I currently have a yamaha sub (55 watts) from the sub output on my yamaha receiver (HTR-5450). But I have another xtra TEAC sub (250 watts) and I'd like to add some more bass. Can anyone help me how to run the second sub from the receiver??? My receiver have SPEAKERS B available, SPEAKERS A are for my 2 front. PS: my TEAC sub only have 1 RCA plug input. But my yamaha sub has RCA input, 2 speakers input and 2 speakers output. Thanks for your help.