I get voice , but no picture. I can't change channels either

as there are two different band to carry voice and picture, they are synchronized at the receiver
AS it is only on one channel , that suggests that it is the transmitter problem
Sometimes by simply moving to another channel then back will allow it t fix itself

check with your provider 'cable' to see if they made a change in your service.

Look through the settings and see what has got changed, if you can see the menu. If you cannot, show a flashlight on the TV (only if this is LCD TV) from a distance and see whether you can see the picture. Try resorting to factory default settings.

if they weren't to expensive I'd buy new ones.

lg tv can you go to main menu if yes go to channels settings and try auto program if still not then same page it have manual program go to that menu and add channels manualy and then turn off menu .by pressing menu button .and change channels

You would need to know what power your amplifier supplies at 4 ohms. In reality, you would be better off bridging the amplifer and wiring your sub in parallel to a 2 ohm load. This would allow you to pull the most power out of the amplifier. It would be safe to do a voice coil to each channel on a 2 channel amp. However, if you happen to have a 4 voice coil sub and attempted to put two 2 channel amps to it, you would have to make sure your amps are leveled. No easy feat. The variance you could have with that could damage the voice coils. But luckily, that's not your case.

It really depends on what subs you are mounting in the box. If you are mounting single voice coil subs, it's easy. positive of the sub goes to positive on the inside of the box and the negative of the sub goes to the negative of the box. Then you would repeat the process for the other sub. Then wire the box to the amp using the push or screw terminals.

Now if you have dual voice coil subs, that's where it can get tricky. You really have to know what amp your using and what ohm load it can handle, and how many channels you will be using.

I'm going to give you an example that has two dual 4 ohm voice coil subs. Let's assume you will be hooking them to a 2 channel amplifier that is 2 ohm stable.

wire the positive of both voice coils to the positive post of the box. then wire both negatives of the voice coils to the negative of the box. Repeat the process with the other sub. This is called a parallel set up. Two 4 ohm voice coils wired this way will produce a 2 ohm load. since your amp is 2 channel, you will hook the positive and negative to the positive and negative of one side of the box, then repeat with the other channel to the other side. This will allow the most power to come out of a 2 ohm stable amplifier.

If you have something other than the equipment I gave you an example of, repost with your equipment specs and I will walk you through it.

Lots of possibilities. If you are using the remote, try also using buttons on the TV to change channels. If TV buttons work, the remote is broken or perhaps try changing batteries and cleaning battery contacts on the remote. If neither work, lots of other things to try. You may need to set preselect channels, so your TV thinks there is only one channel out there until you do. If you are on a cable box you just need channel 3 and change channels on the cable box. I can't tell what you mean by "audio changes with the channel" ... if you mean that when you try to advance channels, it increases volume and moving down in channels lowers volume that would be strange -- if you are using a programable remote it might not be set correctly (try another programming code). The "blurred" picture is probably symptomatic of having the set on the wrong channel, and if you could set channel it might clear up ... I'd start with getting channels to change. If you need more help, give the brand and model of TV, say if you are using a remote (original or programable), and what the 'audio changes' comment means in more detail. Probably worst case is that your tuner circuit is fried, but don't assume that without more diagnostic.

I turn on my DYNEX LCD-TV model DX-L26-10A and the screen says 'Please Wait" for a few seconds and then I hear the voices for the channel, but there is no picture and there is a buzzing sound coming from the back of the unit.

if you have comcast you can use your remote to change the tV program from cabke to DVD then change it back to cable. your image should come back.