2.1 Channel Amplifier Bluetooth Digital Power Amp Module Kit 50W*2+100W ZK-TB21
2.1 Channel Amplifier Bluetooth Digital Power Amp Module Kit 50W*2+100W ZK-TB21
2.1 Channel Amplifier Bluetooth Digital Power Amp Module Kit 50W*2+100W ZK-TB21
2.1 Channel Amplifier Bluetooth Digital Power Amp Module Kit 50W*2+100W ZK-TB21
2.1 Channel Amplifier Bluetooth Digital Power Amp Module Kit 50W*2+100W ZK-TB21
2.1 Channel Amplifier Bluetooth Digital Power Amp Module Kit 50W*2+100W ZK-TB21
2.1 Channel Amplifier Bluetooth Digital Power Amp Module Kit 50W*2+100W ZK-TB21


$24.95 Buy It Now or Best Offer
free,30-Day Returns





Seller Store
() %,

Location:
Ships to: US,
Item: 174409206982

eBay Description 2.1 Channel Amplifier Bluetooth Digital Power Amplifier Amp Module 50W*2+100W Unassembled ZK-TB21 Package Included: – 1 x Set of Power Amplifier Note: Please note that assembly of its shell is needed. 1. How to choose power supply? The power supply of the board is very critical. The ripple of selected power supply must be small. A power supply with large ripple will cause the noise of the bottom of power amplifier board to become larger and there will be current sound. The higher the voltage, the higher the current, and the more output power. If you only have a 12V 1A power supply, this can drive 3-4 inch speakers. If your power supply is above 19V 5A, drive 8-10 inch speakers. Power supply must be highly valued. If the voltage is too low, the sound is easily distorted after amplification. If the current is too small to drive speaker, the voltage will be pulled down, the work is not normal or the sound quality is deteriorated. Recommend to use 18V 19V 24V power supply, current 5A or more. If you only have 9V 12V or 1A 2A power supply, it can also be used but the power is small. When you use volume close to the maximum, it may be distorted and affect sound quality. 2. How to choose speakers? About speaker type: 4-8 ohm speakers can be used. Left and right channel speakers need to be connected to full-range speakers or high-frequency speakers, and the power is between 20W-100W. Subwoofer speaker can not be connected to ordinary speaker, you need to connect the speaker with the subwoofer speaker, the power is between 20-100. The dive frequency of the subwoofer speaker should be at least 50Hz. If your speaker power is small, for example, between 20W-50W, it can also be used. The power supply voltage needs to be lower to prevent the speaker from being burned after the sound is amplified. If you are a 50W-100w speaker, don’t worry about the speaker burnout, you can choose 12-24V power supply, the higher the voltage, the greater the output sound or power. Speaker power is not easy to exceed 100W, otherwise it will affect the sound quality. 3. Introduction of audio input mode: This audio power amplifier module has two audio input methods: one is Bluetooth input, and the other is AUX input, Bluetooth mode has priority. No matter in which mode Bluetooth can be connected. As long as the Bluetooth connection is successful, it is in Bluetooth mode, and the Bluetooth mode supports automatic connection back. When the Bluetooth is not connected, it is in AUX mode. It should be noted that when using AUX mode, you need to confirm that the Bluetooth connection of this module has been disconnected. 4. How to adjust the master volume? MAIN-VOLUME knob adjusts the master volume. Turn it to the right side to increase the volume. Turn it to the left side to decrease. The master volume affects both the left and right channels and the volume of the subwoofer. 5. How to adjust the high and low sound of left and right channels R&L CHANNEL-BASS knob controls bass. Rotate it to the right to enhance bass. Rotate to the left and the bass is attenuated. When the knob is at the rightmost position, the bass is not enhanced or attenuated. R&L CHANNEL-TREBLE knob controls treble. Rotate it to the right to enhance the treble. Turn it to the left to make treble attenuation. When the knob is in the middle position, the treble is neither enhanced nor attenuated. Pay attention to when adjusting the high and low sounds: When it s in treble or bass state, knob is is adjusted to near maximum, if the sound is distorted, it means that the gain of treble or bass adjustment is too large. At this time, you need to turn the treble or bass knob to the left to reduce the gain or rotate MAIN-VOLUME knob to the left to reduce the total volume. 6. How to adjust the subwoofer? SUBWOOFER-VOLUME knob controls the volume of subwoofer. Turn the knob to the right to increase the volume. Turn it to the left to decrease. SUBWOOFER-FREQ knob controls the cutoff frequency of subwoofer. Turn the knob to the right to increase frequency. Turn it to the left to decrease frequency. Frequency adjustment range is 20Hz-200Hz. 7. Sound is small and fine. After the sound becomes louder, the sound becomes muddy? The sound is distorted, please turn down the total volume or change power adapter with higher voltage level. 8. The sound is small and fine. After the sound becomes louder, the sound freezes? The power of input power supply is insufficient, the power supply itself is intermittently powered off. Please replace the power supply with a larger power; or the power is too large, the power amplifier board heats up seriously, and there is a case of thermal protection. Reduce power or strengthen heat dissipation. 9. What factors are related to the sound quality? Sound quality is related to the power amplifier module, and also to power supply, sound source and entire sound system. Basically, every link of audio system will affect sound quality. The main links include audio transmission line, audio power supply, tone circuit, power amplifier circuit, sound box and surrounding environment. Only when the sound source, power supply, power amplifier module and speaker match, the sound quality is the best. Payment Terms 1.We accept PayPal only. 2.All major credit cards are accepted through secure payment processor PayPal. 3.Payment must be received within 7 business days of auction closing. 4.We ship to your eBay or Paypal address. Please make sure your eBay and Paypal address is correct before you pay. Shipping Terms – For remote regions, we will charge your extra shipping costs. Usually it cost about 35USD-50USD. We will contact you after your payment. Thanks for your understanding. Return Terms 1. If you receive defective item, please kindly notify us within 14 days. We will guide you the returning instruction for replacement or refund. 2. If you purchased in improper condition, please NOTE that the sipping and handling fee will not be refund, all return shipping fee should paid by the buyer unless item DOA. 3. We reserve the right to refuse any returns for objective reasons. Custom Duties & Taxes 1. Import duties, taxes, and charges are not included in the item price or postage cost. These charges are the buyer’s responsibility. 2. Avoiding some unnecessary trouble, please check with your country’s customs office to inform us what we should declare its value before shipping. Feedback 1. If you are dissatisfied for any reason, please don’t be quick to leave us neutral or negative feedback. We work hard to make sure EVERY CUSTOMER 100% SATISFIED and resolve any problem for you and always leave positive feedback to all our customers. 2. If you are satisfied with the product you received, please kindly leave us a positive feedback and 5 star DSR. If there is any problem of your order, please feel free to contact us firstly, we are responsible and credible seller, will follow it for you asap. On Aug-25-20 at 21:34:06 PDT, seller added the following information:

Frequently Asked Questions About 2.1 Channel Amplifier Bluetooth Digital Power Amp Module Kit 50W*2+100W ZK-TB21 in My Website

garriswap.com is the best online shopping platform where you can buy 2.1 Channel Amplifier Bluetooth Digital Power Amp Module Kit 50W*2+100W ZK-TB21 from renowned brand(s). garriswap.com delivers the most unique and largest selection of products from across the world especially from the US, UK and India at best prices and the fastest delivery time.

What are the best-selling 2.1 Channel Amplifier Bluetooth Digital Power Amp Module Kit 50W*2+100W ZK-TB21 on garriswap.com?

garriswap.com helps you to shop online and delivers Casio to your doorstep. The best-selling Casio on garriswap.com are: Casio Data Bank VDB-2000 Tested Working CASIO GENERAL LTP-1129G-7ARDF WOMEN’S WATCH Women Classic Japan Quartz Analog Watch CASIO LTP-1141PA-7BEG White Dial 30mm Casio Moonphase Quartz Stainless Steel MTP-M305D-7A2VDF Apple Watch style Casio Digital Alarm Illuminator W-800HG-9AVDF W-800HG-9AV Men’s Watch Casio A178WA-1A Digital Mens Watch Original New Stainless Steel WR A-178 Casio Edifice Eqw-M600 Solar Radio Watch with Case CASIO Woman Metal Wrist Watch LTP-V007G-9B Original New Genuine Casio Watch Band strap GN1000-1A GN1000B-1A GN-1000 GULFMASTER 10627083 Casio AEQ110W-1AV, Telememo 30 Watch, 100M, 3 Alarms, Chronograph, World Time Casio F-91WC-4A Pink Original Alarm Chronograph Classic Digital Watch F-91 Retro CASIO CLASSIC 52QS-14B Reprint Digital Watch A1100G-5JF Men’s Wristwatch Unused CASIO CLASSIC Digital Men’s Wtist Watch F-91WB-8AJF Dark Gray Unused item in Box Men Sports Japan Quartz Digital Watch Alarm CASIO W-59-1VQES Grey Dial 37mm Casio General Digital W-218HC-8AVDF Unisex Watch Casio Women’s Runner Quartz Running Watch with Resin Strap, Black, 19.3 (Model: Casio Watch Baby G Radio Solar BGA-2800-4A2JF Rady Pink Beige CASIO CLASSIC Digital Wrist Watch Ladies LA700WE-4AJF Classic Model Unused item Casio Analog Moon Phase Leather Strap Silver Dial Quartz MTPM100L7A Mens Watch Casio Mw-59 Watch Unused But Battery Is Dead Genuine Casio Watch Strap F0R G-Shock Solar Atomic GW560 GW-5600J GW5600J-1 PINS CASIO TSR-110 THERMO SCANNER 100M WR VINTAGE DIGITAL WATCH JAPAN 1994 CASIO “CLASSIC” AQ-800EB-2AJF Navy Retro Modern VINTAGE Ana-Digi Chipkashi Retro Casio Women’s Watch Metal Band Gold Original New AQ-230GA-9D Casio Unisex Vintage Collection B640WMR-5A Rose Gold Stainless Steel Watch CASIO “CLASSIC” AQ-800E-3AJF Silver x Mint Green Retro Modern VINTAGE Ana-Digi JaysAndKays® BULLBARS® for Casio G-Shock G-9000 Mudman Protectors Wire Guards CASIO STANDARD CA-500WEG-1AJF Gold Standard Digital Watch Calculator Design Rare CASIO GENERAL LTP-1335D-1A2VDF UNISEX’S WATCH CASIO QUARTZ SILVER STAINLESS STEEL LTP-1165A-7C2DF WOMEN’S WATCH Casio GMAS110VW-4A Women’s Translucent Pink Analog Digital G Shock Watch CASIO Stongue Dard MQ-24UC-3BJF Khaki Men’s Watch New in Box CASIO PRO TREK PRG-30-5JF Tough Solar Compass Barometer Thermometer Men Watch Casio Baby-G Digital Bgd-560S-8 Bgd560S-8 200M Women’s Watch New NWT Casio GW-4000 Tough Solar Watch CASIO Unisex Wrist Watch F-94WA-8 CASIO Men Stainless Steel Watch Gold Unisex A168WG Unisex Free Size CASIO G-SHOCK DW-5600TLS-8JF BEACH TIME LAPSE Series Digital Men Watch NEW BOX Casio General Digital W-218HC-2AVDF Men’s Watch New Casio LA670WGA-6 Water Resistant Auto Calendar Daily LA670WGA-6 Casio Women LTP-1169D-1ADF Watch Metal Band Silver Black Original New G-Shock GX-56BB-1ER Casio Multifunction Watch Casio AW-90H-2BVDF Black Blue Wristwatch Analog and Digital Ana-Digi Vintage CASIO CLASSIC Digital Wristwatch Ladies LA700WEG-9AJF Classic Model Unused item CASIO BABY-G BGD-5650-1CJF Black Chronograph Digital Women’s Watch New in Box Casio Baby-G Digital Resin Strap Pink Dial BG-169U-1C 200M Women’s Ladies Watch CASIO WAVECEPTOR WVQ-M410DE-2A2JF Multiband 6 men Watch New in Box CASIO Men Analog Eco-Drive Casual Watch Classic Dress Blue Dial Waterproof Round CASIO LTP-1234GLL-7A Women Classic Japan Quartz Analog Watch Genuine Leather Casio WAVE CEPTOR WVA-M630D-2AJF Watch Japan NEW Domestic Version CASIO STANDARD CLASSIC Digital Watch AQ-230A-7AMQYJF Silver Ana-Digi Chipkashi Casio EDIFICE Slim Line Sapphire Black Dial Quartz EFR-S108D-1A 100M Mens Watch CASIO Women Analog Quartz Casual Watch Classic Dress White Dial Waterproof Round Casio Women’s LTP1237D-2A Silver-Tone Blue Dial Analog Quartz Watch Casio G-SHOCK GA2100-4A Men’s Octo Slim Casi-Oak Bold Red Analog-Digital Watch Casio G-Shock 5600 Series Men’s Wristwatch Super Mario Bros DW5600SMB-4 NEW! NISSAN GT-R G-SHOCK 6th DW₋5600 CASIO Collaboration Limited Edition watch Casio MTP-M305L-1A2 Moonphase Quartz Stainless Steel Men’s Watch M305L M305 CASIO CLASSIC Digital Wristwatch Ladies LA700WE-7AJF classic Model Unused item Casio Stainless Steel Black Dial Japan Mov’t Quartz MDV-107D-1A3 200M Mens Watch Casio DW-5600VT G-Shock Watch CASIO G-SHOCK DW-6900GDA-9JR Gold Daruma Design Men’s Watch New in Box Casio Digital Dual Time Khaki Resin Band Watch WS1700H-5A WS-1700H-5A Casio G-shock Black Men’s Watch – GST-B400-1AER Casio Standard Analog Watch LRW200H-7E1 CASIO Wristwatch GW-3000M-4A G-Shock Sky Cockpit Radio Solar Men’s Analog jp new CASIO G-Shock GA-2110SU-3AJF Japan Domestic New CASIO G-SHOCK MTG-B1000D-1AJF Silver Stainless Steel Solar Analog Watch Casio CFX 200 Watch – Excellent Condition Casio Analog Quartz MW-240-1B2V MW240-1B2V Men’s Watch G-SHOCK Limited Model Iridescent Color Casio Ana-Digi Watch Black Rainbo NEW JP Casio A168 Watch Men Silver Tone Digital Alarm Chronograph 34mm Rectangle Works Casio MTP-1302D-7A1VDF Men Analog Stainless Steel Watch Original New Casio W-69H-1B Illuminator Watch Casio Standard Analog Ladies Watch LTP1129A-7A Casio Standard Dress MTP-M305L-7A Men’s Watch Casio Digital Stainless Steel LA670WA-7DF Womens Watch LA670WA-7D Original New Casio Vintage Digital Multicolor Dial Casual Quartz Unisex Watch A168WEUC-1A Casio G-Shock Black Dial Solar Sports 200M Men’s Watch GPR-H1000-1 Casio Original W-800 Classic Mens Resin Alarm Chronograph Watch W800H W-800H-1A Casio Digital Tide Graph Moonphase Illuminator Quartz WS1700H1AV 100M Mens Watch Used Casio G-Shock Gm-2100B-3Ajf Watch 2023 August Arrival CASIO EDIFICE EFR-S108DJ-2BJF Sapphire Crystal Watch Turquoise Blue Dial 39.9mm [Casio] Watch [Domestic Genuine] Wave Setter WV-200R-2AJF Men Blue CASIO G-SHOCK GG-B100BTN-1AJR BURTON collaboration Quartz Men’s NEW F/S CASIO BABY-G G-SQUAD BSA-B100-1AJF Black Women’s Watch 2018 New in Box NIXON CASIO Square wristwatch Casio New Original MTP-1302D-7A1 Men Analog Stainless Steel Watch WR 50M MTP1302 Casio LW204-1A Women’s POP Black Rose Gold Alarm Chronograph Digital Watch Casio Vintage Digital Stainless Steel Quartz A168WER-2A Unisex Watch Casio G-Shock Solar G-Steel Mens Watch GST-B200-1A Brand New Without Tags Casio MRW-200H-1B Original New Black Analog Mens Watch 100m WR MRW-200 CASIO WAVE CEPTOR WVA-M630B-3AJF Tough Solar Atomic Radio Japan Green Khaki CASIO GA-B2100-1A1JF [G-SHOCK GA-B2100 SERIES Men’s Rubber Band] New Casio G-Shock GST-W130 Leather/Rubber Brown Original Watch Strap 10540150 Casio MTP-VD03D-3A2 Men’s Green Analog Watch Steel Band Date Indicator New [Near Mint] Casio G-Shock GW-M5610R-1JF Tough Radio Solar Casio Original AE-1200WHD-1A Digital World Time Man’s Sports Watch NEW AE-1200D Casio G-SHOCK Watch DW-5600BBMA-1 CASIO GENERAL LW-203-1AVDF UNISEX’S WATCH Mens Pullover Fleece Hoodie