I haven't been in another Z with non-stock speakers in it compare. I think the high and low range is great, but when I listen to - dare I say - Rap (which is extremely rare) there is a substantial difference in the amount of bass coming from the 6.5s in the back, but with a good equilizer (like the Alpines) its easily corrected by directing the fade more towards the front of the car, which then really lets the 4X6s shine. But all in all I think it sounds great, and that's all that really matters ;-)