[roger1]

Originally Posted by ZeGermanHam

Roger, I recently ordered that 4x10" RetroSound speaker for the dash of my '66. If you're curious, the real-life bottom mount depth of it is about 2-1/32". That's a little less than the published numbers, which is a good thing.

I know it's apples to oranges, but the factory original 4x10" speaker that I removed from my '66 with A/C measured at about 2", so the RetroSound speaker should work for me. Hope it does for you as well. Like you, I am pairing it with two 6x9" speakers - Alpine R-S69.2 R-Series in my case. I have bench tested all of my speakers, and the RetroSound 4x10" will be great for providing front fill when used in conjunction with other speakers. It gets plenty loud, is nice and clear, and I think you will like it. It doesn't have much in the way of bass, but that's what the 6x9s are for. You will get better sound quality out of this speaker than you would have with the previous one that didn't fit, too, so I'd consider it a happy accident.

Thanks. Good to know it sounds good. I'm pretty certain it will fit but I think I may have to fabricate a bracket to hold it in place but that's not a big deal for me.
Those Alpine speakers are capable of high power. Are you going to use an amp with them? If so, are you going with a 2 channel amp or 4 channel to connect the 4X10 too?

Originally Posted by vertigto

I went with JL Audio's dual 3.5" 4x10 replacement speaker recommended by Classic Car Stereos with the bracket for AC cars they say is necessary.

https://www.classiccarstereos.com/jl...-90-watts.html

Will be interested to hear how it sounds with my Hermosa and 6x9 C2 JL Audio rear speakers.

Have you test fit the front speakers yet? If your '70 is the same at the dash as my '69, I think you may have a duct clearance issue like I did. My understanding from talking to Miguel at Classic Car Stereos is that they buy the mount from Custom Auto Sound and they have Custom Auto Sound speakers installed. Then Classic removes those and installs better speakers like the JL Audio you chose and the Kicker that I chose. However, the speaker change can affect the fit in the application Custom Auto Sound designed them for.
Anyhow I hope yours fit OK and you don't have to send them back.
Same question to you too. Are you going with an amp? If so I would think in your case you would go with a 4 channel to power all 4 speakers.