Tip: To have enough output if the audio input is sufficient and the supply voltage/current is sufficient. The supply voltage is higher and the relative will be larger. The speakers with different impedances will have different output . In the case of sufficient voltage and current, the larger the ohms of the horn, the smaller the relative sound . Please pay attention! Product Name: MINI 2 x 100W Bluetooth 5.0 Amplifier Module Product Model: -1002M Chip Model: Domestic Amplifier Chip Audio Input: Bluetooth+AUX+USB Flash Disk+Computer USB(plug and play) Supply: DC5-24V(High Recommended High Voltage) Adapter Speaker: 20-200W; 4-8 Channels: Left And Right Stereo (Stereo) Bluetooth Version: 5.0( Greater than 15 Meters Without Occlusion) Bluetooth Name: Wuzhi Audio Protection Mechanism: Overheat, Overcurrent, Short Circuit Protection Supply Voltage: 12V-----8/20W+20W, 4/40W+40W 15V-----8/35W+35W, 4/60W+60W 19V-----8/55W+55W, 4/80W+80W 24V-----8/70W+70W, 4/100W+100W Compatible Audio & Video Equipment Style: Speakers Compatible Audio & Video Equipment Style: Amplifier Compatible Audio & Video Equipment Style: player colour:Black Material:plastic size: 60 x 60 x 29mm Package Contents: 1 x Module Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.