Originally Posted by nith
I've read through most of the posts, but just want to concretely understand it all. A little confusing for half-wit like me.
1. Connect one sub [footnote 1] to the receiver and place it in the middle of the room, stick spl meter 4" away from the center of the woofer.
2. Use receiver test tone [footnote 2] to measure the spl to 75dB, adjust the gain on the amp accordingly to reach this 75dB.
3. Disconnect the first sub, repeat step1 and step2.
4. Place the subs to their home destination.
5. Run auto calibration tools such as Audyssey.
[footnote 1]: How to place mic if the sub in question is Submersive or JL F212.
For my Submersives, I place the SPL meter 1 ft. away from the middle of the "front" of the sub, (the front being the side with no driver.) For the F212, I would probably go for the point between the drivers.
Originally Posted by nith
[footnote 2]: The gain on the receiver must be at , corrrect?
That's were I start, but see further detail below.
Originally Posted by hometheatergeek
I place my SPL 2 feet away, on a tripod about 2 feet off the floor. This will work with all types of subs whether ported, sealed or dual opposed subs. NOTE: With dual opposed subs it would be setup where the sub has the drivers not
facing the SPL meter.
What I do is run Audyssey or YPAO first without any sub on. This will set the 5 or 7 speakers to reference  first. Then place sub in middle of the room, turn on the pink noise, select the left channel (because this is usually the first speaker to play the pink noise), now turn up the master volume on the AVR until the left speaker is outputting 75dB, turn on the sub and switch the pink nosie so it is outputing the Sub channel, in the AVR, and adjust your sub volume knob until it reads 75dB.
correctamundo for steps 3 - 5
I don't bother with the speaker levels at the point where I'm gain-matching the subs. Do you feel there is benefit in that? If so, I'll try it. I should be receiving my Integra DHC 80.2 on Monday. I'll need to completely redo my setup to integrate Audyssey MultEQ XT32, so that will be a good time to experiment.
There is one thing I do differently than you guys and, that is I set the subs higher than 75 dB. When you measure in the nearfield, the measurement will be higher than when the sub is further away. (Outdoors, you lose 6 dB for every doubling of distance. Indoors, it's more like 3 dB per doubling of distance due to room reinforcement.) If your 1st measurement is at 1 ft., then at 2 ft. you'll be down 3 dB, at 4 ft. down 6 dB, 8 ft. down 12 dB., etc. So, if you set them at 75 dB in the nearfield, they'll be down significantly when they're deployed in the room and measured at the listening position. To get them back to Reference Level, Audyssey would need to boost the trim level. This opens the possibility to overdrive the sub amp's input and cause distortion.
I have found that setting them to 85 dB nearfield, (1 ft.), is a good starting point. Then, when they're placed back in their in-room locations, each individual sub is below 75 dB. However, once combined, they are back to close to 75 dB. I then run Audyssey and it calibrates the combined output of the subs to the speakers at Reference Level. I usually end up with a slightly negative trim level, (-3 to -5), which I believe is better than a positive trim level, (boost).
Anyway, I'll play around with HTgeek's technique next week when I get my 80.2. I'll report back with the results.