Absorption, Diffusion or a combination of it all?

@audphile1 

I would suggest a consultation from an acoustician. Jeff at hdacoustics is very good. Duke LeJeune recommend him to me. He can analyze your room for you. He designed my room and it turned out amazing. Good luck !

Perhaps I'm a purist. I want to hear the recording the way it was produced and intended to be heard.

Compressed and with a sizzling treble for ear buds/car radio playback? I think a lot of recordings are engineered with the lowest common denominator in mind.

i beg to differ on an all absorptive room sounding terrible.

Really?  You have a room that has no reflections, and is 100% covered in absorption materials?  @ronboco 

@erik_squires 

Hi Erik. That is mostly correct. My room is right on the edge of small to medium so my acoustician designed it to sound bigger than it is. There is no drywall in the room. The walls behind the speakers have Rockwool in between the studs and 1/4 inch pegboard over the studs so there is probably some reflection there. All the other walls have Rockwool then pegboard then a layer of 2 inch rigid fiberglass over the pegboard. The ceiling has Rockwool in the joists and two layers of pegboard and 2 inch rigid fiberglass. The outside of the room is 1/2 inch drywall then a layer of mass loaded vinyl then  another layer of 5/8 inch drywall. All cracks have been caulked. I put some pictures on my systems page. I have been very happy with the result. I enjoy having people over with more listening experience than I do to critique my system. 

You will need absorbers and diffusers for certain. Just look at my house of stereo. Too much work involved to put it in a post and it's all room dependent anyway. Keep at it, you will make mistakes, persevere and you will be glad you did.