This sub revealed sounds I had not noticed before in my music. My old sud did not go as low. It has a biiger foootprint on the floor than I imagined, and the spring terminals for the speaker level inputs and outputs are really small, so you need to be carefull connecting them, or they could break. The speaker pin plugs Monoprice sells did not fit in them. Other than that, it is good.

The design is what it is, flat for convenience and to be hidden out of the way, which is what I used it for. It adds a bit of punch to my low wattage tube amp (also monoprice) and Klipsch 600m v2 spearkers. I could live without this sub but it does add texture and quality on bass heavy audio. Recommended with reasonable expectations.

Almost two years old and very happy with it. I use it on my outside screened porch under a couch and it adds enough bass to make it worth the while. Haven't had any issues with it being outside year round (Ohio) but it's very weel covered by the couch and rain/moisture isn't an issue.

Bought a pair, house shakes, and not even on full volume. Best bang for your buck...

When setting this up with my AVR, one of the first things I needed to do for the AVR to do its level-setting analysis (Audyssey) was adjust the speaker volume knob while a test tone is playing. But of course the knob is on the bottom of the unit where it's not accessible, and lifting the unit to gain access changes the perceived volume level (granted, very slightly), making it harder to adjust the volume accurately.

The RCA jack for the signal input is in the same location, which means the cable immediately has to do a sharp 90 degree turn, to run parallel with the floor (or whatever surface this speaker gets set or mounted on). The jack also seems a tiny bit undersized, so the cable fits loosely (the cable itself fits fine on other RCA jacks).

Finally, the first speaker I received was DOA. Fortunately, Monoprice's return process is convenient and easy, so I was able to receive my replacement reasonably quickly. Still, obviously it'd be nicer to not have to go through that at all.

All that said, the subwoofer does perform as advertised. I set the crossover to the max frequency (150 Hz) and let the AVR decide where to actually balance this speaker with the others. The result seems perfect to me. The speaker fills in the bass just right, without being overbearing. And the form factor is great for my needs, a relatively small room for watching TV, with furniture crowded in and not much space left for a large speaker. For now it's on the floor, but I may well take advantage of the wall-mounting option (though, unfortunately, the wall mount brackets only support a horizontal "landscape" orientation...a vertical position would work better in my case, to provide better clearance for other furniture nearby).

I would love to see at least the volume control moved to a more accessible location, if not an improvement to the input jack to allow the cable to fit more securely and with less strain on the cable. But once everything's set up, this speaker has worked fabulously.

So I purchased this to replace a pretty basic sub to complement my tv sound bar. I currently have 2 of the 13THX ultra subs for movie watching but I don?t always want to watch with everything on, or my kids will watch something and they want to just be able to run it on and go.
Truthfully the pictures don?t do this unit justice. I ordered the 12in on and it is much larger than I was expecting? but that?s not a bad thing. The finish is kind of an orange peel textured surface that makes it look really clean and neat.
I hooked this up using a ?y? splitter to both inputs, turned the crossover to about 80 and the volume most of the way up. Then I adjusted the levels in my tv. I was blown away by the output and thunderous sound this produced.. it almost felt like my larger subs were up an running.
Playing demos like ?Dune?and ?Ready player one? you can hear where the super lows roll off below 20Hz unlike the 13THX ultras that get down to 10hz without batting an eye.
This really is a killer sounding sub at an amazing price.
Tuck it up under your couch you?ll never see it but boy! You?ll feel it !

It was a bit larger than I thoughjt but it fits and works well.

For the price and the form factor, there is nothing out there that beats this.

i ordered this as a test to see if the flat design would be as powerful and discreet as advertised. if it was a dub, i was ready to ship it back for a traditional box.

BUT it did NOT disappoint! in fact, it exceed my expectations by a stretch.

if fits perfectly underneath my sofa and my 2.1 system is now perfectly rounded and complete. i?m an audio engineer by trade and if i know anything, it?s once you live with a subwoofer, you?ll never go without it.
it?s like living in an apartment with a dishwasher or a washer dryer?there?s just no going back once you get to that new level.

i?m buying another for the studio and wall-mounting it to the surface under my desk. perfect item, perfect price. worth waaaaayyyy more than what i paid. perfect.

Photo rotated by Monoprice website for some reason; it is upright on edge to fit in my bookcase - and to have access to the controls. It is much bigger than I was expecting, about 8" thick, but 18" x 30". It weighs about 40#.
I am not an audiophile.
Being used in a small music room, 12x14 with 10' ceiling, so my needs were modest. Adds nice depth to the bass using about 60 Hz crossover (analog dial from 50 Hz - 150Hz) and gain at about 75% (also analog), using speaker wire connection (due to the my 1980's primary speakers)
Definite upgrade from my prior low cost subwoofer from a compact system from the 90's. Compared with Dis Is Da Drum album (Herbie Hancock), esp "Call it 95". Night and day.
Bummer: several days after my purchase, price dropped $30 :-(