Originally Posted by jbrown15
Yes but this measurement sweep was taken with my AVR master volume set at like -30 from two subs, the first graph while scaled incorrect was with my AVR at -10 if I recall. I'm not even pushing the subs yet. The first graph was not a max SPL sweep. Take away the null at around 68-70hz and that's a fairly flat graph with very little EQ work on my part to flatten it out. From 60hz down to 10hz there's only about a 7dB difference. That's not bad, I need to get my miniDSP setup and running before I can't really dial everything in. Both of those graphs were with 1/12th smoothing also.
I know the first graph is scaled incorrectly because its increments of 20dBs and the second graph is 5dB increments, but the two graphs both show the same thing, one is just stretched out more from 10hz-30hz.
The first graph uses the correct logarithmic scale on the x axis, the second one is not using a log scale. There is a simple fix...just reopen the first REW measurement, scale it properly, and re-save the image.
X axis log scale 10-200 Hz
Y axis 85-145(60 dB spread at higher level)
Oddly scaled graphs, which both of those are, make it difficult to get a clear visual representation of the FR
Its not the issue of 5 or 20 db spacing on the Y axis, it is too large of a total spread which makes the FR appear much smoother than it should be. A 60 dB total scale results in 5 dB increments....but if you had a 0-200 dB scale in 5 dB increments, it would still appear overly smooth.