Eh hem!...Subwoofers... What do ya know?

I sold my active subs and got Duke's (audio kinesis) swarm with 4 subs and 2 amps, you locate the subs 2 in the front of the room the other 2 wherever just not together, these are very small units (wife loves to put things on top which are constantly falling as you could imagine), I just don't care about improving bass anymore it is so perfect, I will never use anything different than a distributed array ever again.@millercarbon I have mine on 8 ohms but I will be trying the 16 ohm series config, not sure with my listener skills I could hear it but willing to try, thanks for the tip

@phusis apologies in advance as you were addressing someone else, I understand the bass augmentation can be achieved easily with the distributed array, there is such a thing as too much bass, in my array (4x10 inches not morels) I have to tune down the amps to 50 percent and sometimes plug one or two ports, I also understand that if you add more 5 6 even 8 small enclosures which are easy to hide the effect increases even more. I had 2 powered subs with dual 18 inch drivers before and it didn't sound natural (to me), also from the amps you can change phase for two subs etc. which blends the bass even more.
I'm not trying to be argumentative with you but I respectfully differ from your opinion
Luis

Everytime i hear a rig with a sub for 2 channel, i can HEAR the subwoofer, its not a balanced / natural tone to my ears

@redmosessc if you ever close to Miami lakes, FL let me know so you can come by and listen by yourself, I have 4 subs and you need to put your hand on the driver sometimes to check if these are working. Of course you can hear what they produce but not in the boomy subwoofery effect, very natural indeed

Then they are running higher than 80Hz.

Yeah that is a typical mistake I made myself years ago running them at 120 sometimes 150 and below, looking back, what was I thinking?

n without using high pass filtering, matching the stand alone subs to the speakers presentation is impossible.

@m-db is not impossible, on my specific case the subs and the speakers are manufactured by the same company, speakers crossover and speakers themselves are tuned to the 4 subs and integrated with dsp amps.
The beauty of it is you can follow the designers integration recommendations or you can try to play and better the designers intentions (not that you could have a real chance to improve it much) tweaking dsp etc.
As and added convenience 2 out of the 4 subs share the same footprint as the speakers so no extra space needed. I have to add that I personally like the idea of separate subs from the speakers better in terms of location, true you need some extra real estate but not much and you have more options to locate the subs, you can even tweak with the vertical plane and locate 1 or 2  in your ceiling if you are up to the task (I am not)
In the case the designer is not the same you still can find speakers with proper integration, most speakers are ranged starting at 50 hz 60hz you could use dsp to match these values as well or modify the xover like you mentioned

So far this turned out to be not another non sense poisoned discussion, seems subwoofers are "a thing to avoid" for the usual trolls,which is great

We are getting now into time alignment, dsp and such, keep it coming, I will take my minidsp mic and rew out of storage and do some measurements on my own system.

Thanks to the OP, I bet the short cryptic title is a deterrent 😉

This is theoretically of course in the real world it won't happen unless the room have nothing in it, it is a geometric cube (or sphere) reflective materials all the same etc

I'm sorry I am assuming front and back subs, if you have them on the sides the effect kind of would be the same

If you time align the back sub to fire when the front wave hits him and you also phase it 180 degrees, theoretically both waves cancel each other and you don't hear the reflections again

And these are not my ideas or research, you can ask Duke LeJeune with Audiokinesis from which I learned everything I know about subs and which swarm array (trolls like the word or not) is the best bass solution I found after trying the conventional ones, he is IMO the one source of truth to go for these matters, I think he have commented in this thread already

@millercarbon Very well said
Emphasis on this

his one fault is being blessed with an overabundance of modesty