This is tremendous bang for the buck, but they undergo absolutely *no* testing prior to being sent out when these arrive from china. I ended up having to purchase two units the first 24 hours of receiving the subwoofer (Mono doesn't do anything resembling cross-shipping, they will not send another sub until they receive the old one, regardless of if you ask them to put a hold on your card for example...) The first one's auto switch worked as an off switch when switched to auto, the second one's auto switch works once per power on. Because of the incredible effort required in returning I'm just using a smart outlet to control the sub rather than using auto, or leaving it powered on.) As far as the performance goes, it's a 15" sub with a decent amount of boom. The performance drops off very quickly, so it's more of a mid-bass monster that performs quite well in music when dialed in, and it IS enjoyable for movie watching, but it doesn't hit as hard on the lower tones as the other (much more expensive!) options for 15" powered subs which is completely understandable as this is a fairly inexpensive beast and Mono wants to sell the monolith brand (which hopefully gets a lot more Q/A attention!) I don't regret purchasing this one (and I was refunded about 48 hours after my first sub was returned, I had to work with the return process as the sub is much too heavy for drop off, but it went fine.) I purchased this as a gateway to the monolith amps in the short term as well as the monolith powered sub in the long term and based on the quality of the two units I received and the lack of cross shipping return options, I don't think I'll poke their high price options. If you need cheap boom, these lowly $250 600W 15" subs are excellent items to look at but don't expect the auto switch to work properly and make sure you test them thoroughly the first 30 days. I'd personally rather front firing instead of down, but that's just nitpicking at this price point.

Pro: deep detailed bass
Cons: humming. Rattling from the amplifier area. Has taken over 20 minutes to turn on(twice).

love it, please review my account,paid 299.00,then with in 7 days,you drop it to 249.00,i paid for 2,please credit me.$50.00 each

I am somewhat of an audio file nut that occasionally enjoys live level sound and have for over 55 years. I like tight low cycle sound with clean highs. I recently installed a sound system in my 750 square foot office. I custom built a 12 inch Peerless ELS subwoofer in a sealed enclosure with a passive radiator powered with a 300 watt dayton plate amp. I built the subwoofer18 years ago. The amp is a Luxman LV 109 with a pair of Infinity SM150's and pair of SM120's. In the SM120 I replaced the 12 " woofer and midrange speaker with professional quality speakers. With the addition of the Monoprice SW-15 the stage presence is Wonderful.

I ordered this subwoofer when it was on sale for $249.99. Originally I had the 12" 150W $99 dollar subwoofer that MP offers and was pretty good so my expectations for the 15" were very high.

LIKES:
- The subwoofer hits hard and sounds great within the advertised frequency range 30-150hz.
- Great value even at full price.

DISLIKES:
- Below that frequency range it produces a lot of port noise (chuffing) and you can hear distortion noise coming from the cone. I wish they implemented a bigger port or dual port design.
- Also the port on the inside is not totally smooth so maybe that adds to the noise.
- Another issue is that the sub takes quite a bit of time for it to kick in.

Please check my video here showing the distortion and the time it takes for it to kick in.

https://youtu.be/6SvZiDwYhDU