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Yes you can get simulated 5.1 surround sound from your TV as well as radio. Just switch the JVC surround mode to Pro Logic II movies or music In some systems it will display only PLII. Just connect the TV audio out to the JVC Aux input at the back ( red and white sockets ).
They're passive speakers and the sub jack only puts out LFE Line Level. It's to drive an amp that drives a sub. Besides, it's a car speaker and needs an enclosure to separate the forward sound pressure from the rear sound pressure or it will partially cancel itself out.
In the setup menu are the speakers set to large or small? On some receivers if you have it set to large all the bass is directed to the right-left fronts. On my pioneer receiver if the speakers are set to large the sub-pre-out only works if the receiver is in a surround mode, if its in stereo mode and the speakers are set to large the sub-pre-out is dead. If the speakers are set to small the sub-pre-out works all the time. Also, some receivers won't send a signal to the sub-pre-out if there is no LFE discreet signal info from the dolby digital or dts bitstreem. For example I have several older dvd's that light up the L C R SL SR icons on my receiver, but don't light up the LFE icon. I have other older dvd's that just light up the L and R icons meaning they are only recorded in stereo like a vhs tape recorded in dolby surround. In my basement I also have a kenwood dolby digital receiver. I've noticed that when a dvd only lights up the left and right icons the pioneer will automatically switch to dolby pro logic surround. The kenwood will only send the signal to the left and right fronts (stereo). If I manually switch it (kenwood) to dolby pro logic I'll get sound from all the speakers just like the pioneer, but it does'nt do it by itself. Most receivers that have a tape monitor won't work in surround mode with the tape monitor on. The pioneer will let me use the tape monitor with dolby pro-logic but won't pass through a dolby digital signal with the monitor on. Hope this helps.
Unless the TV has an output for Dolby Digital, you can only listen in stereo or a pro-logic modes, or other none digital mode. If you only connect 3 of the 5 speakers, then the other two channels will simply not be heard, but it shouldn't damage the amp.
You will need an amplifier or 2 channel receiver. Hook the sub out rca jack to the rca inputs on this new amp or receiver and hook the speaker terminals on sub to speaker terminals on same amp or receiver. Your Yamaha receiver doesn't have any power for a passive sub.Just pick up any old fairly high powered receiver for fifty dollars and you're good to go.I use old dolby pro logic receivers as they are a dime a dozen today. Good luck.
Try using front pre out to the sub from the receiver. the crossover is in the sub anyway. If this works change your settings on the receiver and test again. If sub is still inop, could be an internal issue with the sub amp. Does your sub amp have an on/auto/off switch or light? check that as well. Hope this helps, if you need further assistance, send a reply and I'll help some more
When you are playing cd,s set your amp to stereo and the sub should work,prologic should never be used for playing music as this destorys the sound stage,if you are useing small speakers make sure you have set the size in the setup menu and the cross over to about 80hertz.