The ULF score is a reflection of the overall output you have in the ULF range in your specific room, but unfortunately that doesn't tell the whole story to describing what your ULF experience is.
Why? Because everyone has different rooms with different construction (suspended floors, concrete walls, dry wall, etc.) with different furniture with different subs and with different placement of the subs. As a result, the sound waves produced by your subs will interact with those items very differently. Two people with the same ULF score could have a drastically different ULF experience because of their room's DNA so to speak.
I had originally wanted to come up with a Tactile Feedback score to augment the ULF score. The two combined would give folks a better understanding of how it "felt" to experience ULF in your room; the ULF score would give you an idea from a pressure/weight/kick in the chest standpoint, and the TF score would give you an idea from a "shaking" standpoint.
The problem with trying to come up with a Tactile Feedback score is that even that has so much variation dependent on the makeup of your room; two people with the same ULF score and suspended floors may have completely different experiences. One floor may have a resonant frequency of 6hz versus the other one having a resonant frequency of 30hz. Furniture is the same way; once HT seating may have a ULF resonant frequency vs the other one not having a ULF resonant frequency at all.
So instead of trying to assign a score to your room's Tactile Feedback, I believe the next best thing is to just identify Tactile Feedback enhancers (FX for short). This will at least give more details about your overall ULF experience.
Below is a list of Tactile Feedback FX
that typically enhance the ULF experience:
- Suspended Floor
- Transducers (ULF capable)
- Nearfield Sealed
- Nearfield Ported
- Nearfield Horn
- HT seating with a ULF resonant frequency
Are there any I'm missing?
Note that it's possible to just have 1 of these and it could potentially perform better than having all of these...it's truly dependent on the room and personal preference. However, generally speaking the more you have, the more tactile it will be.
I've adjusted the ULF calculator so that you can now record what you have in your room. These will be added to the member scores. I took a shot based on what I know below:
Feel free to add any Tactile Feedback FX I missed for your HT room by posting here. I will update the list accordingly. Note that you should only include Tactile Feedback FX that occur to your Main Listening Position. For example, if you have a second row riser, but that's not where your "Money Seat" is, don't include it in as part of your ULF card.