HTS Senior Moderator
Just mark where you are now so you can go back to it. If the seating is limited and forcing an issue that you can't resolve by moving, the speaker position may be the best you can do.
So apart from the decay time I take it this is a pretty good response that I have achieved, in other words no problems that I would really be able to notice?Well, after all of that, it appears to me that you were correct and you're in about the best place you can be. Not seeing any of those that are better -left and front don't have the dip at 120Hz (and/or it's moved to be either higher or lower in frequency as the graphs show).
At this point, the 120hz really isn't all that bad and appears to be from a multi-dimensional mode. I would concentrate on getting the decay times more under control.
Sorry when you say the wide dips you are talking about the response from the sub in my wifes favourite position (#125) not the one above that (#123)?The 120 likely won't be too noticeable. The 190ish is pretty deep though very narrow.
The front orientation has a couple of pretty wide and deep dips that would make it sound much thinner and much less slam to it in my opinion.
Getting the decay times in line will help tighten things up and provide more apparent extension along with better dialog clarity.
Oh well, she will have to stay unhappy :devil:Correct - the front position that's preferred by the wife in #125
I figured the bare wall behind me should be my first port of call, with some diffuser panels spread out across it, I can't afford to do the lot yet so I'm prioritising, would this be the best place to begin?You can try to EQ up the 120Hz as long as it's not modal in nature. The other one, I wouldn't worry about too much. Like I said, it's pretty narrow for as high in frequency as it is.
Treatment is definitely the way to address decay times, reflections, etc.
Thanks Bryan :TIf that close to the wall is the best response, then I'd leave them there. Not optimal but there are always tradeoffs. Eventually, you'll want to address those close walls with something absorptive to catch the very early reflections.
Broadband bass control is usually the best place to start. Having the speakers that close to a corner limits that location though. Next best spots would be front wall/floor junction if there is space, over your head if the ceiling is 8' or less, and center of the rear wall.
I was always under the impression that rear wall should be diffuse not absorb?There is a chance that bass absorbers behind the speakers will help. My guess is not in your case but you can certainly try whatever you get for the back wall there as an experiment.
Ideally, front corners would go floor to ceiling.
Rear wall - 4-6" thickness - 3 2'x4' panels would be good.
Ceiling - at 8.5', likely it's not going to be a big problem with height modes so you can skip those.
I sit 3 feet from the rear wall and I have bipoles to my left and right that I would have thought needed to use the reflections off the back wall, I would have thought the absorbers would stop the full effect?There is a lot of misinformation out there. There is no one right answer that works for every room. Diffusion can work IF you don't need to address bass issues from that location, you can get enough other bass control in other places, and you can sit far enough away to make diffusion work properly. Diffusion that will work down to 300ish Hz requires for the most part that you sit a minimum of 5-6' away from it.
Ok I will stick to the corner fitting bass traps, there are quite a lot of varieties with different frequency range absorbtion, is there anything in particular I should aim for?Having the bass absorbers flat on the walls will limit how low they will reach. It will also require double the expense to cover floor to ceiling. It's doable, just not optimal.
On the rear, the dipoles are higher up. The absorbers would go from say 2' to 6' off the floor so the upper area where a lot of the reflections are is still open and could use diffusion.