My MOBO is ASUS M4A88TD-M EVO/USB3, There is 7 audio interface port to connect, as shown below 1) Now I want to know which Brand/model speaker is supported Optical S/PDIF_OUT PORT. 2) Which Brand/model speaker for 6, 7, 8, 9, 10, port ? I mean speaker direct connect to MOBO rear port, not through Ampelefire. Is there audio sys to connect these port without amp ? As per MOBO's Manual 6 for Center/ Subwoofer 7 for Rear speaker 8 for line in port 9 for line out port 10 for microphone My actual quasion is here Suppose a 5.1 speaker set connection from rear of MOBO, first I connect subwoofer to no.6 port, rear speaker for no.7 port, but there is onther problem generally 2 speaker for rear, how can I use this single port for 2 rear speaker ? Than how to connect other speaker ? If it is not for these connections than why mnf of MOBO given these port e.g. no.6 for subwoofer ? My current speaker Logitech Z623 is from no.9 port & working wel.