MPA-400
Wireless Megaphone P.A.
Owner’s Manual
CONTENTS
SYSTEM FEATURES
MPA-400 WIRELESS MEGAPHONE P.A.
INTRODUCTION....................................................................................2
SYSTEM FEATURES.............................................................................3
MPA-400 USER CONTROLS AND CONNECTIONS ............................4
TRANSMITTER USER CONTROLS AND CONNECTIONS .................5
SYSTEM OPERATION AND SETUP.....................................................6
STAND MOUNTING THE MPA-400.......................................................7
WIRED AND WIRELESS OPERATION.................................................8
SAFETY TIPS AND WARNINGS...........................................................9
SPECIFICATIONS................................................................................10
SERVICE INFORMATION....................................................................10
WARRANTY.........................................................................................11
• Full-range megaphone speaker system with built-in Amplifier, Mixer,
and High Band VHF Wireless Receiver
• Powerful 40W audio power output
• Wireless system features noise reduction companding circuitry for
quietest operation with a wide dynamic range
• WHT handheld Mic transmitter included. (1x MPA-400 megaphone
receiver and 1x WHT transmitter on the same frequency comprises a
system)
• 1/4” unbalanced input jack with volume and tone control for both wired
and wireless microphone
• Power/Charge/Low Battery LED Indicators
• Convenient built-in rechargeable battery
• Powered externally with 12V/3A DC power supply
• Stand mountable with optional MPA-4S stand
• Compact & lightweight- 7 x 9 x 11.5in (178 x 229 x 292mm) & 12.4 lbs
(5.6kg): easily transportable with attached shoulder strap
INTRODUCTION
Thank you for purchasing a Nady MPA-400 Wireless Portable
Megaphone P.A.—and congratulations on your choice. The megaphone
horn-type loud speaker is suitable for use in area with high ambient noise
levels. Ideal for many applications, including use in outdoor gatherings,
classrooms, conference/meeting rooms, churches, health clubs and
small auditoriums. It is powerful, yet lightweight and easily portable
with its attached shoulder strap. We are sure you will find this versatile
system a powerful and useful tool for your presentations.
WHT TRANSMITTER
The Nady WHT is a sleek tapered handheld microphone with these
special features:
• Features the Nady DM -10D unidirectional neodymium dynamic
cartridge for optimum true sound, maximum feedback rejection and
minimal handling noise
• OFF/STANDBY/ON switch allows convenient audio muting with the
transmitter “ON”
USING THIS MANUAL
• Low battery LED indicator flashes once for unit “ON”; lights steady for
This booklet provides information regarding the use of the MPA-400
wireless megaphone system. It includes detailed instructions, description
of features and step-by-step guides to operating. This should answer any
questions about the operation and servicing of this system.
low battery alert
• Operates up to 20 hours on a single 9 volt battery
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CONTROLS AND CONNECTIONS
CONTROLS AND CONNECTIONS
1. Receiver Antenna Extend fully for optimum range
2. Handle/Shoulder Strap For transporting the MPA-400
3. Handle
WHT Handheld Microphone Transmitter
4. Tone Control Counter-clockwise increases bass, clockwise
increases treble
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5. Wireless/Wired Mic Volume Control
6. Wired Mic Input 1/4” TS (mono) jack
7. 3A Fuse Protects the MPA-400 from overload
8. External 12VDC Input Terminal
9. Power ON/OFF Switch
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10. Low Battery ON LED (Red)
11. Battery Charging LED (Red)
16
12. Power ON LED (Green)
13. AC Input jack for supplied AC cord
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14. Battery Compartment (single 9v alkaline)
15. Power ON/MUTE/OFF Switch
16. Power/Low Battery LED Flashes once for unit on, lights steady for
low-battery alert
17. Mic Input Nady DM-10D element
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4
2
POWER
POWER
CHARGING
LOW
BATTERY
5
6
9
MIC/WIRELESS
MIC IN
TONE
10
Wireless Portable
Megaphone
MPA-400
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12
BATTERY
FUSE 3A/250V
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8
AC~110V–230V
frq. 50Hz/60Hz
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4
5
SYSTEM OPERATION AND SETUP
Powering the MPA-400
WIRED AND WIRELESS OPERATION
WIRED OPERATION
The front panel has 1x ¼” input jack for connecting a wired microphone.
Doing so will disconnect the wireless microphone audio and allow wired
microphone use only.
Turn on the unit using the Power ON Switch (9). The Power ON LED
(12) indicating the MPA-400 is receiving power. The MPA-400 is powered
internally by the 12V/3.3A rechargeable battery. A fully charged battery
can power the unit for up to 2 hours of normal operation. The unit will
start charging the internal battery automatically when on; or when the
internal rechargeable battery is low. When charging, the Charging ON
LED (11) will remain lit.
• Plug wired microphone into ¼” input (MIC IN) with XLR-1/4” cable
• Make any necessary adjustments to Mic level and Tone
• “MIC/WIRELESS” adjusts the input sensitivity.
(Note: To avoid damaging your unit, use only the provided AC cord
connected to the power input socket.)
NOTE: The gain knob can be used to avoid distortion and feedback. It is
best to begin with the gain lower and increase as needed.
• “TONE” adjusts the bass and treble. Top center produces flat operation
(no EQ).
-Turning the knob to the right increases the treble and reduces the bass.
-Turning the knob to the left increases the bass level and reduces the treble.
When the Low Battery ON LED (10) is on, this means the MPA-400
needs to be charged as soon as possible. When charging, the LED
remains red. When charging is complete, the LED turns Green. For op-
timum use, the MPA-400 should be fully charged each time. Disconnect
the AC cord when charging is complete.
(Note: Do not turn off the MPA-400 Power ON Switch until the Battery
charging LED ON indicator lights green, the battery is fully charged and
ready to power the MPA-400 alone. Shut off the Power ON Switch and
disconnect the AC cord. If the unit is not to be used for a long period of
time, make sure the battery is fully charged before put it away for next
use.)
• If feedback occurs, first try turning down the Tone control (4) to MIN.
If feedback still is present, try turning down the Wire/Wireless Mic
Volume Control (5) or repositioning the MPA-400 with respect to the
wired or wireless Mic being used.
Note: Microphone elements can easily be destroyed by the buildup of
salts and minerals from perspiration and saliva. It is good practice to
place a windscreen on the mic at all times.
(Note: When the Charge ON LED is not turns Green or the operating
hours is noted less, the internal battery might need replacing.)
WIRELESS OPERATION
External Power for Charger
Plug the external provided power cord into AC Input Socket (13).
Then plug the AC plug into a standard 115VAC or 240VAC outlet
(The AC adapter will detect the Line Voltage Automatically).
• Unscrew the battery compartment cover end cap (14) and remove,
exposing the battery compartment. Insert a fresh 9V alkaline battery,
observing polarity. Replace the battery cover.
• Turn on the microphone power switch (15) on the handle of the
microphone. The battery indicator LED (16) will give a single quick
flash, indicating usable battery strength. In the case of a dead or
low battery, the indicator will either not go on at all or will stay on
continuously, indicating a need to replace the battery. To preserve
battery life, turn the transmitter off when not in use.
• If there is no audio, check that the Power Switch (15) is not on
MUTE/Standby - second position.
• Adjust the volume of the MPA-400 to the desired level.
• Extend the Wireless Mic Receiver Antenna (1) fully whenever using
the wireless microphone to ensure optimum performance and maximum
range.
External 12V DC Supply
The MPA-400 can be powered externally supply via the External DC
+12V DC Input Terminal (8). Connect the external power supply wires
to the two input terminals, observing the correct polarity as marked. The
power source should provide 12VDC at current 3A or higher. The 3A
Fuse (7) is used to protect power the unit overloading. Should the fuse
burn, replace with the same type SB (Slow-Blow).
(Note: External 12V DC Supply will not charge the internal rechargeable
battery.)
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SYSTEM OPERATION AND SETUP
Note: If using more than one wireless microphone on the same frequency,
switch only one on at a time. Microphones on the same frequency will
interfere with each other. However, one wireless microphone can be used
with two or more MPA-400 wireless receivers on the same frequency
simultaneously to increase overall sound level.
Observe care in selecting volume, transmitter location and speaker
placement so that acoustic feedback (howling and screeching) will be
avoided. Mics that are farther from the sound source require more acoustic
gain and thus are also more prone to feedback than close-source mics.
Stand Mounting the MPA-400
The MPA-400 can be mounted to the MPA-4S optional aluminum tripod
stand for convenient placement in a higher position.
Contact your dealer or the Nady service department. (See Page #10)
STAND INSTALLATION (MPA-4S)
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One Year Limited Warranty
SPECIFICATIONS
Nady Systems, Inc. warrants to the original consumer purchaser that the unit is free from any defects
in material or workmanship for a period of one year from the date of original retail purchase. If any such
defect is discovered within the warranty period, Nady Systems, Inc. will repair or replace the unit free of
charge, subject to verification of the defect or malfunction upon return to Nady Systems. Please do not
return your Nady product to the store where it was purchased as Nady Systems handles your warranty
service directly. Communication with our Service Department is the most efficient means of servicing
your unit and we are dedicated to keeping you a satisfied customer.
Audio Power Output:
Internal Battery:
External Power:
Built-In Charger:
AC Power consumption:
Dimension:
40W maximum, 6 Ohms
Built-In 12V/3.3A (Rechargeable Battery)
12VDC 3A DC Supply
100~240VAC/50~60Hz
40 VA
7” x 9” x 11.5” (178 x 229 x 292mm) and
12.4 lbs. (5.63 Kg.)
52dB +/-2dB
To the extent permitted by law, any applicable implied warranties, including warranties of merchantability
and fitness are hereby limited to one year from the date of purchase. Consequential or incidental
damages resulting from a breach of any applicable express or implied warranties are hereby excluded.
This warranty is in lieu of all other agreements and warranties, general or special, express or implied
and no representative or person including a Nady dealer, agent, or employee is authorized to assume
for us any other liability in connection with the sale or use of this Nady Systems’ product.
Weight:
Input Sensitivity
Frequency Response:
T.H.D.:
150-15KHz +/-3dB
1% @400Hz
Inputs:
Tone Control Range:
Wireless Mic, Hardwired Mic Inputs
Hi: +/-6dB at 10KHz
Low: +/-6dB at 100Hz
Whereas some states do not allow limitations on how long implied warranties last, and do not allow
exclusion of incidental or consequential damages, the above limitations and exclusions may not apply
to you. This warranty gives you specific legal rights and you may also have other rights which may vary
from state to state.
Wireless Operating
Frequency Range:
Battery/Hours
This warranty is subject to the following conditions:
170-216MHz, FM (3E)
9V/ 8Hours
1) This system must have been purchased from an authorized Nady dealer and all warranty
service must be performed by Nady’s service department. Any service not performed by Nady
will automatically void this warranty.
Wireless Operating Distance: 100 ft. typical, up to 200 ft. line of sight
2) Items not covered: physical damage resulting from improper handling of the unit in transit from the
factory by the shipper (Nady Systems is not responsible for such damage and all such claims must be
made against the shipping company by the consignee); defects caused by normal wear of the product
(expendable parts are typically connectors, cables, potentiometers, switches and similar components);
damage or defects caused by abuse, neglect, accident, failure to connect or operate the unit in any way
that does not comply with applicable technical or safety regulations, or improper repair, excessive heat
or humidity, alteration or unreasonable use of the unit, causing cracks, broken cases/housings or parts;
damage caused by leaking batteries; finish or appearance items; items damaged in shipment en route to
Nady Systems, Inc. for repair. The warranty is null and void if any Nady serial number has been removed
or defaced.
SERVICE
(U.S.) Should your Nady MPA-400 require service, please contact
the Nady Service Department via phone at (510) 652-2411 or e-mail
service quote (if out of warranty). Make sure the (R/A) number is clearly
marked on the outside of the package, cashier’s check or money order is
enclosed (if not prepaid with a credit card), Include a brief description of
the problems you are having and ship the unit prepaid to:
Nady Systems Inc.
How To Obtain Service:
1) If factory service is required, you must contact our Service Department at (510) 652-2411 for a return
authorization (RA) number. Make sure the RA number is clearly marked on the outside of your package.
(Please note: if an RA number is not included, our shipping department cannot accept your package.)
2) Send the unit back to Nady Systems, 6701 Shellmound Street, Emeryville, CA, 94608 freight
pre-paid. You must include proof of date and place of purchase (i.e., photocopy of your bill of sale) and
a brief description of the unit’s problem(s) or Nady cannot be responsible for repair or replacement.
Nady Systems, Inc. will not repair, nor be held responsible, for any units returned without proper
identification, return address, and RA number clearly marked on the package.
3) Per the above, Nady will perform all warranty service and return the unit to you at no charge.
Nady Systems will inform the buyer if product sent in does not meet the terms of this warranty
and will provide a quote for fixing the unit and/or shipping it back exclusively at the buyer’s expense.
Service Department,
6701 Shellmound Street
Emeryville, CA 94608
Consumer Alert
(International) For service, please contact the Nady distributor in your
Most users do not need a license to operate this wireless microphone system. Nevertheless, operating
this microphone system without a license is subject to certain restrictions: the system may not cause
harmful interference; it must operate at a low power level (not in excess of 50mW); and it has no
protection from interference received from any other device. Purchasers should also be aware that the
country through the dealer from whom you purchased this product.
DO NOT ATTEMPT TO SERVICE THIS UNIT YOURSELF AS IT CAN
BE DANGEROUS AND ALSO VOID THE WARRANTY
FCC is currently evaluating use of wireless microphone systems, and these rules are subject to change.
For more information, call the FCC at 1-888-CALL-FCC (TTY: 1-888-TELL-FCC)
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