Quote:
mpompey wrote:
 I think I got it. I raised the gain knob on my sub from a quarter turn to about a third and remeasured with REW. Here are the graphs of the initial (unfiltered) response and then the final one with the filter. (This is with a 5dB house curve from 30 to 100Hz)
However, after I applied the filter and checked the level of the fronts versus the sub with Avia DVD, the sub was about 4 dB lower. So I raised the gain knob on the sub to just shy of halfway and the levels matched. Did I do that correctly? I didn't think I needed to touch the signal from the receiver, as to that would mean I would need to REW the whole thing over again.
Here are the graphs: |
Yes, you did that correctly. After eqing the sub, you need to re-calibrate the sub's level.
But looking at your "after" graph, it looks like you could still use some more tweaking. Did you use REW's "find peaks" and the "suggest filters" and "optimize filters" options? Ie., some if your cuts are in the right spot, but could be widened (bigger bandwidth) for a larger bandwidth.
I think I've configured my BFD filters 6 times or so before I settled on my current filters.
For example, it looks like you put a cut at 58Hz, but it's pretty narrow so it leaves some humps on either side. Same with the cut at 20hz, although you probably don't even need that. Depending on the final level/graph, you could widen the filter, raise the frequency it hits a little, not cut it quite so much, and smooth that out. You might want more of a house curve, so there's more boom down low compared to the 40~80hz range.
Keep experimenting and you'll hit a combination of filters that really make it smooth.
