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Well it's only my approach but it seemed to start working for me when I got hold of some very flat speakers (monitors in my case) and positioned them close enough to me that the room effect lessens. At the same time trying to get them away from room perimeters. It's been a long journey for me though, lots of money spent, lots of fun regardless. I have accepted that speakers need to be away from the back wall or you need to reduce the bass, wall and corner you need 6db reduction in the bass.
So basically try and create a triangle where your listening position is roughly as far away from the speakers as the speakers are from each other and get them away from the walls, then you are hearing the speakers less than the room. In my room there's one point where it's pretty flat, in some corners the bass is 6db or more higher, really noticeably booming.
I agree with you and your friend that DSP could work in this system though. I do use it myself depending on the speakers and positioning, its also very useful if you are running a sub.
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Airhead
@freddo
When I installed the the audio system in my van (5channel, 4 way high-end components) I did something very similar with parametric eq profiles to tune and shape the sound at the pre-amp stage. Obviously you have to do this in a car as you can't shape the room in any meaningful way.
In all seriousness, it was recommended to me by someone with something upwards of a £50k hifi setup who used one to create an eq profile for his room because "the room is always an issue". Given that any set up is always going to involve trade-offs (I'm not going to install bass traps or put my speakers in the middle of the room) there's no reason that a custom (to that room) parametric eq profile shouldn't play a part in improving the sound arriving at my ears. If you read the audiophile reviews, literally everyone raves about this device: here, here, here, here...
Otherwise, what should I adjust? Sure, I can spend £hundreds on new feet for my speaker stands (sadly that's probably going to have to happen), or I can upgrade the speakers and still have problems (these speakers are plenty capable of the quality that normal ears like mine will fall in love with if I can get them to deliver ).