Originally Posted by dr_hsu
For most normal sized rooms, bass will always be weaker near the middle of the room. Yes, please do post your room layout. You can also do a simple hand sketch, take a photo of it with your iPhone (or equivalent) and email it to me at email@example.com.
I finally put everything together and started calibrating, here's my attempt for a sketch (please read the notes in purple for more info):
room-ht.png 22k .png file
VTF3 Mk3 settings:
- Volume is a quarter way up next to the line, that's at 9'oclock, right?
- Bass extensions = 2 ports open, not using plugs
- Phase = 0
- Crossover knob = max
- Crossover switch = out
I started the Yamaha YPAO auto calibration with FLAT EQ settings, I heard the Yamaha YPAO isn't good for subs at all, but here's what it gave me anyway:
Phase = Reverse
Crossover = 80Hz
Volume = was around 11 ticks louder than the normal (middle) dB settings !
I then set all the speakers to small and used my Analog RadioShack meter to adjust the sound level, volume on receiver was at -6 dB and then adjusted all the speakers be leveled @ 70dB on the Radioshack meter.
In the AVR settings, I changed the Subwoofer phase from Reverse to Normal (I have no idea what phase does btw) and adjusted the volume settings in the AVR so it would be 0, right in the middle.
I then used the supplied HSU disc and played the Third-octave-wide warble tones at the same AVR volume (-6dB) that I adjusted my speakers to 70dB, and here's what the sound levels were:
80Hz = 81.5 dB
63Hz = 85.5 dB
50Hz = 91.5 dB
40Hz = 92.5 dB
31.5Hz = 82 dB
25Hz = 78 dB
Note: The volume numbers are adjusted according to the corrected low frequency numbers for the Analog RS SPL, I'm sure those aren't very accurate since it's only a RS meter, but it's better than nothing I guess.
Now I'm not even sure if using such octave can be compared to the built in pink noise in my AVR that I adjusted my speakers with, but that's all I got to use. I needed to raise the volume of the sub by a lot when tried adjusting by the AVR pink noise, so I didn't do that since it sounded like a bad idea.
So, how bad are those numbers? Too many peaks? I have 0 experience with fixing peaks, nulls and don't know how to classify one to be honest.
Should I just lower the sub volume on the receiver by a bit (afraid it would be too little) or start moving the sub around?
Any help would be really appreciated Dr. Hsu and I apologize for posting too much messy info.