Originally Posted by ht guy
From what I've read, YPAO isn't much help below 35hz. Can I get a meaningful improvement in sound by investing in/running a mini dsp/umk-1/REW setup - even though I can't do the "sub crawl" and put them in the best place for sound (as I'm limited to the two placement options described?)
Originally Posted by Lyle Beach
I've seen this quote before. What does it mean? Does this mean my pair of Klipsch R-115SW subs arent producing any lower than 35hz? I only used the YPAO and use the "Natural" setting. I haven't used PEQ on my subs because I don't want to screw something up by not having the proper tools.
It means the mic supplied with your AVR and the software (YPAO) are not capable of measuring/correction of frequencies below 31.3Hz
If your sub is capable of playing below 31.3Hz it will certainly "play" content below that level, but if you have Peaks, Standing Waves, Nuls, Room Modes etc,
then YPAO will not make any EQ adjustments to your frequency response like it does for frequencies above the 31.3Hz "cut-off".
a UMIK-1 calibrated usb mic (~$75) or similar, that is
capable of measuring down to single digit frequencies, can help
when used with a laptop and REW (free software download) Link: https://www.roomeqwizard.com/
REW How To: https://www.avsforum.com/forum/91-au...l#post22823228
Once you get accurate data on what your room is really
doing with your sub(s) you can relocate your subs, or seating position,
add bass traps etc, to help correct any issues...you can also make Manual PEQ corrections in your Yamaha down to 16Hz to help tame any peaks you may have in your FR. (Frequency Response)
Nuls (aka a "dip") in your FR cannot really be fixed in software, you need to make physical room corrections or add more subs to even out your room across all seating positions.
A miniDSP is simply another tool that can be used to further tweak your sub(s) FR outside of the Yamaha's somewhat limited LFE/ULF 4 bands of EQ/calibration capabilities,
You can time align up to 4 separate sub output channels, and there are 10 bands of EQ at your disposal for each sub channel, all the way down to 10Hz.
I have 4 subs, capable down to ~10Hz and a bit over 14K watts of peak output power
and 4 Crowson motion actuators that are good down to ~3Hz....all running through my miniDSP 2x4HD.
I also use my miniDSP 2x4HD (~$200) to load Bass EQ (BEQ) low shelf frequency adjustments on the input channels.
Check out the BEQ thread if you get a chance, We have over 600 movie titles on the list so far that have restored the LFE/ULF on titles that have been heavily filtered.
More info here: Bass EQ for Filtered Movies