They are 5 1/4 rear and 6.5 up front. I have two 10" Orion HCCA's on 2k. It overpowers the music regardless. But you would be surprised as to how much mid bass the 6.5 Type R's put out in my doors. My wife drives the car too and she keeps the subs down. So for her sake I would like to keep the music as full range as possible for a richer sound. I hear you though too and that's why I asked the question to begin with. I wanted to get more volume out of them by raising the x-over point but still keep some mid bass. I just wanted to know where that piont should be. After researching I don't think there is a set answer and it's subjective. So I've been playing around with it to see where a good balance of volume and mid bass is. I have found though that if I turn the x-over to about 100hz front or rear that yes I get more volume but it doesn't sound very good. It's almost distorted. Before this I have been running full range rear and full range front utilizing the built in passive x-over that came with the components and I think I'll just keep it that way. I would rather have richer/fuller sound rather then louder distorted sound. Same with the wifey. I don't know why it sounds so bad when the x-over is up but oh well.