2.1 Amplifier Module DIY TDA7377 

The TDA7377 is a new technology class AB car radio amplifier able to give you 2channel stereo and one Sub configuration. The exclusive fully complementary structure of the output stage and the internally fixed gain guarantees the highest possible power performances with an extremely reduced component count. The onboard clip detector simplifies gain compression operation while giving you volume, bass and treble control. 
This makes the 2.1stereo/bright DIY kit very popular for home speaker boxes. 

Datasheet: for TDA7377

Technical Specifications

Model: TDA7377 Power Amplifier
Power supply: DC 9-15V/50-100W
Channel type: 2.1 stereo
Response frequency: 20Hz-20KHz
Matching speakers: 4-8 20-120W
Output Power: 20W+20W+35W
Dimension (L x W x H) mm: 605650
Weight (gm): 81g
Shipment Weight:0.085 kg