Originally Posted by Gary Warren
I don't have an SPL meter. How much does an SPL meter cost and where do you get one? I can look on Amazon, what quality do you recommend? Radio Shack or do I have to go better? Any ideas? Can this be done using the quick measure feature built into ARC, rather than to buy one?
Gary, I believe you do have a probem. Your levels are way out of whack. Why should every speaker be boosted? They should only be for equalisation. Some in the --ve and others in the +ve.
There is something wrong in your measurement. The ARC measurements are quite sensitive. Slight changes in environment can yield radical results. I ran ARC a second time after a power amp and sub upgrade. I ran it twice for 2 profiles (2nd one being 2.1, unnecessary I know), and despite using similiar positions, the sub levels and room gain settings are different.
The measurement can be affected by things like background noise, such as fridge or other appliance. Looking at the graphs for your fronts, its liek flat all the way down to the subsonics. Something isn't right here.
I was combing through some of the threads regarding setups, and one of the problems identified is wall reflection from speakers placed too close to the backwall. The ARC mic will read that extra bass gain and dampen down the bass response, all the way to LFE signals. Looking at your graphs, this might be the case. Its not a case of low sub volume, its that little signal is sent to the sub and bass drivers.
You have great floorstanders, but they still roll off around 45Hz. That's just how floorstanders are. They have no right to be flat all the way.
And forget about room gain. Its an unnatural "boom" added to the curve. Increasing it will only lead to unnatural bass rolloff. Speaking from my own experience, when I had that initial run with 2 configs, sub level was -6.75 and room gain 3.25, config 2 -6.25, rg 2.2. Go figure. Redone it this time, and as I have a small room, I clustered the measurements as close to the minimum required 2 feet. Guess what, sub level is -5.5, rg 2.5. I get a smoother, stronger bass. Can finally run in my KK sub properly!
So I believe you, there is something wrong with your ARC setup. Bear in mind ARC is only as good as the measurement, and in science, you never measure anything just once.
Why don't you post your raw ARC file here and we can look at it in more detail?