[Wayne A. Pflughaupt]

Thanks very much for the kind words, Marc.

If you can believe it I actually once ran through both channels of the BFD for a single sub just so that I could access more than 12 filters. I mean heck the line kept getting flatter so it must be better right?

Did you hear about the guy who bought a second BFD and daisy-chained them both so that he could have 48 filters to work with?

Just kidding. Gotcha!

On the other hand, I have concerns as to whether that means one sub is working much harder than the other over the majority of the spectrum, making the second sub just a "gap filler" for where the first is weak.

No, one is not working harder, at least not now, because they're both getting the same electrical signal. Keep in mind that the greater overall output from the "green" sub is coming from boundary reinforcement. IOW, it's getting the extra gain for "free."

Something tells me it should be better if they were each flat individually around 69-70dB and then combined to still be flat at 75dB.

Now, if you do that, then the "red" sub will be working harder, because you'll have boosted its electrical signal (via EQ) to make up for what the other is getting for "free" from the room.

One of the main reasons I wanted the second sub was to reduce the load on my existing one and I wonder if this global EQ approach has really managed that at all?

Well, you did mention that you realized 6 dB in overall gain, so it looks like you've indeed bought yourself some extra headroom. You're doing better in that regard than I did when mine were seperated, pretty much like yours with one by each front speaker (L/R), with the right one being in the corner. When I finally stacked them both in that corner, I was surprised to see that I got a 6 dB gain. Well, that's typically what you get when you have a single sub and add a second. IOW, when I had them seperated, the one that had been out of the corner wasn't contributing anything, SPL-wise. It was just providing "air pressure."

Thanks for your interest and suggestions. I'm really glad you brought up the global EQ specifically as it just proves there's always more to learn and more to tinker with.

LOL, you're going to burn so-o-o much time you'll probably end up throwing darts at my picture instead of thanking me! Well, at leasts its fun and easy now with REW - wasn't the case way back when I was running all those sine waves and plotting my charts on graph paper!

Oh yes, and I'll follow the rules for posting charts next time too, my bad on that one.

Well, your scaling is fine, but you're going through a lot of trouble doing them as screen shots. See that little "save" icon in the bottom left-hand corner of the graph? Click on that to save the chart as a jpg.

Regards,
Wayne