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I thought the point was to get it close to the SPL target.
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Most users like the sound of a small house curve. If muzz had added a house curve it would have tracked quite close to it. He got it without even trying.... If he didn't want a house curve and he indeed wanted the target he shows, then he would need to bring his response down to meet the target.
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Do you just plot a curve and try to be as close to that curve in terms of drop-off as possible. Then when you get rid of all the peaks, you recalibrate the system (mains, center, sub, rear) to 75db across the board with the EQ on using the pink noise from the receiver. The trick being you use the level on the sub to turn it up and down versus the adjustment on the receiver.
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You're placing too much emphasis on the exact 75dB number. It isn't really important. The idea behind all this is to equalize the peaks out of the sub. That's it.
It's
convenient with REW to use 75dB as a center point. The object is to get rid of the subwoofer response peaks. Once that's done - set the level of it and any speaker to whatever you like.
Generally (once you've eq'd the sub), then the level you set the trims and subwoofer to is controlled by the receiver test tones. You try and match them. Doesn't matter what the actual SPL level is. Could be 81.66dBSPL - as long as they're matched. Some people like the sub a bit hot, so turn up the sub amp a bit.
brucek