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Since I was mentioned in this thread, I suppose I should comment.
First, a couple of quick comments on the radios themselves. If a radio was converted 4 or more years ago, that's fine, but it is no comparison to what's available now. I worked with a design engineer in Detroit, and introduced the Aurora FMR Stereo Receiver. Prototype #1 was a vast improvement over the former types, and I haven't looked back. Since my purpose here is not really to advertise, I'll finish the comment by saying you can find me on the web if interested.
Classic Auto Sound -- I assume you're referring to Custom Autosound. I picked up their line because I liked the speakers, but their stereos used to be mediocre at best. They have vastly improved over the past few years and today they're a good option if you're on a budget, or looking for the digital display with bells and whistles.
Retro Sound came about as a result of Custom Autosound's vendor. When the USA-630 was introduced, they tried several in the lab and found them to not be reliable. They rejected it, and had them made by someone else. The first vendor jumped the gun and had some 5,000 of them built. To unload them, they began calling dealers saying they could offer USA-630's for less. Yes, they called me. Big lawsuit, these guys could sell the stereos but the logos had to come off. Someone bought them and became Retrosound. Of course those 630-clones are long gone, and I cannot speaker for the quality of their current products.
The "Dual cone speaker" is ambiguous. There is a Dual Speaker and a Dual Voice Coil speaker. The Dual is two small speakers mounted together. The Dual Voice Coil is a fill size speaker with two voice coils. Most have two tweeters. The DVC is the better choice because it's a full size speaker. If you have one of these in front and another in back, connect both left channels to the front and both rights to the back -- you'll have full power and full stereo effect.
There are other options. The Undercover speakers fit under the seats. They sound really nice, but won't fit if you have power seats. Another product is interesting -- the "System." It is a powered system with two satellite speakers and a subwoofer. The idea is nice, and long overdue. However the satellite speakers look like small A/C vents, and mount under the dash. I asked at the time, why do this? Why not have them fit in the original locations? Mike (at Custom Autosound) said they're working on it. Meanwhile he retired. Oh well. HOWEVER, I have one here and one day I'll install it. I have power seats, and I think these satelites will fit underneath. Haven't had the time to install it but if I like it, i'll promote it.
Hope this gives you ideas.
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