What I have now is my signal comes out of the 896 into the Presonus control station thing. Then, I have my Tannoy Active Reveals hooked up ot output A and my sub hooked to output C.
There are no controls on the Tannoy's at all. And I can adjust the Sub volume, but not it's crossover frequency. It's fixed. Of course, this is going to be the first thing I replace. My sub is still lacking in the response I want (doesn't go deep enough).
There are some trim settings on the presonus piece, so I am going to do some looking into how those exactly work. It sounds as if they are filtering something, and I know that doesn't entirely make sense, but I hear it when I turn them. This disturbs me a bit.
Do most people use a sub in their monitors? My tannoy's go down to only 75hz I believe (these are about 4 years old). Before using a sub, I had so little deep response my mixes ALL came out too bassy. Or do people use monitors that inherently have better bass response? (Like the Mackie 824s or whatever they are called).
I certainly agree that using too good of equipment isn't going to be realistic out in the real world. That problem I know is just a part of the process. My goal right now is to understand my room acoustics and then account for them. While my old method of listening to songs I knew and adjusting the response worked somewhat, those songs didn't always cover the entire frequency range. So while I'd think my bass was right, and then I'd mix. I'd find out that maybe the frequency I was using was dead in my listening position and when I played it back in other locations, the bass was deafining!

Beyond all that, this is going to be a good learning experience about room acoustics. It's something I've never really put a lot of effort into and I am thinking by putting the effort into it, my mixing skills will get better.
In any case, thanks for the massive amounts of input. Hopefully this is enough now to keep me busy for awhile
