Originally Posted by turboman123
What about the level. The around 80dB is Ok, but headroom for front was 50dB, which is not according to guideline. Noise floor was 60dB.
Nice progress, Turboman! You have received some good advice from Keith and Jkasanic. Regarding the 80dB question, I assume you mean you calibrated the microphone for an 80dB level, which is fine. However, when you do the measurement sweeps, the headroom should be much higher than 50dB, if that is what you mean. So, just testing for understanding, on Step 9 of the mic calibration (p. 47), there is a screen that shows the maximum SPL that you can measure. What is this value? Is it in the 90-120dB range as the guide states?
I suspect there is still something amiss with the mic calibration, but you are still getting useful measurements, so we can address this further after you answer my questions.
I agree that the sub placement in the center looks better, but I also think there is a lot of room for improvement. IIRC, you have only one sub, and even by finding the best spot for one sub, I predict that there will still be some unevenness to the frequency response below 100Hz. If you have the space and the budget, my recommendation would be to consider a second sub, ideally one that matches your current sub. As you may have already read in the countless discussions of achieving smooth bass response, having at least two subs is probably the most important step. The order of priority:
1. More than one sub (matched, if at all possible).
2. Careful placement of the subs using measurements.
3. Room treatments to address issues placement cannot correct.
4. DSP room correction (sets proper delays and trims, irons out remaining response issues).
And finally, there is no "correct" set of measurements. The important point is to learn how to use which measurements to analyze specific problems in your listening area. For example, a good starting point is a set of measurements as I listed in my last post. If, for example, the Left+sub or Right+sub exhibits choppy response in the low frequencies, then a second set of measurements that isolates the Left main and Right main speakers without the subs, and a measurement of the sub only, allows you to analyze whether it's the mains or the sub that is largely responsible for the response issues. Being able to select the right measurement for a specific issue is a sign that you have progressed from being an REW novice to a journeyman, like the rest of us. Expert status takes a few more years....