We have various original IC amplifiers including Mk-21 and 502Mt. We have 12-volt 10-ampere power supplies. We have 6-inch five-core and some small speakers. We have various types of circuits including 3.7-volt BMS and Bluetooth circuits. We can provide speakers and clutch D amplifiers according to your preference at a very affordable price. Don't delay, let us know what you need. Thanks in advance.