdB or 6dB by the level switch on the right side of the socket ACT 72 ACT 74 RECEIVER OPERATING TIPS Prior to powering on the receiver ensure all transmitters are turned off and the mixer s volume control is set to a minimized setting Red LED power indicator is lit when powered on Normally the RF meter level glows when a transmitter is powered on to indicate the receiver is ready for operation Once an audio signal is received from the transmitter the AF meter level glows based on signal strength If the meter or indicator does not glow or there is no audio output the system may not be set up properly Re check that the transmitter is turned on and the receiver and transmitter are on the same frequency if not the transmitter will need to be reset via the ACT function The microphone output level needs to be adjusted at the mixer There is no need to adjust output levels at the receiver itself
13. e sources In addition place the transmitter microphone at least 1 meter 3 feet away from the receiving antenna as shown Figure 7 Figure 6 Figure 7 Ground e Please note the main disconnected device is the AC Inlet e L Shaped steel bracket size for rack mounted function e The screw size for rack mounted function is as below 10 00mm Total 4 screws provided E E rm S amp x RECEIVER VFD INTERFACE Displays all Parameters Audio Signal Meter Channel can be programmed Diversity A B Antenna Working Frequency RF Signal Meter Interference Indicator lit denotes presence of interference Frequency can be programmed 8 Battery Meter Squelch Meter levels can be programmed 10 PC Address can be programmed Name can be programmed Setting Cursor Group can be programmed O Lock Icon can be turned on or off Display Panel and Buttons PE i i CHANNEL ACT SET 11 Receiver Parameters Rotary Control Knob To set parameter values 6 parameters can be selected and programmed See instructions below E Programmable Parameters NOTE To confirm a parameter change and save it into the system you must press the button to end the flashing of the sET cursor If this step is missing the new parameter is not saved and will not be stored in the system when powered off 12
14. e The EA number stops flashing button once The SET cursor stops flashing and the new BERA number is now stored into memory If the new frequency is not one of the preset channels for that Group the display will show asterisks in place of the Group and Channel designations NOTE If a new frequency is selected that is not among the preset channels for the chosen Group it MAY not be compatible with the other channels within that Group and may potentially cause interference If this occurs the frequency will need to be changed to avoid problems The preset channels within each Group are specifically selected to work together when using multiple systems simultaneously MAW NAME setting NAME Cursor cies CHANNEL SET e Turn knob clockwise to increase letters values and symbols e Turn knob counterclockwise to decrease letters values and symbols Instructions 1 Turn Rotary Controller left or right and stop at f Press and release the button once The set cursor starts flashing to denote it is ready to accept parameter changes Press and release the Rotary Controller once and the current MNH alphanumeric characters start flashing Turn Rotary Controller left or right for alphanumeric characters like numbers letters and signs A total of 6 alphanumeric characters can be changed Turn and press the Rotary Controller once to confirm each character change Once all 6 characters are ch
15. e by qualified service personnel only To reduce the risk of electric shock do not perform any servicing other than that contained in the operating instructions unless you are qualified to do so CAUTION RISK OF ELECTRIC SHOCK DO NOT OPEN This symbol indicates that dangerous voltage constituting a risk of electric shock is present within this unit This symbol indicates that there are important operating and maintenance instructions in the literature accompanying this unit FE amp IC ID THIS DEVICE COMPLIES WITH PART 15 OF THE FCC RULES AND RSS 123 ISSUE2 OF CANADA OPERATION IS SUBJECT TO THE FOLLOWING TWO CONDITIONS 1 This device may not cause interference 2 This device must accept any interference including interference that may cause undesired operation of the device This equipment complies with FCC RF radiation exposure limits set forth for an uncontrolled environment Disposal Dispose of any unusable devices or batteries responsibly and in accordance with any applicable regulations Disposing of used batteries with domestic waste is to be avoided Batteries NiCad cells often contain heavy metals such as cadmium Cd mercury Hg and lead Pb that makes them unsuitable for disposal with domestic waste You may return spent batteries accumulators free of charge to recycling centres or anywhere else batteries accumulators are s id By doing so you contribute to the conservation of our environment TR
16. el remaining 21 COMPUTER NETWORK INTERFACE OPERATION 1 MIPRO ACT receivers have an advanced computer network interfaced controlling system 2 Wiring Instructions e The network interface of ACT 71 ACT 72 ACT 74 receivers is the REMOTE connector that can be linked to a computer by a MIPRO DVU or MIPRO DVJ hardware device By using a RS 232 or USB connector you can link to a computer through the RS 232 COM PORT or USB PORT See diagram below Connect to keyboard jack on PC Connect to RS 232 jack on PC PC t Connector of keyboard MIPRO DVJ should plug in here OR Sw asec USB MIPRO DVU 3 E sisi RX1 29 J F A gt COU i z z 9 ore arao _9 RX2 ne HO YO QADI p_ C z e z Rean O ns doi Q gt p e Plug one side of the provided cable w RJ 11 connectors to the REMOTE OUT socket on the rear of the receiver and the other end of the phone cable to the REMOTE IN socket on the rear of the second receiver Repeat this connection for each receiver in the system as per the illustration Finally connect the REMOTE IN socket on the rear of the first receiver to the MIPRO DVU or MIPRO DVJ e This system can link monitor and control up to 64 receiver channels simultaneously e The connecti
17. er Lock Press and hold the Rotary Controller until the icon appears Release the Rotary Controller immediately when the A icon appears When locked the receiver parameters can no longer be changed However you can still navigate the Rotary Control Knob to view existing settings and parameters 2 Unlock Receiver Press and hold the Rotary Controller until the icon disappears Release the Rotary Controller immediately when the icon disappears ACT 72 amp ACT 74 Receivers 1 To Lock or Unlock All Receiver Channels Same instructions as ACT 71 receiver See 1 above 2 To Lock 1 Receiver Channel only For example locking Channel 1 Press amp hold Rotary Controller until all A icons start flashing Press amp hold the button on Channel 1 when the fq icon appears then release the Rotary Controller and button of Channel 1 simultaneously when the rest of the f icons in the other channels disappear Press amp release the button again while the ser cursor is flashing to confirm and save 3 To Unlock 1 Receiver Channel only For example unlocking Channel 1 Press amp hold Rotary Controller until all A icons start flashing Press amp hold the button on Channel 1 until the icon disappears then release the Rotary Controller and button of Channel 1 simultaneously when the rest of the A icons in the other channels appear
18. m installations a MIPRO AD 707 AD 707a UHF antenna divider system is recommended Each AD 707 AD 707a supports up to four UHF diversity receivers to operate from a single pair of antennas When combined with an AT 70A omnidirectional extension antenna and an AT 70B antenna booster or an AT 90W directional antenna the AD 707 AD 707a antenna divider provides optimal signal reception with minimal dropouts or interference 8 Preset non interfering channels within the same channel group are recommended to ensure optimum performance from multiple wireless systems installed in the same venue Use of preset non interfering channels from different channel groups may cause interference thus is not recommended 23 TROUBLESHOOTING Symptom Solutions RF Interference Press AutoScan button to locate a clear interference free channel e Use preset compatible channels in the same group when operating multiple systems e Place receivers away or remove the sources of RF interference like solid metal objects electronic equipment amp digital devices dimmers effect equipment motors e Avoid operating a frequency on a local TV channel e A higher squelch setting improves protection against interference however resulting in limited range e Turn off one transmitter if both transmitters are operating on the same frequency e Fresh batteries in transmitter Feedback e Turn down the sound system volume e Move micro
19. nce The set cursor stops flashing and the new address is now stored into memory SQ SQUELCH setting SQ Cursor SET GRP CH FRQ name ADD XJ CHANNEL e Turn knob clockwise to increase one segment at a time e Turn knob counterclockwise to decrease one segment at a time Instructions 1 Press and release the button once The denote it is ready to accept parameter changes SET cursor starts flashing to Turn Rotary Controller left or right and stop at IEN Press and release the Rotary Controller once and current ER setting starts flashing Turn Rotary Controller left to decrease sensitivity level by 1 indicator or turn right to increase sensitivity level by 1 indicator The higher the level indicators the lower the sensitivity which shortens the transmission ranges The lower the level indicators the higher the sensitivity which increases the transmission ranges Press and release the Rotary Controller once to confirm the change The ell number stops flashing To confirm and save the new parameter press and release the button once The ser cursor stops flashing and the new SQ level is now stored into memory 18 A Receiver Lock amp Unlock Lock cursor LINIE SPEER Pia GOS GRP CH ERO ane app Ei CHANNEL ACT SET RSE Press and hold knob to lock and unlock the display panel Instructions ACT 71 Receiver 1 Receiv
20. nel Targeting MIPRO was the first manufacturer in the industry to use infrared IR technology to automatically synchronize the frequency selected on the receiver to any ACT handheld or bodypack transmitter on the same frequency band ACT Features No manual frequency adjusting needed unlike traditional transmitters Simple fast and precise frequency set up without mechanical errors Once the frequency has been set the data is stored in memory meaning that the frequency is set until it is changed by performing the ACT function again even after powering off ACT Set Up Ensure a receiver channel is set up Press and release the ACT button to activate the ACT function Once activated the word ACT appears Turn the transmitter s power on and locate the transmitter infrared IR port and bring it within 30cm 12 of the receiver s ACT port The receiver s IR port is a round window located between the ACT amp SET buttons The transmitter IR port is normally indicated by a round red colored spot When the frequencies are synchronized successfully between the transmitter and receiver the word ACT disappears and the original group and channel reappears SEEE LGRP CH FRO JNAME ADD CHANNEL PART NAMES AND FUNCTIONS Front Panel ACT 71 Single Channel ae Diversity Receiver MiPRO Bggses coog Uk 18000 emer Eaciomd j
21. ng cable to the computer can be up to 300 meters 330 yards in length however signal stability decreases the longer the cable distance Therefore the cable length is recommended not to exceed 100m 110 yards to maintain the highest quality as well as a high speed of transmission GENERAL TIPS FOR IMPROVING SYSTEM PERFORMANCE 1 Since the installation of the antenna influences the operating efficiency of the receiver the most important rule is to minimize the distance as much as possible between the receiving antenna and the microphone for the best reception and performance Use MIPRO supplied antennas to ensure proper receiver sensitivity A built in worldwide approved switching power supply assures stable performance in the range of 100 240V AC power input 4 Please note the main disconnected device is the AC Inlet ACT 71 ACT 72 ACT 74 5 The antenna socket provides an 8V DC biased output Therefore shorting on the antenna socket should be avoided Temporary shorting on the antenna socket will not affect system performance however continuous shorting on the antenna socket will cause permanent system damage 6 If extended reception distance is needed installing a MIPRO directional antenna kit AT 90W will increase the reception distance 7 Proper antenna distribution is vital to achieving ideal performance from multiple wireless systems operating in the same environment To greatly reduce antenna clutter in multi syste
22. phone closer to the performer s mouth e Reduce transmitter gain if set too high e Position microphone further away from the speakers Do not point towards speakers e Use right type of microphone for the specific applications Uni Omni Supercardioid Cardioid e Power off all unused microphones Symptom Solutions No Sound e Power on receiver amp transmitter e Receiver is plugged into a power outlet and cable connected to mixer amplifier e Fresh batteries in transmitter and inserted with correct polarity e Match receiver amp transmitter frequency Signal Drop outs e Close proximity between the transmitter and receiver antenna e Line of sight path between the transmitter and receiver antenna e Reposition the receiver and or receiver antennas e Receiver antennas are connected e Elevate receiver antennas as high as possible e Keep hands off of the transmitter antenna Limited Range e Close proximity between the transmitter and receiver antenna e Adjust antenna orientation e Reposition the receiver and or receiver antennas e Receiver antennas are connected e Undamaged antennas e Fresh batteries in transmitter e Adjust for proper squelch level setting No RF Signal e Match receiver amp transmitter frequency e Adjust for proper squelch level setting Distortion e Reduce transmitter gain if set too high e Recommendation set to 0dB Mic Level e Reduce receiver output setting e Proper setting on mixer input gain or integrated amplifie
23. r mic level control e Fresh batteries in transmitter 24 25
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