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Question: I cannot use an Optical Audio (digital) output from my TV to the580.  Will an  analog audio (RCA connectors) input sound as good?
Document: I won't repeat what others are already saying. The ZVOX is simple to set up and improves the TV sound greatly, but it is not as great as you would come to expect from the reviews. Having said that, it delivers very crisp sound, not much bass and it really enhances dialog.Here are some caveats that I found:1. Use the digital audio connection rather than the analog one. It greatly improves the simulated surround sound2.
The  best part of the ZVOX is ease of use. It took about 5 minutes to program my cable remote to control the ZVOX sound volume and mute. The external Sony TV speakers are turned off. The ZVOX becomes the TV sound and we enjoy the one remote system. I only use the ZVOX remote for surround sound and base and treble adjustment. I have a digital optical cable from the  TV to back of 580. Also appreciate the front input for my ipod.
We have a 7.1 home theater system in the basement, but some times we like to simply watch TV in the family room. We have a flat screen that has a great picture and so-so sound. The ZVOX 580 connects with a Toslink optical cable and was delivering great sound within five minutes of opening the box. You can also use analog RCA jacks.[... ]Dialog is much clearer and the sound makes our favorite shows more engaging.
Neither of these cables is included in the box. The RCA cable that is included in the box should only be used until you get a cable for one of the digital inputs assuming your TV has the corresponding digital output.The surround sounds modes work well at creating a larger sound field but as I said don't expect the same results you would get from a real 5.1 home theater system.The dialog emphasis mode punches the dialog through by reducing the sound track while increasing the voice frequencies.
I wanted a sound system that would provide loud clear sound for movies that we stream to our HDTV via the Roku 3 from Amazon. We were using a nice stereo system but when we switched to the Roku 3, it no longer had audio outputs and we would have to use the optical output from the HDTV. I could have bought a converter but decided to move the stereo out of the room and simplify everything by getting the ZVOX 580.
I strongly suggest you get a digital Optical cable for the TV connection, regular audio for another connection Blue Ray, and WOW connect a Ipod/ipad to the front port and you could blast the house and the neighbors with your music.The sound; strong base and at half Vol you will feel the thumps in your chair. The Dialog Emphasis feature allows for bringing in the vocals over the SSound when watching a reg TV show.
It worked right away and very simple, just plug in an optical cable to the HDTV and plug it into the ZVOX 580, turn on the power, select the input and done. I like that the display hides when not in use and is large and clear enough to see from across the room. The ZVOX 580 is optimized for voice clarity and not music. While it does sound good playing music, it is not comparable to listening on high end speakers.
In fact, I would recommend this as a nice low cost hifi system for anyone. After all it has two analog inputs, two digital inputs on the back and an additional input on the front. The rear inputs are switchable from the front or the remote. For less than $500 this would be a hard system to beat as a stereo. One complaint, the high end is a little directional. As you move your head off axis, the sound changes in the high end.
I could not get any sound at all. The problem was that with the Pioneer, the tv was engineered to not allow any signals being received by HDMI cables to be passed through the optical output. The guy that I talked to at Zvox was great. He actually found a manual for my particular television on the internet and downloaded it. From there he helped find the problem. I had to hook it up via the analog cables.
Small changes in distance from the wall made noticeable differences in bass responce so a little time here pay big dividens. Good treble response and midrange as well so far so good. For the record I am using the optical output from my 64" Samsug Plazma 3D TV to feed the Zvox it's signal. With a good Blue Ray movie I am very impressed with the sound fields this bad boy can create and it can certainly shake the walls if needed.
Answer: No. If you 've never heard the difference no loss.  Once you do go digital you won't go back the saying goes.  When you upgrade to a smart tv you will be all set.  By the way it does sound awesome for exactly what it is.  A quality box.