ZK-TB21 TPA3116D2 bluetooth 5.0 Subwoofer Amplifier Board 50WX2+100W 2.1 Channel Power Audio Stereo Bass AMP
Specifications:
Model: ZK-TB21
Material: electronic components
Color: Black
Bluetooth Version: 5.0(no shielding, 10m)
Input sensitivity: 500mV
Audio Input: AUX+Bluetooth
Channel: 2.1
Chip: TPA3116D2(with AM anti-interference function)
Power: DC12-24V/5A
Adapter speaker: 20-100W, 4-8Ω
Output power: Max.50W(R and L channel), Max.100W(subwoofer)
Protection Mechanism: overvoltage ,undervoltage,overhearing,DC detection,short circuit protection
Size: 118x100x22mm/4.6x3.9x0.8inch
Note:
Transition: 1cm=10mm=0.39inch
Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid.
Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!
Package Included:
1 x ZK-TB21 Amplifier Board
Q&A:
1. How to choose the power supply?
The power supply with the board is very key, the selected power supply ripple must be small, ripple large power supply will lead to power amplifier bottom noise, there is a current sound.The higher the voltage, the higher the current, and the higher the power output. If you only have 12V 1A, you can have 3-4 inch speakers.If you are above 19V 5A, no problem with 8-10 inches, power must be highly valued.If the voltage is too low and the sound is amplified, it will easily cause sound distortion. If the current is too low and the horn cannot be brought up, the voltage will be pulled down, which will lead to abnormal operation or poor sound quality.
It is recommended to use 18V19V24V power supply with current above 5A.If you only have 9V12V or 1A 2A power supply, you can also use it but with low power. When using it, choose the volume close to the maximum, which may cause distortion and affect the sound quality.
2. How to select speakers?
About the speaker type: commonly used speakers are generally 4-8 ohms, can be used.Speakers in left and right channels need to be connected to full frequency or medium and high frequency speakers with power between 20W and 100W.Subwoofer speakers cannot be connected to ordinary speakers. Speakers with subwoofer speakers should be connected, with power between 20-100W.The subwoofer horn must have a dive frequency of at least 50Hz.
If your speaker power is small, such as between 20W-50W can also be used, the power supply voltage needs to be small, to prevent the loudspeaker burnt after loud, such as choose power below 15V.If you are a 50W-100W speaker, you don't have to worry about burning out the horn. You can choose a 12-24V power supply. The higher the voltage you choose, the more sound or power you can output.Speaker power is not easy to exceed 100W, otherwise it will affect the sound quality.
3. Audio input mode
There are two audio input modes for this audio amplifier module: one is Bluetooth input and the other is AUX input. Bluetooth mode is preferred.Bluetooth can be connected in either mode.As long as the Bluetooth connection is successful, it is bluetooth mode, and bluetooth mode supports automatic back up.AUX insert is AUX mode when Bluetooth is disconnected.It should be noted that the bluetooth connection of this module is disconnected when using AUX mode.
4. How to adjust the main volume?
The MAIN - VOLUME knob is used to adjust the MAIN VOLUME.The right main volume goes up and the left main volume goes down.The master volume affects both the left and right channels and the subwoofer volume.
5. How to adjust the height and bass of the left and right channels?
R&L CHANNEL - BASS knob is for BASS, right-handed BASS enhancement, and left-handed BASS attenuation.When the knob is in the right-most position, it does not enhance or attenuate the bass.
The R&L CHANNEL - TREBLE knob is used to control the TREBLE, with right-handed TREBLE enhancement and left-handed TREBLE attenuation.When the knob is in the middle, it does not enhance or attenuate the treble.
Note when adjusting high and low sounds: when the TREBLE or BASS sounds are right-rotated to near maximum, if the sound distortion is distorted, the gain of the TREBLE or BASS sounds is too large. It is necessary to turn the TREBLE or BASS knob to the left to lower the gain or turn the MAIN-VOLUME knob on the right to the left to reduce the total VOLUME.
6. How to adjust the subwoofer?
SUBWOOFER - VOLUME controls the VOLUME of the SUBWOOFER.The right-handed volume goes up and the left-handed volume goes down.
The SUBWOOFER - FREQ knob controls the cutoff frequency of the SUBWOOFER.The right frequency increases and the left frequency decreases.The frequency adjustment range is 20HZ-200Hz.
7.What factors are associated with sound quality?
The quality of sound is not only related to the power amplifier module, but also to the power supply, sound source and the whole sound system.Basically every link of the sound system will affect the sound quality, among which the main link is the audio transmission line, audio power supply, tone circuit, amplifier circuit, speakers and the surrounding environment.The sound quality is best when the sound source, power supply, amplifier module and the speaker are matched.
(1) FREE Shipping 10 - 15 business days, (2) Standard Shipping 7 - 12 business days.
Shipping and Delivery Estimates
We ship in-stock orders as soon as possible. This is often within two business days, but there are situations where it may take longer. All estimates are based on business days.
Note:
(1) The shipping time mentioned above refers to the estimated time of business days that the shipment will take after an order has been shipped.
(2) Business days do not include Saturday/Sunday and any public holidays.
(3) These estimates are based on normal circumstances and are not a guarantee of delivery times.
(4) We are not responsible for the failures or delays in delivery resulting from any force majeure event, such as natural disaster, bad weather, war, customs issues, and any other event beyond our direct control.
for more information please visit our Shipping Policy Page.
Our policy lasts 14 days. If 14 days have gone by since your purchase, unfortunately we can't offer you a refund or exchange. To be eligible for a return, your item must be unused and in the same condition that you received it. It must also be in the original packaging.
Sizing & Fit Guide
Please be aware that most of our clothing is Juniors' sizing, which runs smaller than regular US / European Women sizing. Refer to the measurements chart for each individual product to determine the best size for you. Product specific size chart and information can be found in product description or in product picture gallery.
Our team does it's best to include accurate size details and measurement of each item in the product descriptions. If you have questions regarding sizing or any other information on a specific item, please email us at support@mrslm.com for specific details.
Find the best size
When comparing your measurements to those listed on the site, make sure to check if the fabric is stretchy or not. If it is, it can stretch an inch or more.
- Bust: Wrap the measuring tape loosely around the fullest part of your bust to ensure a comfortable fit.
- Waist: Measure the narrowest part of your natural waist, holding the measuring tape loose enough to fit comfortably.
- Hips: Drape the measuring tape around the widest part of your hips, resting the tape comfortably against your body.
- Length: For tops and dresses, measure from the top of your shoulder to the hem. For strapless dresses, measure from the highest part of the neckline to the hem. For pants and skirts, measure from the top of the waist to the hem.
- Sleeve: With your arm outstretched, measure from the base of your neck to the end of the sleeve hem to determine where the sleeve length will fall on you.
Size Chart
Dresses Size Chart
Dress Size Chart (Inch)
|
DRESSES SIZE IN INCHES |
||||
| SIZE | US / CAN | BUST | WAIST | HIPS |
| XS | 0 | 31"-32" | 24"-25" | 34"-35" |
| S | 2-4 | 33"-34" | 26"-27" | 36"-37" |
| M | 6-8 | 35"-36" | 28"-29" | 38"-39" |
| L | 10-12 | 37"-39" | 30"-32" | 40"-42" |
| XL | 14 | 40"-42" | 33"-35" | 43"-45" |
Dress Size Chart (cm)
|
DRESSES SIZE IN CM |
||||
| SIZE | US / CAN | BUST | WAIST | HIPS |
| XS | 0 | 78.7-81.2 | 60.9-63.5 | 86.3-88.9 |
| S | 2-4 | 83.8-86.3 | 66-68.5 | 91.4-93.9 |
| M | 6-8 | 88.9-91.4 | 71.1-73.6 | 96.5-99 |
| L | 10-12 | 93.9-99 | 76.2-81.2 | 101.6-106.6 |
| XL | 14 | 101.6-106.6 | 81.2-88.9 | 109.2-114.3 |
Tops Size Chart
Tops Size Chart (Inch)
|
TOPS SIZE IN INCHES |
|||
| SIZE | US / CAN | BUST | WAIST |
| XS | 0 | 31"-32" | 24"-25" |
| S | 2-4 | 33"-34" | 26"-27" |
| M | 6-8 | 35"-36" | 28"-29" |
| L | 10-12 | 37"-39" | 30"-32" |
| XL | 14 | 40"-42" | 33"-35" |
Tops Size Chart (cm)
|
TOPS SIZE IN CM |
|||
| SIZE | US / CAN | BUST | WAIST |
| XS | 0 | 78.7-81.2 | 60.9-63.5 |
| S | 2-4 | 83.8-86.3 | 66-68.5 |
| M | 6-8 | 88.9-91.4 | 71.1-73.6 |
| L | 10-12 | 93.9-99 | 76.2-81.2 |
| XL | 14 | 101.6-106.6 | 83.8-88.9 |
Bottoms Size Chart
Bottoms Size Chart (Inch)
|
BOTTOMS SIZE IN INCHES |
|||
| SIZE | US / CAN | WAIST | HIPS |
| XS | 0 | 24"-25" | 34"-35" |
| S | 2-4 | 26"-27" | 36"-37" |
| M | 6-8 | 28"-29" | 38"-39" |
| L | 10-12 | 30"-32" | 40"-42" |
| XL | 14 | 33"-35" | 43"-45" |
Bottoms Size Chart (cm)
|
BOTTOMS SIZE IN CM |
|||
| SIZE | US / CAN | WAIST | HIPS |
| XS | 0 | 60.9-63.5 | 86.3-88.9 |
| S | 2-4 | 66-68.5 | 91.4-93.9 |
| M | 6-8 | 71.1-73.6 | 96.4-93.9 |
| L | 10-12 | 76.2-81.2 | 101.6-106.6 |
| XL | 14 | 83.8-88.9 | 109.2-114.3 |
Denim Size Chart
Denim Size Chart (Inch)
|
DENIM SIZE IN INCHES |
||||
| WAIST SIZE | JUNIOR SIZING | WAIST | LOW WAIST | HIPS |
| 24 | 0 | 24"-25" | 26"-27" | 32"-33" |
| 25 | 1 | 25"-26" | 28"-29" | 33"-34" |
| 26 | 3 | 26"-27" | 30"-31" | 34"-35" |
| 27 | 5 | 27"-28" | 31"-32" | 35"-36" |
| 28 | 7 | 28"-29" | 32"-33" | 36"-37" |
| 29 | 9 | 29"-30" | 33"-34" | 37"-38" |
| 30 | 11 | 30"-31" | 34"-35" | 38"-39" |
| 31 | 13 | 31"-3" | 35"-36" | 39"-40" |
| 32 | 15 | 32"-33" | 36"-37" | 40"-41" |
Denim Size Chart (cm)
|
DENIM SIZE IN CM |
||||
| WAIST SIZE | JUNIOR SIZING | WAIST | LOW WAIST | HIPS |
| 24 | 0 | 60.9-63.5 | 66-68.5 | 81.2-83.8 |
| 25 | 1 | 63.5-66 | 71.1-73.6 | 83.8-86.3 |
| 26 | 3 | 66-68.5 | 76.2-78.7 | 86.3-88.9 |
| 27 | 5 | 68.5-71.1 | 78.7-81.2 | 88.9-91.4 |
| 28 | 7 | 71.1-73.6 | 81.2-83.8 | 91.4-93.9 |
| 29 | 9 | 73.6-76.2 | 83.8-86.3 | 93.9-96.5 |
| 30 | 11 | 76.2-78.7 | 86.3-88.9 | 96.5-99 |
| 31 | 13 | 78.7-81.2 | 88.9-91.4 | 99-101.6 |
| 32 | 15 | 81.2-83.8 | 91.4-93.9 | 101.6-104.1 |
Swimwear Size Chart
Swimwear Size Chart (Inch)
|
SWIMWEAR SIZE IN INCHES |
||||
| SIZE | US / CAN | BUST | WAIST | HIPS |
| XS | 0 | 31"-32" | 24"-25" | 33"-34" |
| S | 2 | 33"-34" | 26"-27" | 35"-37" |
| M | 4 | 35"-36" | 28"-29" | 37"-38" |
| L | 6 | 37"-39" | 30"-32" | 39"-41" |
| XL | 8 | 40"-42" | 33"-35" | 42"-44" |
Swimwear Size Chart (cm)
|
SWIMWEAR SIZE IN CM |
||||
| SIZE | US / CAN | BUST | WAIST | HIPS |
| XS | 0 | 78.7-81.2 | 60.9-63.5 | 83.8-86.3 |
| S | 2 | 83.8-86.3 | 66-68.5 | 88.9-93.9 |
| M | 4 | 88.9-91.4 | 71.1-73.6 | 93.9-96.5 |
| L | 6 | 93.9-99 | 76.2-81.2 | 99-104.1 |
| XL | 8 | 101.6-106.6 | 81.2-88.9 | 106.6-111.7 |
Shoes Size Chart
| US | EURO | UK | AUS | JAPAN | CHINA |
| 5 | 35-36 | 3 | 3.5 | 21.5 | 35 |
| 5.5 | 36 | 3.5 | 4 | 22 | 35.5 |
| 6 | 36-37 | 4 | 4.5 | 22.5 | 36 |
| 6.5 | 37 | 4.5 | 5 | 23 | 36.5 |
| 7 | 37-38 | 5 | 5.5 | 23.5 | 37 |
| 7.5 | 38 | 5.5 | 6 | 24 | 37.5 |
| 8 | 38-39 | 6 | 6.5 | 24.5 | 38 |
| 8.5 | 39 | 6.5 | 7 | 25 | 38.5 |
| 9 | 39-40 | 7 | 7.5 | 25.5 | 39 |
| 9.5 | 40 | 7.5 | 8 | 26 | 39.5 |
| 10 | 40-41 | 8 | 8.5 | 26.5 | 40 |
| 11 | 41-42 | 9 | 9.5 | 27.5 | 41 |
Attention: This guide provides general sizing information only, and fit can vary depending on style and brand. For more specific sizing information on the product, please refer to product description.
NOTE:
- All models are wearing size small in tops and dresses, and size 1, 3, or 5 in jeans depending on their body type.
- Most kalles jeans & dresses have some stretch, please refer to product description for fabric details.
- Most kalles bottoms have an inseam of 31-34” depending on the cut and style. Sizing may vary depending on cut and style.
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