Hey:
Well, I guess the speaker in the back is the Sub woofer. But I would think it would be a little more pronounced, but guess not. The volume does go down, minimally, not even worth noting. My Astro did a great job of keeping up with the speed, but this one seems sorta low volume. I was just wondering if anyone else noted these little quirks. Now, what kind of radios are these and wonder if there is a service manual for them.