Originally Posted by HsuKevin
Ah OK! Yea basically you can average as many of the tones below the crossover and as many above. The more measurements taken, the more accurate that average will be. More of just a personal opinion, but I would definitely put more emphasis on the 25 Hz on up. Certainly ultra low bass is important, but I find that the 25 Hz on up region is where you get the majority of the bass as that contains the impact/mid-bass punch and even the low end rumble. So if your SPL meter doesn't read 20 or 16 Hz that accurately, it's not the end of the world imo.
Yeah, I'm not overly concerned with reaching bowel movement-inducing bass. I think I prefer tighter, faster, cleaner bass over big, rumbly, boomy bass.
I sort of half tried this out last night - didn't exactly do the part where you adjust the Master Volume on the AVR to read at 80dB running the 50Hz tone, but I wanted to see what readings I got with what my current settings are at the loudest MV level I generally listen at. The average of the tones below my crossover was around 74.8dB and the average above was about 74.3dB. I didn't count 16Hz or 20Hz tones into the averaging. My sub settings are: Q0.3, EQ1, Phase 0 degrees, volume knob set at the 9 o'clock mark. Speakers are crossed over at 100Hz across the board in my AVR (though I may switch it back to 80Hz, haven't fully decided on that yet). When I had run my AVR's room correction using the recommended Q0.7, EQ1, and 12 o'clock volume setting, it set the trim at 0dB - the rest of the speakers were either at 0dB or +1dB.
I'm not sure whether this would translate if I were to do the first step properly - I tried, and it was just *way* too loud for me to be comfortable doing it with my neighbour below, and I was getting far too much rattling/buzzing from things just in the room. I also didn't want to have the tone running too long for me to be able to walk around to figure out the exact source of that buzzing/rattling with that neighbour being below. I didn't really count 16Hz or 20Hz into the averaging.
I sort of discovered that (I think) my whole room has a null at the 50Hz mark because the readings on my SPL were far lower than the other tones (by around 10-17db). I'm not sure how this affects the first step as I would have to crank the volume up a lot higher than I probably should to hit the 80dB at my listening position (which is really only about 5-6 feet away from the speakers - the sub is only 2-3 feet to my left from where I usually sit) even if I set the volume knob on the sub at the 12 o'clock mark - it's largely why I was getting so much rattling/buzzing when I ran the one other test tone after adjusting the MV to read ~80dB for the 50Hz tone.
If you have any suggestions on any adjustments I could make to conduct the volume fine tuning at lower volume levels, I'm all ears (i.e. could I just use a lower benchmark when adjusting the MV running the 50Hz tone?). My room is pretty small (only 8' x 16' with an 8' ceiling) in a 900sqft apartment/condo.