Originally Posted by mikela
Having a well designed acoustically treated space prior to room correction is the best approach. If you don't do that you will likely forever be adjusting the music to make up for deficiencies in the room. I believe most folks here use multiple subs utilizing the multiple sub optimization (MSO) technique in order to even out the response. I use a different technique called single bass array (SBA) which is described in my build thread.
You can still find a need to adjust music to make up for deficiencies in recording standards (i.e. "circle of confusion") that are less applicable for movies. Or older recordings that were mastered to the old RIAA standard and have significant bass rolloff below, say, 60 Hz.
I think we agree that a pre-engineered, acoustically treated space as you, Lon, Art, Steve, Jeff, and many others have done is indeed the platinum standard. However, not everyone can pull that off.
That being said, there are common "stuff of life" treatments you can do - carpeting to reduce floor-based reflections, bookshelves that diffuse sound, thick curtains to cover windows, along with multiple subs, thoughtful LCR speaker layout, and careful seating placement that can compensate somewhat with measurement and iterative A/B critical listening to look at all these. There's also combinations of absorption and diffusion that can mitigate some room issues with refinement. In fact, the HAA class I took last summer took a cheap hotel room with windows and simple drywall construction and produced superior sound based on their critical dimensions for listening: clarity, focus, envelopment, smooth response, dynamics, and seat to seat consistency, using many those techniques (among others). Trinnov has embraced the HAA philosophy as a requirement for dealer certification in the future, and just finished a training session with HAA in Paris over the July 4th weekend.
But for multiple rows and seats, and more importantly room dynamics for high performance HT, as a wise person once put it, "bring money" to get the results that, say, you have. No substitute for that. Yet you can get 85% of the way there with knowledge and knowing where to spend.