2.1 Subwoofer Power Amplifier Board LM1875 2.1 Three-channel Multimedia Audio Bass Amplifier Board

Parameter Product name 2 1 channel subwoofer power amplifier boardChip Specifications LM1875Product size 110mm 77mm 47mm excluding potentiometers and other protruding parts Product weight 140g ±3gOutput power 3X20W LM1875Power supply voltage double power transformer 11V 15VPotentiometer spacing 24mm24mmDriving capacity It is recommended to use full range speakers of 4Ω 8Ω above 4 inches for left and right channels and long stroke large diameter subwoofers of 4Ω 8Ω above 6 inches are recommended for subwoofers Notice 1 Be sure to check whether the wiring is correct before turning on the power Be careful of short circuit The wrong wiring will easily burn the chip 2 When the power amplifier board is working it will be hot don t worry the chip heat is normal the temperature of the heat sink is very high please do not touch it 3 The power amplifier board generates a lot of heat Please pay attention to ventilation and heat dissipation For a long time or heavy load you can add a cooling fan or change to a larger heat sink 4 Please do not use small speakers Ordinary small speakers do not work well In general we do not recommend that customers make their own subwoofers unless they are very proficient in speaker parameter selection and cabinet processing Limited to the actual conditions it is difficult for ordinary players to make their own speakers with very good results It is recommended to buy finished boxes to make speakers Choose large diameter and