I am sorry if I again ruffled some feathers etc. I have been a long time factory radio hater. But I've owned a lot of cars and heard a lot as well. My first car had a junk(1981) $35 aftermarket cassette deck. I installed just a pair of $50 Pioneer 5.25" door speakers, and a PA200 amp. With speaker level inputs the radio maxed out at just under 90 degrees of the volume knob, yet the knob would turn almost one revolution. The relatively poor signal was good compared to stock radios, at those low volume outputs. The 30w/ch amp with .003% distortion created more volume than any factory radio, and was very clear. No sound of any kind could be heard for about 30 feet, it was more than loud enough.
The point is simply that factory radios usually have so much distortion that full volume isn't very loud, plus it doesn't sound good. A high quality amp can make any radio sound great with decent speakers, at max volume.
The price point where aftermarket radios get no better to spend more, is dropping. What years ago took $400 to reach a level of quality, you can buy now for under $150. I don't believe much sound quality is gained now to spend more than about $200, beyond that now only gains bells and whistles.
Thus when I tossed out the $400 mark two days ago I really should have estimated $200. Okay, now let's agree that we want better sound, and talk about something more important. The Mach and Premium radios can equal any under $200 aftermarket radio for basic listening sound quality. To gain more volume just add a high quality amp, etc. Regards,