I agree with Bob. Get a decent sub and set your mains to cross at about 80hz (I know. It seems like you're not getting your money's worth out of your speakers. But it's the right thing to do.)
You'll get much more clarity and soundstage info.
I, like Bob, don't obsess about linearity measuements. I have (thus far) integrated a SVS PC Ultra 13 with my Martin Logan Aerius I's by ear with wonderful results.
My most recent tweak was to put the sub on sorbothane pucks to take the floor and walls out of the equation. I'm hearing the sub and not the room. If you can pinpoint your sub, it's too loud. And a good sub can't "create" bass info that's not on the recording in the first place.
Take a look at the SVS stuff for "bang for the buck".
You'll get much more clarity and soundstage info.
I, like Bob, don't obsess about linearity measuements. I have (thus far) integrated a SVS PC Ultra 13 with my Martin Logan Aerius I's by ear with wonderful results.
My most recent tweak was to put the sub on sorbothane pucks to take the floor and walls out of the equation. I'm hearing the sub and not the room. If you can pinpoint your sub, it's too loud. And a good sub can't "create" bass info that's not on the recording in the first place.
Take a look at the SVS stuff for "bang for the buck".