Details
1.Adopt special inductor for high power digital amplifier, high current, low magnetic loss, small heat, use oxygen-free copper wire to improve sound quality, magnetic shielding mechanism to resist electromagnetic interference.
2. Carry two TPA3221, support 2.1 channel Bluetooth digital amplifier 100W + 100W + 200W high power.
3. Subwoofer expansion port, support the addition of 1602, 3002.
4. Multiple expansion port, can be connected to the microphone preamp board reverb input or output, easy to use.
5. With protection mechanism, with input undervoltage, input anti-reverse connection, overheating, overcurrent, short circuit protection.
Product Name: 2.1 channel Bluetooth amplifier board 100W+100W+200W
Product Model: ZK-ST21
Adaptable power supply: operating voltage range 12-30VDC, recommended voltage 24V-28V, current 10A or 10A or more DC power supply.
Maximum power: left or right channel - 105W@30V, 4Ω; 55W@30V, 8Ω. subwoofer - 208W@30V, 2Ω; 105W@30V, 4 Ω. In short, the higher the voltage, the lower the resistance, the higher the output power. The higher the voltage, the lower the resistance, the higher the output power.
Adaptable speakers: Left and right channels, support 3-8Ω, up to 100W speakers; subwoofer support 2-8Ω, up to 200W speakers.
Bluetooth chip: Jelly 5.1, transmission distance 15 meters
Input mode: Bluetooth + AUX + U disk + sound card
Number of channels: 2.1, left channel + right channel + subwoofer
Amplifier chip: two TI original TPA3221
Protection mechanism: input undervoltage, input anti-reverse connection, overheating, overcurrent, short circuit protection.
Product size: 121x100x25mm
1 x ST21 amplifier board
1 x Enclosure kit (optional)
5 x Cable (optional)
1. Shipment does not include power supply, audio cable.
2. Add external antenna (special scene):
2-1. board are with on-board antenna, the normal distance of 10-15 meters, if it is loaded into a metal shell (will shield the signal) or increase the Bluetooth distance (20-30 meters) will only use the external antenna.
2-2. Customers need to buy their own 2.4G antenna (antenna extension cable, antenna bar), this product does not include external antenna.
The items you ordered will be shipped out in 3 business day when your payment is clear. The arrival time is 5-20 business days to United States usually.
We maintain high standards of excellence and strive for 100% customer satisfaction! Feedback is very important to us. We request that you contact us immediately BEFORE you give us neutralor negative feedback, so that we can satisfactorily address your concerns.
This is the description of Payment Method.
Do not dismiss your dream.
To be without dream is to be without hope.
To be without hope is to be without purpose.
Do not run through your life so fast that you forget not only where you have been, but also where you are
going.
Life is not race, but a journey to be savored each step of the way.
This is the description of Returns Policy.
Do not dismiss your dream.
To be without dream is to be without hope.
To be without hope is to be without purpose.
Do not run through your life so fast that you forget not only where you have been, but also where you are
going.
Life is not race, but a journey to be savored each step of the way.
Copyright©2017 DataCaciques
Item Description
1.Adopt special inductor for high power digital amplifier, high current, low magnetic loss, small heat, use oxygen-free copper wire to improve sound quality, magnetic shielding mechanism to resist electromagnetic interference.
2. Carry two TPA3221, support 2.1 channel Bluetooth digital amplifier 100W + 100W + 200W high power.
3. Subwoofer expansion port, support the addition of 1602, 3002.
4. Multiple expansion port, can be connected to the microphone preamp board reverb input or output, easy to use.
5. With protection mechanism, with input undervoltage, input anti-reverse connection, overheating, overcurrent, short circuit protection.
Product Name: 2.1 channel Bluetooth amplifier board 100W+100W+200W
Product Model: ZK-ST21
Adaptable power supply: operating voltage range 12-30VDC, recommended voltage 24V-28V, current 10A or 10A or more DC power supply.
Maximum power: left or right channel - 105W@30V, 4Ω; 55W@30V, 8Ω. subwoofer - 208W@30V, 2Ω; 105W@30V, 4 Ω. In short, the higher the voltage, the lower the resistance, the higher the output power. The higher the voltage, the lower the resistance, the higher the output power.
Adaptable speakers: Left and right channels, support 3-8Ω, up to 100W speakers; subwoofer support 2-8Ω, up to 200W speakers.
Bluetooth chip: Jelly 5.1, transmission distance 15 meters
Input mode: Bluetooth + AUX + U disk + sound card
Number of channels: 2.1, left channel + right channel + subwoofer
Amplifier chip: two TI original TPA3221
Protection mechanism: input undervoltage, input anti-reverse connection, overheating, overcurrent, short circuit protection.
Product size: 121x100x25mm
1 x ST21 amplifier board
1 x Enclosure kit (optional)
5 x Cable (optional)
1. Shipment does not include power supply, audio cable.
2. Add external antenna (special scene):
2-1. board are with on-board antenna, the normal distance of 10-15 meters, if it is loaded into a metal shell (will shield the signal) or increase the Bluetooth distance (20-30 meters) will only use the external antenna.
2-2. Customers need to buy their own 2.4G antenna (antenna extension cable, antenna bar), this product does not include external antenna.
Payment
1.We only accept payment from PayPal.
2.Please make sure your eBay address is correct before you pay.
3.All payment Should be Completed within 7 days, or an unpaid disputed will be opened as payment none receive.
4.If you do not want to pay for the order please contact us via eBay message, we will help your cancel the transaction.
Shipping
1. We only ship to confirmed PayPal addresses.
2. Economy Shipping, with no tracking number.
Standard Shipping, with tracking number.
Express (Expedited) Shipping, with tracking number.
3. Economy shipping needs 2-5 weeks to arrive mostly.
In rare case, it can take up to 6-8 weeks.
It depends on your location and local postal service, as well as the weather condition along the shipping.
4. If you need a faster delivery time, you could choose
Express (Expedited) Shipping.
If you need a tracking number, you could choose Standard Shipping.
Return
1. We offer 60 day money back or replacement guarantee.
In addition, it allows customers to return new and unused products in their original factory condition for any reason within 60 days from the date of purchase.
2. Although we test each item and they are packed professionally, few item(less than 0.1%) might be damaged during the shipping. Please feel free to contact us within 4 days after you receive your package about replacement.
3. If you don't receive items over 35days ,please make sure to contact us before leaving any neutral or negative feedback.We'll try our best to help you solve the problem.
If we authorized the return, customers will get an email with instructions for returning the item. Email will be replied within 24 hours on Chinese business hours.
The sole and exclusive maximum liability to lifesteward arising from any product sold on lifesteward ebay account shall be the price of the product ordered.
Feeback
1. Customer satisfaction is our top goal. We believe our items are so outstanding. All products are quality checked. They are new and in good condition when shipped to our customers. We are convinced you will be happy with your Purchase.
2. If product is defective or damage upon arrival, or wrong product shipped, please contact us immediately. Returns accepted within 14 days of delivery date and item must be in original new condition, not worn or altered in any way with attached tags & wrap. Otherwise deal is final. Return shipping must be paid by buyer.
3. We appreciate your Postive Feedback, and will do the same in return. DO NOT leave negative feedback without first communication with us. Please allow max 2 business days for us to response.
On Apr 2, 2026 at 20:29:21 PDT, seller added the following information: