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| brucek wrote:
For your graph, please use a vertical scale of 45dB-105dB and a horizontal scale of 15Hz-200Hz.........
Use a 75dB target and set REW up for 75dB........... |
Bellow 45dB and after 250Hz is where my subwoofer begins to cause reverberations problems in my room according to the RT60. I thought it may have had relevance to the filters that I am applying there at those peaks. I will not post images in the scale of 45dB-105dB and a horizontal scale of 15Hz-200Hz but I thought it may have been an issue to discuss later on.
Quote:
| JohnM wrote:
5dB would probably be a closer target level for that trace. Also when adjusting your filters check the box to "invert filter responses" and adjust the Q and gain to try and get the filter response to overlay the measurement, that will give the flattest corrected response. From the corrected trace in that plot it looks like the filter Q/BW settings have not been adjusted. |
I forgot to adjust the Q and gain. I did the BW adjustments. Not sure about a 85 target. Sound and Vision has this to say about the subwoofer.
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Bass limits for the THX-12SUB subwoofer were measured with it set to maximum bandwidth and placed in the optimal corner of a 7,500-cubic-foot room. In a smaller room users can expect 2 to 3 Hz deeper extension and up to 3 dB higher sound-pressure level (SPL). The only response difference between the VAR and THX settings is that the latter reduces levels by 9.5 dB. In either position the subwoofer has useable response up to 250 Hz, where it measured -6 dB. Dynamically, the THX-12SUB will deliver 106 dB SPL at 32 Hz or above, which is better than average.
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I usually have peaks around 115dB around 60Hz currently without any equalization applied. This may be something I would try after applying filters, but certainly not something I would attempt otherwise. I will see what I can do about the target later. I have tried a 85dB before but it was overloading the subwoofer.
If I am doing a 85dB target then by the time I am turning my Polk mains up to match, they began to making pop noises. I don't want to overpower my speakers or clip my mono amps, whichever that may be.