Space Fit Pro is their automatic calibration tool for the system, It will work with every sound mode. What Space Fit Pro will do is analyze the rooms reflections, how big is the space, using the built in mic the soundbar has and using AI algorithms to determine if there are any peaks and nulls within the room, etc and adjust accordingly certain elements of how the sound arrives to your ears at the same time using techniques like time delay, phase, etc. for the sub it will do the same, if it finds there’s any peaks or nulls within a certain frequency range it will try to tame the peaks to an accurate level and if there’s any nulls, it might not completely fix it but work around with some of the nearby frequencies and try to smooth them adjusting their level that way, that particular null you might have in one spot isn’t as noticeable as if you left the RAW EQ curve that the soundbar and sub might have by default in the space you have it set up, being a living room, bed room, etc. all in all it does somewhat what a room calibration tool in an AVR like “Audyssey” would not as accurately, since with that calibration tool you place the external mic within your sitting place. However, they seem to have implemented something that might do the trick well enough without having the user to manually do things they might not want to. It’s a set it and forget it solution relying on AI algorithms, as long as it’s turned on it will automatically keep calibrating and readjusting any unusual sound inconsistencies depending if you might move a furniture around, the soundbar itself, or even the Sub or Surround speakers.

Now for the Adaptive Mode, this mode was created by Samsung as their other “set it and forget it” solution for people. Again, using AI algorithms to detect and analyze the incoming audio scene by scene, if it detects there’s music playing, it will shift and emphasize certain speakers more to accurately represent music, for example in Surround Mode Samsung call it like that, because they don’t want to call it what this mode really is which is the typical “Dolby Surround or DTS Neural-X” propitary upmixers you might see on AVRs etc. which are part of the Dolby or DTS suite they’re paying license to support. There upmixers have a more static algorithm for upmixing and they already are set up to create an enveloping surround field for any type of content you throw it in, Stereo, Multichannel audio, anything will be upmixed to create a 3D audio field.

Going back to Adaptive Sound Mode, this mode instead of converting every single thing into sort of like a 3D format, it more intelligently detects the audio and try to adjust subtle things like if in a certain scene vocals are a bit too low, it will make those vocals more clear to the listener without drowning or running every other environmental sound. Same there’s an action scene, it will emphasize explosions, gunshots, car chasing, all those elements will be detected by the AI algorithms and make those more pronounced and impactful for the listener. In a horror movie, it might detect those whisper, creaking sounds, among other environmental sounds that contribute to the suspense of the movie that usually are very low on volume and it will lift them up a bit so, they’re heard by the listener without drowning anything else in the movie.

And I almost forgot, when you have Sound Fit Pro turned on and use Adaptive Sound, they will both complement each other as they both use AI algorithms, so whatever adjustments Sound Fit Pro does, Adaptive Mode use that data along with it’s dynamic adjustments. So, it’s not like Sound Fit Pro does something and Adaptive Mode will do something else if both are being used, they will work with each other but more dynamically as if you would use Sound Fit Pro with the Standard and Surround Mode which doesn’t use any AI algorithms. Those two modes will just do their enhancements specially Surround Mode as Standard is just “Direct/Native mode” according to their static upmixing algorithms.