This part is a kind of semiconductor called LA47515.

Function of this product has Power Amp.

Manufacturers : ETC

Image and pinout :

Some of the text within the PDF file :

Part No Information Note Block Diagram LA47515 (01IC301) Power amp. Pin Function Pin 1 2 3 AC CONT1 GND1 OUTFR- Label I/O Header of IC Power GND Outpur(-) for front Rch Description Free Datasheet http://www.datasheet4u.net/ 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 STBY OUTFR+ Vcc1/2 OUTRRGND2 OUTRR+ VREF INRR INFR SGND INFL INRL ONTIME OUTRL+ GND3 OUTRLVcc3/4 OUTFL+ MUTE OUTFLGND4 AC CONT2 - Stand by input Output (+) for front Rch Power input Output (-) for rear Rch Power GND Output (+) for rear Rch Ripple filter Rear Rch input Front Rch input Signal GND Front Lch input Rear Lch input Power on time control Output (+) for rear Lch Power GND Output (-) for rear Lch Power input Output (+) for front Lch Muting control input Output (-) for front Lch Power GND Header [ ... ]

LA47515 PDF Datasheet Download