I ordered the monolith sub to complement my existing SVS PBUltra, and although the SVS cost 30% more, the monolith behemoth produces satisfying bass output at absurd volumes. The Monolith rivals the SVS in low-frequency performance, if not surpassing it. However, I wish Monolith integrated modern usability touches, like the front LCD, remote, and app you get with the SVS and other premium subwoofers.

Gobs of power. Plays insanely low. Be prepared to find and silence all the rattles in your home.

Input gain a little low, need to bump sub pre out on your AVR. Did audyssey on my 3800, then bumped sub to +6db, with sub gain knob on +6.

Couldn't be happier. Handles Dolby Atmos at reference level with headroom to spare.

Using in a 16' x 20' room. This speaker provides excellent deep bass for my home theater system. It is combined with a Klipsch 12" sub running from a Yamaha TSR-7850

Beast of subs . Lots out crazy output. . The 2k watts don't disappoint. I went dual from the start because I have a huge 2 story tv room so lots of area to fill . I'm blow away . The subs are super capable with excursions deep so in other words these speakers move some crazy air

Powerful and clean bass!!! I got two of this babies and I am still impress. The powerful bass moves my seat!

I have two of these subs and they are oustanding and the output is absolutely biblical! I use mine in all the default THX settings with all ports open (receiver is Denon with sub trim set to 0.0dB) in a 17x20 dedicated theater room.

They handle anything I can throw at them with ease without any chuffing or weird mechanical noises. For example, it doesn't even break a sweat during the opening scene (frequency sweep) of "Edge of Tomorrow", it actually scared me a little bit the first time I played it, lol.

One of my favorite movies to watch with these subs is Ford V Ferrari. The bass is so detailed (textured?) you can feel the engines rumble and the cars on the track. It's an aboslute outstanding watch with these subs.

I'm using my subs with Y input cables and haven't had any issues with them being too quiet.

Size wise they are large, but if you get carpet slides on the bottom they are super easy to maneuver and move around so that hasn't been a concern for me.

Now for the one annoying exception. The subs both of them emit a slight pop when coming out of standby and for the price point I don't think they should do this.

To Monoprice's credit, they did RMA new subs for me and the replacements did it as well. What's strange is that they will do that when nothing is connected to them. In this case, I touch the end of the RCA cable to make them come out of standby and they both pop. Pretty dissapointing.

However, for how good the bass is, I can deal with it.

Regarding the RMA process, this is something to be aware of. If you buy these subs you will need to keep all the packaging for the duration of the warranty. Currently Monoprice does not ship parts for these subs. They will RMA the entire sub. However, go to YouTube and from the Channel "Youthman", watch his video titled
"FIRST LOOK at the Monolith 13 THX Ultra Subwoofer - Unboxing & Overview"

The way he unboxes the sub makes unboxing (and reboxing) these subs a breeze.

I'm hoping in the future they'll start shipping parts, but just wanted to add that here.

Hands down, this is the best subwoofer if you are not into building your own subwoofer. The fit and finish is perfect. The packaging was double boxed and came in on a half sized crate. It weighs about 190 lbs. If you need help, there a thread on AVS Forum on how to take this one upstairs effortlessly. Basically, leave it in the box or styrofoam, and using two wood close post hangers or metal sticks, straps, and carry it on your shoulder like people carrying buckets of water in Asian. Minimum 2 people required.

As for the sound, superb, very low, and very clean with lots of headroom. It's a steal when it is 15% off (1823 shipped). It's also OK for sale and regular price for those that can afford it.

I highly recommend this sub. Get 2 of them if you can afford it. It will likely be more than a decade before anything of the same size will beat this subwoofer.

If you want something bigger, you need to head over to the AVS Forum and look at the DIY section.

This thing is a beast. Make sure to measure any stairwells, hallways, door openings, etc. and I highly recommend leaving it on a couple sheets of cardboard if you need to do the sub crawl dance. Or just buy multiple subs, it?s probably easier. Showing this off with 1917 or Tron Legacy makes me giddy. Ask forgiveness not permission.

Incredible packaging for the subwoofer. Down right impressive.

this sub is a monster in every way would recommend if your looking for the king of subs