Of course, when all you got is a pair of desktop speakers that are almost as good as a pair of Logitechs!
Somewhat not surprisingly, Mikey always recommends a barrel of snake oil. 35KHz frequency response, yeah, that’s definitely what one needs to blow $20K+ on! (Assuming, of course, any of their specs are even real)
That’s the whole point of the 2 subs. You want them to fill out the music but not overpower the room like you would w an AV set up.
If you’re not hearing over 14kHz then your AMT shouldn’t be an issue, although you may ‘feel’ the music and the higher frequencies help fill it out even if you can’t hear it.
Take a look at these… https://www.youtube.com/watch?v=0S_ssYx7eUM
Brick walls will reflect sound. Your carpet helps but you would need to take a bunch of measurements to determine a ‘sound’ picture of the room.
I have a lot of glass windows. In our main room 2 walls are mostly glass and a lot of drywall. I could see doing something w the ceiling and sound absorbing ‘art’ on the walls. But just tossing out there may make any room issues worse. It would be better to get someone in to take proper measurements …
In my office my front wall behind my computer desk had a really bad echo/reverb when I do videos and video conferencing for work. So I put up some decent foam pads to remove it. I still have other room issues, but I don’t have the reverb or echo while doing things for work.
Here’s an idea, why doesn’t everyone stfu and listen to their music however they goddam choose on whatever equipment they have and not give a flying toss what someone on the other side of the world has or listens to… instead of getting every thread closed down because your penis isn’t quite big enough… just saying.
Mikey 
, that’s just logical.
My subs are controlled by RP. What is RP, you ask? … To me, it’s essentially the same thing as an AV receiver that utilizes a proper room calibration system—such as Dirac or Audyssey (found in Denon and Marantz units). I’m not trying to turn this place into a nightclub. Two subs distribute the bass more evenly throughout the room and help attenuate room modes even more effectively. Then you just run RP, and you’re all set. You really can’t have enough of it. 2.4 would still be an option for me.
But then no RELs, they will be push-pull or servo subwoofers.
Make sense, Mikey?
If you have any suggestions or questions, feel free to ask…
Well, it looks like you’ve got quite a few problems there!
Glass is the enemy of any listening room. But keep this in mind: don’t make the room completely acoustically dead. You can really mess things up if you go too far. Taking measurements before or after the implementation of bass traps or wall panels is useful for comparison. Ultimately, however, I am the one who decides whether I like the result—whether it sounds better to me, or if it’s just a total load of crap.
Oh, by the way, Mikey—you do enjoy experimenting and recommending loudspeakers, don’t you?
Have you ever looked into GGNTKT?
GGNTKT (German for Gegentakt—push-pull)
It’s been around here for quite a while, and I believe they have a good reputation.
I also found a video in English that covers the topic… 
@Bonte
Lots of things to unpack.
RELs are good subs. Fast. I haven’t listened to their HT line but the S and the T line.
I picked up the T/5x, because I needed a sub for the Mon Mini s and it was on sale.
It was one of the subs that was recommended by Mon Acoustic to pair w their speakers.
I tend to buy when I need something and will do some research before I buy. Also will pull the trigger on good deals. (Which is why I have the RS520.)
Windows.
I live in a condo in the city. I’ve got a corner unit where one wall is all glass and the other wall is mostly glass. In the other rooms, not so much. No dedicated space so you have to work with what you got.
In terms of room treatment… its minimal.
In my office, I had to take out the main reflection of the front wall because it was causing reverb in the mic… when I use the shotgun mic. I picked up a Rode Podcast mic so that cut down on any reverb, and I also have a set of wireless mics too. My back wall is a book case and some art work, which breaks up the sound so my only pain point is in the front corner.
In our main room, not a lot of treatment, but the light fixtures and some of the plants help to break up any reverb, but still far from perfect. In terms of adding anything… I have to get the wife’s permission.
Getting back to #2,
Even though I do my research, I tend to fall into the gear. I got a great deal on some adcom but after 12yrs I lost a channel and it was cheaper to replace than to fix. Ended up getting an AV receiver.
(Which later got damaged in a move. )
My VA Hadyns were picked up when a local stereo store was going out of business. Last minute impulse purchase back in 2000 or 2001. Got a really great deal on their demo unit. These are the ones that I recapped last year.
I picked up an Arcam Solo Uno that BestBuy was closing out since it was being discontinued. For an AIO its small, sounds great. But not a lot of power. You can get them from a place here in Chicago for $200 to $250 until they sell out. For $200 worth it. I use it for airplay / spotify connect as a second system.
(I would not pay full price… get an Eversolo play)
I purposely got the Mon Acoustic Supermon Mini s after hearing them at AXPONA. I needed small bookshelf speakers for my office. So got a slight deal at the show.
Then the REL.
I needed more power so I was looking. Wanted an AIO.
Came across an ad from a dealer who got the RS520 back from a customer who upgraded in to separates. He was using it as a floor model, needed to make room, so got an amazing price. Couldn’t say no. My end game for the office would have been Orchard Audio’s Starkrimson 25s probably w an Eversolo unit. (DMP-A8)
I also could have gone Cambridge Audio EVO150.
But the RS520 fit the bill, great price and here I am.
There are way too many speaker companies out there.
I’m looking to build my own. So I do a bit of research in terms of what’s out there and different designs.
So I’m not gear shopping per se.
I have to joke about the Perlistens because they are really close to Madisound where you can get higher end components. Parts Express are about an 1.5 hour drive from my sister’s place, but they got bought out and I heard they closed down the storefront.
The one Tangband speaker that I want, they won’t carry unless you do a special order and buy like 30 of them. (Its an 8" full range driver. ) Thinking about it for a MLTL or a Rear loaded horn design.
But for now its just at the planning stage.
Mikey, 
please stop that!
Then go grab a servo subwoofer and compare it to your REL!
You’re always complaining about Boris, but with statements like that, you practically attract him like a magnet. So you really have only yourself to blame—and yet you’re always grumbling about him.
Don’t make statements like that!
Mikey! You might not be a bad guy!
But if someone tells you to jump into the water, even though it’s just a rain puddle, would you still do it? You could hook up any well-engineered subwoofer to that system, but you wouldn’t hear the difference anyway, because your ears are aging. You would have to be no more than ten years old to perceive a part, or even the entire, of the hearing spectrum.
Thanks for the long post. 
You like YouTube, right?
Why don’t you make your own videos and earn a living that way?
Review loudspeakers or DIY projects—and if you’re good at it, companies will come to you and ask: “Hey Mike, would you like to review our speakers?” Then you’ll have plenty of options to compare, you can pick out the very best ones, and you’ll save yourself the trouble of building them yourself.
As a programming genius, are you actually capable of doing any manual work? I know people like that—guys who couldn’t even sharpen a pencil; as for a hammer, you certainly couldn’t trust them with one of those. It’s really true, no kidding.
Show it to me, or send a link. I’m interested.
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Well, thank goodness I’m not an audiophile—because I only sense the quarks, which have a greater mass and are heavier than neutrinos. 
@Bonte
First, fast is the term that was used by the Mon Acoustic guy. ( He’s the US rep out of CA, the owner was also there but he didn’t speak English, just Korean.) Others have used the term too.
You need a fast sub when pairing it to a speaker that has AMT / Ribbons / Planar Magnetic drivers.
And while I am getting up there in age, My hearing is still around 16 - 16.5kHz on a good day.
But besides hearing the music, you can feel it. And this comes into play w a sub. Now the REL doesn’t dig deep. Its rated for what? 30Hz? Larger subs can dig deeper, but for music, 30Hz is sufficient while going down to 25Hz would be better.
The mini s do 65Hz or so. So if you’re listening to some Jazz with a standup bass, turn off the sub and you know what you’re missing.
As to YT yes I do make some videos for technical work. I also have a channel where we post technical talks No money in it. We do it to share knowledge.
@Boris
Adults are having a conversation
Now be a good little boy and go play w the ASR folks.
Well, Mikey—16 Hz is subsonic bass! Bass at 16 Hz is felt rather than heard. Since this lies at the very lower limit of human hearing (roughly 16–20 Hz), these frequencies are usually perceived as physical pressure, vibrations within the body, or rattling in the room, rather than as a distinct sound.
Mikey! Are you going to tell me something ridiculous again?
But 16Hz is a good starting point!
Theoretically, my subwoofers should play down to 16Hz.
How do you know that, on your good days, your hearing actually perceives this frequency response? Do you go to an audiologist every day to have a frequency test performed?
In Germany, I have to undergo a hearing test—along with other examinations—every five years if I want to retain my truck driver’s license (for vehicles over 40 tons).
It’s my turn again this year. Five years ago, I could just barely hear up to 16 kHz. Let’s see how it looks this year.
That’s 16kHz - 16.5kHz. 
You can feel the sub below what you perceive as sound.
Of course YMMV.
For someone my age… they say avg is ~12kHz.
I’m amazed that I can hear as well as I do…
Yes, I hang my head in shame. I must have merely skimmed the text—seen only the “16”—and immediately gone on the attack. My apologies.
It didn’t have to be that one… yeah, I’m crazy…
That is realistic!