DAJUNGUO ZK-TB21 Bluetooth 5.1 2.1 Channel Power AmpManual ho an'ny mpampiasa lifier

1. Fampidirana

This manual provides detailed instructions for the setup, operation, maintenance, and troubleshooting of your DAJUNGUO ZK-TB21 Bluetooth 5.1 2.1 Channel Power Amplifier Board. Please read this manual thoroughly before use to ensure proper functionality and safety.

2. Toetran'ny vokatra

TPA3116D2 Chip: Utilizes TPA3116D2 chips with anti-interference capabilities, ensuring excellent sound quality and low Total Harmonic Distortion (THD) even during prolonged high-power operation.
Dual Input Modes: Supports both Bluetooth 5.1 and 3.5mm AUX audio inputs, offering broad compatibility with various devices such as smartphones, televisions, and laptops.
External Bluetooth Antenna Support: Features a first-generation IPEX interface for connecting an external U.FL/IPEX 2.4G antenna, enhancing Bluetooth connection stability.
Fiarovana feno: Equipped with multiple safety mechanisms including short-circuit protection, over-current protection, over-heat protection, and anti-reverse protection for reliable operation.
Fanaraha-maso feo azo amboarina: Independent adjustment for subwoofer volume and frequency, as well as R&L channel treble and bass.

3. Ny votoatin'ny fonosana

Ny fonosana dia misy:

1 x DAJUNGUO ZK-TB21 Power AmpLifier Board
(Additional accessories such as screwdriver, knobs, and power adapter may be included depending on the specific product variant or bundle.)

4. Torolàlana fananganana

Araho ireto dingana ireto mba hametrahana ny anao ampsolaitrabe fanalefahana:

4.1 Famantarana singa

Familiarize yourself with the various components and connection points on the ampsolaitrabe.

Diagram of ZK-TB21 amplifier board with labeled components

Sary 1: TAPITRAview ny ZK-TB21 amplifier board, highlighting the 3.5mm AUX input, passive speaker and subwoofer terminals, DC power input, heat sink, volume, treble, bass, subwoofer volume, and subwoofer frequency controls, and the Bluetooth antenna base.

4.2 Fifandraisana famatsiana herinaratra

Connect a DC 12-24V power supply to the DC input socket (5.5x2.1mm, spark-free). Ensure the power supply meets the voltage and current requirements (5A or above) for optimal performance. It is recommended to connect the power supply to the amplifier board first, then plug it into the AC outlet to avoid minor sparks.

Close-up of TPA3116D2 chip, upgraded DC socket, treble/bass controls, and large heat sink on ZK-TB21 ampbirao mpamonjy aina

Sary 2: antsipiriany view showing the upgraded DC socket (5.5x2.1mm, compatible with 5.5x2.5mm) for power input, the TPA3116D2 chip, and the large heat sink.

4.3 Fifandraisana amin'ny mpandahateny

Connect your passive speakers and passive subwoofer to the designated terminals. Ensure correct polarity (+ and -) for each connection. The amplifier supports 2.1 channels (stereo left/right and a subwoofer channel).

Passive Speakers (R & L Channel): Connect your main stereo speakers.
Passive Subwoofer (S Channel): Connect your passive subwoofer.

For speaker impedance, refer to the specifications section. If using 4-ohm speakers with a 24V input, it is recommended to use a 19V DC power supply to prevent potential issues.

4.4 Bluetooth Antenna (Optional)

For enhanced Bluetooth stability, an external U.FL/IPEX 2.4G antenna can be connected to the IPEX(MHF1) interface. This antenna needs to be purchased separately.

Diagram showing correct IPEX(MHF1) antenna specification (3.22mm/0.127inch) and incorrect MHF4 antenna specification

Sary 3: Illustration of the correct IPEX(MHF1) antenna specification (3.22mm/0.127inch) for the Bluetooth antenna base, and an incorrect MHF4 antenna type.

ZK-TB21 amplifier board showing Bluetooth 5.1 and 1st generation IPEX interface for external 2.4G antenna

Sary 4: ny amplifier board with a visual indicator for Bluetooth 5.1 and the IPEX interface for connecting an external 2.4G antenna.

5. Torolàlana miasa

5.1 Power On/off

Once all connections are secure, turn on the power supply. The amplifier board will power on automatically. Use the main volume knob to turn the unit on or off (usually by rotating it fully counter-clockwise until a click is heard for off, and clockwise for on).

5.2 Fantenana fampidirana

The ZK-TB21 supports two input modes: Bluetooth and AUX. The amplifier automatically detects the active input. If both are connected, Bluetooth usually takes priority.

5.2.1 Fifandraisana Bluetooth

Ataovy azo antoka ny ampMirehitra ny solaitrabe fanafanana.
Amin'ny fitaovanao (oh: smartphone, tablette), avelao ny Bluetooth ary tadiavo ireo fitaovana misy.
Select "ZK-TB21" from the list to pair. A confirmation sound may indicate a successful connection.
Manomboka milalao feo amin'ny fitaovanao.

ZK-TB21 amplifier board connected via Bluetooth to a smartphone playing music, with speakers

Sary 5: The ZK-TB21 amplifier board receiving audio wirelessly via Bluetooth 5.1 from a smartphone, connected to speakers.

5.2.2 AUX Input Connection

Connect your audio source (e.g., CD player, computer) to the 3.5mm AUX input jack on the amplifier board using a 3.5mm audio cable.
Manomboka milalao feo amin'ny fitaovanao.

ZK-TB21 amplifier board connected via 3.5mm AUX input to an audio device, with speakers

Sary 6: The ZK-TB21 amplifier board connected to an audio device via its 3.5mm AUX input, providing a wired audio connection.

5.3 Fanitsiana Audio

Use the control knobs on the front panel to fine-tune your audio output:

Boky lehibe: Manitsy ny habetsahan'ny vokatra ankapobeny.
R&L Channel Treble: Adjusts the high-frequency response of the main stereo channels.
R&L Channel Bass: Adjusts the low-frequency response of the main stereo channels.
Haben'ny subwoofer: Manitsy ny haavon'ny fivoahan'ny fantsona subwoofer.
Subwoofer Freq (Frequency): Adjusts the crossover frequency for the subwoofer, determining which low frequencies are sent to the subwoofer.

6. Fikojakojana

Fanadiovana: Mampiasà lamba malefaka sy maina hanadiovana ny amplifier board. Avoid using liquid cleaners or solvents.
rivotra: Ataovy azo antoka ny amplifier board is placed in a well-ventilated area to prevent overheating. Do not obstruct the heat sink. Adequate airflow is crucial for long-term performance.
fitahirizana: Rehefa tsy ampiasaina mandritra ny fotoana maharitra dia tehirizo ny ampapetraka amin'ny toerana mangatsiatsiaka sy maina lavitry ny tara-masoandro mivantana sy ny hafanana tafahoatra.

7. Famahana olana

Raha sendra olana amin'ny ZK-TB21-nao ianao ampsolaitrabe fanalefahana herinaratra, jereo ireto olana sy vahaolana mahazatra manaraka ireto:

OLANA	Antony mety hitranga	vahaolana
Tsy misy feo mivoaka	Power supply not connected or faulty. Speakers not connected correctly or faulty. Input source not selected or playing. Ambany loatra ny volume.	Check power connections and ensure the power supply is functional. Verify speaker wiring and polarity. Test speakers with another device if possible. Ensure Bluetooth is paired or AUX cable is securely connected and audio is playing. Increase the main volume knob.
Poor sound quality / Distortion	Incompatible power supply (voltage/current). Speaker impedance mismatch. Input signal too high or low. Mihoatra ny hafanana.	Use a power supply within the recommended 12-24V range and at least 5A. Ensure speakers meet impedance requirements (e.g., >4 ohms for 24V input). Consider a 19V power supply for 4-ohm speakers. Adjust the volume on your input device. Ataovy azo antoka tsara ny rivotra manodidina ny amplifier board. Reduce volume if distortion occurs at high levels.
Bluetooth connection unstable or drops	Distance from source device. Fanelingelenana avy amin'ny fitaovana hafa. No external antenna connected.	Move the source device closer to the ampLifer. Minimize other wireless devices nearby. Consider installing an external IPEX 2.4G antenna for improved range and stability.

8. Famaritana

Key technical specifications for the DAJUNGUO ZK-TB21 Power AmpBiraon'ny liifier:

endri-javatra	famaritana
MODELY	ZK-TB21
Audio Input	Bluetooth 5.1 + AUX (3.5mm)
Fampidirana Voltage	DC 12-24V
Chip	2 x TPA3116D2
Fanamboarana fantsona	2.1 Channel (Stereo L/R + Subwoofer)
Hery famoahana (Max)	50W (L) + 50W (R) + 100W (Subwoofer)
Parametera mpandahateny	20-100W (4-8Ω)
Haben'ny vokatra (L x W x H)	3.93 x 3.89 x 0.86 santimetatra (9.9 x 9.9 x 2.2 cm)
lanja	7.41 oz

8.1 Power Output Table

The following table details the approximate power output based on input voltage and speaker impedance:

Power output table for ZK-TB21 amplifier showing wattage at different voltages and speaker impedances

Sary 7: Detailed power output table for the ZK-TB21, illustrating the wattage for R&L channels and subwoofer at 12V, 21V, and 24V, across various speaker impedances.

Note: When the input voltage is 24V, the impedance of the speakers must be greater than 4 ohms. If the speaker impedance is equal to 4 ohms, it is recommended to use a 19V DC power supply.

9. Warranty sy fanohanana

DAJUNGUO is committed to customer satisfaction. If you have any questions about the product or encounter quality issues, please contact our customer service team. We offer 7x24 hours after-sales service to provide you with a satisfactory resolution.

For support, please refer to the contact information provided with your purchase or visit the official DAJUNGUO store on Amazon.

Manufacturer: DAJUNGUO