FCC ID: 2AXMO-ALFUB MIXER AMPLIFIER

ALF-250W-UB Mini Mixer Amplifier User Manual Safety Precautions 1. Safety Precautions the following requirements:

Warning! To reduce the risk of electric shock or equipment damage, please follow Please do NOT connect this device to the power source, before the system is correctly connected. It is important to ensure that input voltage to the device is the same as required voltage of the device;

otherwise the device may be damaged. There is dangerous voltage in the device, which may cause personal electric shock. Please do NOT open the case without permission, to avoid potential risks of electric shock. The device is not completely disconnected from power source when it is switched "OFF". For sake of safety, please disconnect the device from the socket if it is not in use. Please do NOT place the device where it is extremely cold or hot. Good ventilation must be provided in the working environment of the device, to avoid excessive temperature during its operation, which may cause damages to the device. Please unplug the device from power socket in raining and wet days or if it is not in use for a long time. Please disconnect the power plug from sockets, to ensure the device has been completely disconnected from power source, before any component is removed from or re-installed in the device or before any electric connector of the device is disconnected or reconnected. In case of any failure of the device, please do NOT open the case and repair without permission from a professional personnel, to avoid accident or additional damages to the device. Please do NOT place any corrosive chemicals near or on the device. Please note the following symbols:

The lightning triangular symbol is used to alert the user to the risk of electric shock. The exclamation point triangle symbol is used to alert the user to important operational or maintenance instructions. 1 CONTENT Introduction ............................................................................................................................................... 1 Product Overview ..................................................................................................................................... 1 Product Features ................................................................................................................................. 1 Front Panel .......................................................................................................................................... 1 Rear Panel .......................................................................................................................................... 3 Operating Instructions ......................................................................................................................... 4 Remote Controller ............................................................................................................................... 4 Specification ............................................................................................................................................. 5 Packing List .............................................................................................................................................. 5 Introduction installation. Product Overview volume control. Front Panel 1 Thanks for using our products. All our products are tested strictly before leaving the factory, with guaranteed quality. Our products are widely used in such places as schools, gymnasiums, square halls, parks, parking lots, railway stations, airports, villa communities and mall supermarkets, etc., and they will be your ideal choice for public address system. For better installation, commissioning and use of the product, please read this manual in detail before Product Features Built-in Bluetooth, radio and USB function. 2 MIC IN, 2 EMC IN, 2 LINE IN, 1 LINE OUT. 100V or 70V constant voltage output, 4~16 constant resistance output. Support IR remote control. With priority function, priority is EMC/MIC1>AUX1/AUX2/MIC2. With master volume control, and individual volume control of MIC & LINE, as well as treble and bass Adjust the volume of MIC1, turn clockwise to turn up the volume, and turn counterclockwise to turn 1. Display Screen 2. USB Interface 3. Play/Pause pause / play. automatically. Insert a USB to provide programs to built-in MP3. down the volume. 9. MIC2/AUX2 VOL. In USB and Bluetooth mode, press this button to Adjust the volume of MIC2/AUX2, turn clockwise to turn up the volume, and turn counterclockwise In FM mode, press this button to search the radio to turn down the volume. 10. AUX1 VOL. 4. Last Song/ (Last Radio in FM) Adjust the volume of AUX1, turn clockwise to turn In USB/Bluetooth mode, press this button to up the volume, and turn counterclockwise to turn switch to the Last Song. down the volume. In FM mode, press this button to switch to the 11. BASS VOL. Last Radio. Take the central position as the benchmark, turn In FM/Bluetooth/USB mode, long press this counterclockwise to turn down the bass, and turn button to turn down the volume. clockwise to turn up the bass. 5. Next Song/ (Next Radio in FM) 12. TREBLE VOL. In USB/Bluetooth mode, press this button to Take the central position as the benchmark, turn switch to the Next Song. counterclockwise to turn down the treble, and turn In FM mode, press this button to switch to the clockwise to turn up the treble. Next Radio. 13. MASTER VOL. In FM/Bluetooth/USB mode, long press this Adjust the level of all signals (except for EMC IN button to turn up the volume. on the rear panel), turn clockwise to turn up the 6. Mode Button volume, and turn counterclockwise to turn down It can switch to Bluetooth mode (BLUE), USB the volume. mode (USB), line input mode (AUX) and FM 14. POWER Press ON to turn on the power, while press OFF to turn off the power. This button has priority function. (Level with EMC 15. LEVEL LED Display the audio output level. mode (FM). 7. MIC1 IN IN on the rear panel) 8. MIC1 VOL. Guangzhou DSPPA Audio Co., Ltd 2 Rear Panel 1. POWER IN (Can switch to 110-220V) Connect working power. Insert the plug into the machine and then connect the power grid. Note: No terminal can be connected to the Ground wire, no matter directly or through other devices. 8. Audio Source Selection Switch (AUX2-MIC2. Note: Please turn down the volume or turn off the device before using the switch.) AUX2 and MIC2/24V. Phantom voltage switch by turning left and right. 12. 100V EMC IN (Note: When using external 100V emergency signal input, the machine ground wires 2. Radio Antenna Interface Connect the radio antenna. 3. DC24V Power Input DC24V backup power input interface. 4. Audio Power Output Terminal 5. AUX OUT 6. AUX1 IN 7. AUX2 IN 9. Phantom Voltage LED 10. MIC2 Balanced IN 11. AUX2/MIC2 VOL. of the two devices can not be connected.) 13. EMC IN VOL. 14. General EMC IN 3 1 INPUT VOLTAGE SWITCH DC IN 24V/4A AC110-120V 50-60Hz AC220-240V 50-60Hz AUX OUT AUX1 IN AUX2 IN MIC2 IN PUSH

+24V CAUTION RISK OF ELECTRIC SHOCK DO NOT OPEN

, COM 4 -16 70V 100V AMPLIFIER OUT AUX2 MIC2PHANTOM VOL VOL 2 FM ANT EMC IN 350mV V 0 0 1 3 4 5 6 7 89 10 111213 14 Operating Instructions 1. MIC Mode microphone has no signal. 2. Bluetooth Mode 3. USB Mode 4. LINE Mode 5. FM Mode In any mode, when there is a broadcasting through the microphone, the system will detect the voice from the microphone and mute other sources. And it will return to the original play status when the Press the MODE button to display BLUE on the digital screen. The BLUE will keep flashing until the pairing is successful. Please turn on the Bluetooth of mobile phone or other audio source devices to search the Bluetooth device MP250UB for pairing, with wireless transmission distance10m. When a USB is inserted, it will be adjust to USB mode automatically (Plug and play). Press the MODE button to display AUX on the digital screen and enter the AUX mode. Please refer to the part 3, 4 and 5 of Front Panel for operation details. Remote Controller The remote controller is as shown below.. Function Keys:

Mode button for working mode switching. Power switch EQ button Play/Pause / (Auto radio searching in FM) 0-9 numeric keys, can be combined as a digital channel in FM for selection. Mute button Last song / (Last radio in FM) Next song / (Next radio in FM) Vol-

Vol+

Cycle Record button Guangzhou DSPPA Audio Co., Ltd 4 Model ALF-250W-UB Power Supply AC110-120V / AC220~240V 50/60Hz(Select via the switch) Specification MIC1 IN Sensitivity MIC2 IN Sensitivity AUX1 IN Sensitivity AUX2 IN Sensitivity EMC IN Sensitivity Noise Distortion Treble Adjustment Bass Adjustment 10mV10%

15mV10%

350mV10%

350mV10%

350mV10%

<10mV

<1% 1KHz 10dB2 10dB2 MIC Frequency Response 200Hz10kHz3dB AUX Frequency Response 100Hz16kHz3dB Rated Output Power 250W Interface Output Voltage 70V,100V(Constant voltage output). Machine Dimension (DWH) 363292106mm Package Dimension 363292106mm (1PC) Maximum Package Dimension 610390240mm (4PCS) Net Weight Gross Weight 3KG 3.7Kg (1PC)

*Note: When the power supply is switched to 110V, the machine can not be powered by 220V, otherwise it will be burned. Packing List Component Mini Mixer Amplifier .................................................................................................................................... 1 User Manual ............................................................................................................................................... 1 Warranty Card ............................................................................................................................................ 1 Certificate ................................................................................................................................................... 1 Remote Controller ...................................................................................................................................... 1 Bluetooth Receiving Antenna ..................................................................................................................... 1 Quantity 5 DSPPA Audio The specification will be subject to changes without notices. FCC Statement This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions:

(1) This device may not cause harmful interference, and (2) this device must accept any interference received, inclu ding interference that may cause undesired operation. Any Changes or modifications not expressly approved by the party responsible for compliance could void the users authority to operate the equipment. Note: This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to p art 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, t here is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, equipment generates, uses and can radiate radio frequency energy and

, if not installed and used in accordance with the instructions, may cause harmful interference to radio communicati ons. However, there is no guarantee that interference will not occur in a particular installation. If this equipment doe s cause harmful interference to radio or television reception, Reorient or relocate the receiving antenna. Increase the separation between the equipment and receiver. Connect the equipment into an outlet on a circuit different from that to which the receiver is connected. Consult the dealer or an experienced radio/TV technician for help. FCC RF Radiation Exposure Statement The device has been evaluated to meet general RF exposure requirement.

FCC ID: 2AXMO-ALFUB Label and Location This device complies with part 15 of the FCC Rules. MIXER AMPLIFIER ALFATRON Model No.: ALF-250W-UB FCC ID: 2AXMO-ALFUB interference that may cause undesired operation. device may not cause harmful interference, and (2) this device must accept any interference received, including Operation is subject to the following two conditions: (1) This Label and Location

ALFATRON ELECTRONICS GmbH Lichweg 12 , 53604 Bad Honnef , Germany Date: 2020-09-25 Dear Sir/Madam, We, ALFATRON ELECTRONICS GmbH Hereby declares the following statement for Federal Communications Commission, PCB board, circuit, structure and internal of these model(s) are the same, Only model number is different for these model:

FCC ID: 2AXMO-ALFUB Product name: MIXER AMPLIFIER Model no.: ALF-250W-UB, ALF-120W-UB, ALF-60W-UB Sincerely, Name/Title Company:

Address:

Phone:

E-Mail:

Joseph Milan/Manager ALFATRON ELECTRONICS GmbH Lichweg 12 , 53604 Bad Honnef , Germany 004917631660072 joseph@alfatronelectronics.de

CONFIDENTIALITY REQUEST for Certification Service in USA Federal Communication Commission Equipment Authorization Division, Application Processing Branch 7435 Oakland Mills Road Columbia, MD 21046 Date: 2020/09/26 TO WHOM IT MAY CONCERN Pursuant to Paragraphs 0.457 and 0.459 of the Commissions Rules (47 C.F.R.) and Section 552(b)(4) of the Freedom of Information Act, we requests confidentiality for the following products:

FCC ID 2AXMO-ALFUB ALF-250W-UB, ALF-120W-UB, ALF-60W-UB For the product stated above, we request that the following information be held confidential;

Model name Exhibits Long-Term Confidentiality Short-Term Short-Term Confidentiality Confidentiality Days External Photos Internal Photos Block Diagram Schematics Test Setup Photos Users Manual Parts List Tune Up Operational Descriptions The long-term confidentiality exhibits contain our trade secrets and proprietary information that could be of benefit to our competitors. The short-term confidentiality on the basis of ensuring that business sensitive information remains confidential until the actual marketing of our new device. If you have any questions, please feel free to contact me at the address shown below. Sincerely, Name/Title Company:

Address:

Phone:

E-Mail:

Joseph Milan/Manager ALFATRON ELECTRONICS GmbH Lichweg 12 , 53604 Bad Honnef , Germany 004917631660072 joseph@alfatronelectronics.de

ALFATRON ELECTRONICS GmbH Lichweg 12 , 53604 Bad Honnef , Germany Federal Communications Commission Authorization and Evaluation Division Equipment Authorization Branch 7435 Oakland Mills Road Columbia, MD 21046 To whom it may concern:

2020/09/26 We, ALFATRON ELECTRONICS GmbH the undersigned, hereby authorize Eurofins Product Service GmbH to act on our behalf in all matters relating to applications for equipment authorization FCC ID:

2AXMO-ALFUB including the signing of all documents related to these matters. Any and all acts carried out by Eurofins Product Service GmbH on our behalf shall have the same effect as acts of our own. We also hereby certify that no party to this application is subject to a denial of benefits, including FCC benefits, pursuant to Section 5301 of the Anti-Drug Abuse Act of 1988, 21 U.S.C. 862. Joseph Milan/Manager ALFATRON ELECTRONICS GmbH Lichweg 12 , 53604 Bad Honnef , Germany 004917631660072 joseph@alfatronelectronics.de Sincerely, Name/Title Company:

Address:

Phone:

E-Mail: