Skip to main content
FREE 2-Day Standard Ground Shipping (edit) Get Details

More Info About Free 2-Day Standard Ground Shipping

Close Window
Top Seller

QSC KW181 Powered Sub Woofer 18" 1000W  

Item #: 
  • Write a Review

Building on the success of QSC's K Series, the KW181 subwoofer, like the rest of QSC's KW active loudspeakers, represents QSC's next evolutionary step in wood enclosure loudspeakers. The system engine... Click To Read More About This Product


Gear returned in mint condition. If you're looking for a virtually new instrument in possibly less-than-perfect packaging, this is a great value.
  • Includes 45-Day, No-Hassle Returns
  • Includes full manufacturer's warranty
Gear returned in great condition, with only minor signs of use, such as slight scuffs or pick marks. It looks and plays like new and may be considered an equivalent to display units found in retail stores.
  • Includes 45-Day, No-Hassle Returns
  • Includes full manufacturer's warranty
+ Add to Wish List
Special Financing Offer
Guitar Center Gear Card

6-Month* financing available
Get DetailsAbout Special Financing Offers

Free Store Pick Up Available Today Denver, CO (5.5  mi) View More Stores For Availability


Connect with an expert instantly.

Call us: 866-498-7882

  • Pro Coverage Eligible
  • Free Shipping
  • Easy Returns
  • Videos

Building on the success of QSC's K Series, the KW181 subwoofer, like the rest of QSC's KW active loudspeakers, represents QSC's next evolutionary step in wood enclosure loudspeakers. The system engineers created the KW series to feature all the groundbreaking electronic attributes of the popular K Series while at the same time designing a product that is both smaller and significantly lighter than previous wood enclosure models.

High Output
Like it K series predecessors, the QSC KW181 speaker features a QSC designed, 1000W (2 x 500) Class D power module. The loudspeaker is also fitted with an 18" cone transducer of the same high-quality design.

Extensive signal processing is employed throughout the QSC loudspeaker, providing levels of sonic clarity and total output that defy all expectations for a speaker in this category:
¢Intrinsic Correction: first featured in QSC's high-end line array products, it maps 65-75 spatially-averaged measurements to IIR and FIR filters that actively adjust time, frequency, and amplitude response to a maximally flat bandpass target. The result is an active speaker that behaves equally well across the entire sound field
¢DEEP and excursion limiting allow for extended low-frequency response by actively managing low-frequency transients without degradation of the underlying signal or adjacent frequencies
¢GuardRail protection, first introduced on QSC's GX Series amplifiers protects both the amplifier module and your performance from unnatural and destructive clipping

The QSC KW181 subwoofer speaker features dual balanced female XLR / 1/4" line level‰input, dual balanced male XLR full-range line leave out, remote gain control via a potentiometer (sold separately), and a locking IEC power connector.

The QSC KW181 speaker has an LF switch which can be set to NORM, DEEP for additional bass extension. The rear panel LED switch can be set to POWER, illuminating the front-mounted LED when the QSC speaker is powered on, OFF for applications where it is not desirable to illuminate the front LED, or LIMIT which indicates to the system operator that the clip limiter circuit has been engaged during operation.

Premium-grade materials:
The QSC KW181 subwoofer, like all its KW Series brethren, is designed to withstand the rigors of professional use. Advanced construction processes, premium-grade Baltic birch cabinetry, ergonomic, cast aluminum handles, low-noise casters, and a highly protective steel grille provide for ease of transport and long-term durability. The QSC loudspeaker's integrated M10 suspension points allow for flown applications and a threaded pole receptacle provides for a positive, wobble-free connection to a threaded speaker pole (included).

Features Speaker configuration
  • Active/passive:Active
  • Type:Subwoofer
  • LF driver:18"
  • MF driver:N/A
  • HF driver:N/A
  • Power
  • Amplifier class:D
  • Wattage:1000W continuous
  • Mixer/preamp:No
  • Audio
  • Frequency response:39Hz - 145Hz
  • Coverage pattern:N/A
  • Max SPL:132 dB
  • Inputs
  • TRS:
  • TS:
  • RCA:
  • Output/thru
  • XLR:2
  • TRS:
  • TS:
  • RCA: 
  • Enclosure
  • Cabinet material:15 mm painted birch ply
  • Width:23.4"
  • Height:20.1"
  • Depth:29.9"
  • .

Pro Coverage gives you added warranty protection for your gear. Stepping in where the manufacturer's "normal wear and tear" coverage ends, our Pro Coverage program offers you upgraded coverage if your product ever fails Click To Read More About This Product.

Pro Coverage includes
  • Accidental damage protection
  • Expedited repair or replacement
  • Free shipping (for returns or repairs)
  • 100% coverage for commercial use
  • Extended price protection
  • No lemon guarantee
  • Free transfer of coverage to a new owner
  • Repair costs covered for up to five years from date of purchase
  • Repair authorization-toll-free by phone or via the web
  • Customer Reviews

Review Snapshot

by PowerReviews
QSCKW181 Powered Sub Woofer 18" 1000W

(based on 25 reviews)

Ratings Distribution

  • 5 Stars



  • 4 Stars



  • 3 Stars



  • 2 Stars



  • 1 Stars




of respondents would recommend this to a friend.


  • Durable (5)
  • Good audio (5)
  • Easy to use (4)
  • Compact (3)


No Cons

Best Uses

  • Outdoor events / games (5)
  • Pro audio / DJ / mixing (5)
  • Performances (3)
    • Reviewer Profile:
    • Experienced (3), Professional musician (3)

Reviewed by 25 customers

Displaying reviews 1-10

Back to Top

Previous | Next »

(40 of 47 customers found this review helpful)



By One-3

from Washington DC

Comments about QSC KW181 Powered Sub Woofer 18" 1000W:

I started with the K sub and it was ok but didnt have that punch for bass heavy southern hip hop, reggae and techno/pop. Guys I plugged in that mtuha freakin' KW181 and with the dial set at 1 'o clock the difference was clear! I listened to the Monica "Love all over me" and the bass was ridiculous.....I had a moment! I got a little choked up.

(9 of 9 customers found this review helpful)


Monster Subs - Serious bottom end!

By Oracle Soundguy

from Gaithersburg, Md

About Me Professional Musician

See all my reviews


  • Clear Sound
  • Compact
  • Durable
  • Easy To Use
  • Lightweight
  • Loud
  • Stackable
  • Versatile


  • Low to ground
  • Short poles

Best Uses

  • Events
  • Live Sound Reinforcement
  • Mobile DJ
  • Performances

Comments about QSC KW181 Powered Sub Woofer 18" 1000W:

I did my homework. Spec'd all the major subs on the market, both single and double 18", as well as some of the other 12" ported cabs. On paper these speakers compete about evenly with the others from JBL, EV, Mackie, and others.

Then came the listening tests, and everything changed. My eternal thanks to Scott Schwarz at GC Pro Rockville Md for his assistance in letting us audition these speakers. The KW 181 simply blew me away. We do a variety of rooms, from huge ballrooms with 1000+ people to outdoor concerts to smaller nightclubs. A single pair were sufficient for one of the largest nightclubs in the area, and in the smaller clubs I had to turn them down to keep from shaking the ceiling tiles out.

After purchasing the first pair I was so sold on them I immediately went and purchased a second pair. One reason was that we wanted to get the top speakers up higher. The one drawback is that the pole isn't that long and the KW152 doesn't get up over the heads of the audience if it's set on the floor level.

Once I put the two pairs together at a large show, I was beyond blown away. The speakers coupled together perfectly. Neither speaker was being pushed anywhere near max, and the result was an enormous amount of thump that was clean and distortion free.

There are indentations and feet on the top and bottom to allow them to stack and lock together easily. The pair felt like a single double 18" cabinet, yet I could move each piece without more 160lb cabinets to lug around! For small rooms I just use a single pair, but the rest of the time I use both pair. I'm looking forward to our first outdoor show of the year. I'm thinking my back is going to heave a sigh of relief at not having to tote massive heavy cabinets around anymore!

(8 of 9 customers found this review helpful)


Spend a little extra money, you won't regret it.....

By DJ Contol - Gary

from Sacramento, CA

Comments about QSC KW181 Powered Sub Woofer 18" 1000W:

I've been trying to find the perfect speaker which is portable, but can put out great sound. I started with the Cerwin-Vega CVA118, QSC K-Sub, and the Harbinger 18" Sub. All sounded ok, but was just missing something. I've found what I've been looking for, the QSC KW181. It blew my mind with the clarity and full spectrum of great sound and is very portable. QSC hit the mark on this one....a little pricey, but once you go through all of the speakers I had your better off buying the best.

(7 of 9 customers found this review helpful)



By Tim

from cornwall ny

Comments about QSC KW181 Powered Sub Woofer 18" 1000W:

I just purchased this sub last week. I must say this sub is great. When I took it out of the box I noticed how well it is built. The wheels built in are great and front grill is heavy duty. I bought the sub for its compact size. The sub will fit under almost ant table. The smaller size makes it easier to pick up. Last and most important the bass pounds. In my opinion, the only negative is that it does not have a built in crossover.

(7 of 14 customers found this review helpful)


Not enough sub bass for dance music...

By Kerry West

from Flowery Branch, Ga

Comments about QSC KW181 Powered Sub Woofer 18" 1000W:

Started with the EV power 18 and quickly took it back. Thought with qsc and all the reviews I would step it up and try the qsc. Although it is very punchy and clean sounded bass it is not a good sub for hip hop and dubstep type music. I was hoping though cause the 6 year warranty was a BIG plus. Took it back and tried the Alto Black 18 and WOW found the right sub for dance type music. I do however think for live music, ie a live band the qsc would fit very nice.

(6 of 6 customers found this review helpful)


Best sub i've ever heard.

By Simone

from Addison, Illinois

Comments about QSC KW181 Powered Sub Woofer 18" 1000W:

Aright basically, i bought this sub before even hearing it, i just read the reviews, and was amazed by what everyone was saying. i just used it for the first time last week. It was a cotillion, and there were 2 bands with the dj (me). I did a sound check, and the band was amazed by how much bass this sucker gives out, that they ran their equipment, through my sound system. I DEFINITELY RECOMMEND BUYING THIS. YOU WILL NOT REGRET IT.

(6 of 6 customers found this review helpful)


Loud, Sexy, and Bassious

By Brian Diener

from Clovis, CA

Comments about QSC KW181 Powered Sub Woofer 18" 1000W:

If you are on the edge of whether or not to buy this sub, go ahead and close the other tabs with the JBLS and Mackies open because this will be your last time buying a sub, as it goes beyond everybody's expectations and then some! To start, this single sub puts out the equivalent to what 2 other subs can't. It is compatible with every powered speaker I have heard of and will make your system sound 10x louder. But the important part... How does it sound? Well, I turned it on without deep mode and my neighbors texted me and said they could feel the bass inside their own homes. To even further this, I live in a country neighborhood and the nearest house is a few hundred feet away. The second test with the KW181 I did was in my garage. The tools on the workbench were vibrating and I had to move the sub out from under my table (even though it fits great) because my laptop was vibrating up to the edge of the table and the mixer as well. I am super happy with this sub, I am currently using it with QSC K10s and the combo sounds great. No other sub gives the rumble that this one pounds into your chest. The casters are very quiet, no rattling here! Also, nobody can beat a free 6 YEAR Warrantee. Have you even owned your current sub for that long, let alone your entire sound system? QSC KW-181 Everybody!

(6 of 6 customers found this review helpful)


QSC ........ WOW


from Baltimore

Comments about QSC KW181 Powered Sub Woofer 18" 1000W:

Hey there, You can't go on reviews alone to buy speakers, it is wise to go into a store and listen to the speaker. I am a mobile DJ who plays Reggae, Soca, Rap, Pop, Disco and R&B I started out with a pair of QSC Ksubs and Berinhger 215D top because i needed a system that was portable for me to carry around but did not get the bottom end from them that i was looking for. I upgraded my tops to the QSC KW122 I eventually traded the a pair of Ksubs for one of these QSC KW181 bad boys man and i was blown away by the bottom end from this sub. It is punchy, loud and has clean bass notes, you can't go wrong with this bad body. I am so freaked out and only had this 3 weeks that i am looking to buy another one in the coming weeks. Great Job QSC

(5 of 5 customers found this review helpful)



By Paul Russell

from Baltimore Maryland

Comments about QSC KW181 Powered Sub Woofer 18" 1000W:

I bought a Harbinger powered 18 inch sub and it worked great used it for about 6 months and had many compliments etc. That was until I purchased the QSC KW181 one word WOW!! I already use the k8's and k12's 5 nights a week. The sub is incredible, clear hard hitting bass.Seven straight hours right out of the box with zero problems. I was so used to having to let the harbinger cool down and back way out of it to keep it from clipping, I was blown away with the quality of the cabinet, the casters are fixed to the rear and heavy duty they will not rattle like some and it runs cool.Also It's low profile design allows it to fit under your table perfectly.I plan on adding another one to my setup very soon. The same crowd that was at the bar the week prior asked me what in the heck did you do? The bass is incredible. I just smiled and replied upgrade which made my night.

(5 of 5 customers found this review helpful)


QSC Rocks, this bass almost demolished my house

By Marco Naranjo

from Miami, FL

Comments about QSC KW181 Powered Sub Woofer 18" 1000W:

I'm a mobile DJ, right now I'm building my new active PA system.. I have been using a passive set of two 18' subs and two 15' speakers they have a great sound, I use QSC amplifiers, crossover and EQ to move them and the sound power and quality is just perfect... having said that, I was so skeptical that the active system was going to be equal or better than my system, I was soooo wrong, so far I have bought one EV live x 15' and this outstanding QSC KW181, this combination is working just perfectly. The bass is extremely powerful, the sound quality is even better than my old ones, when I turned this on in my house, the roof, the windows, the walls the complete house was shaking, actually I was trying to make it peak and I couldn't, maybe when I take to a ballroom. Botton line, I'm going to buy my second one, QSC is quality and great sound, you can't go wrong with this one.

Displaying reviews 1-10

Back to Top

Previous | Next »

You are changing the Ship-To country.

Our product catalog varies by country due to manufacturer restrictions. If you change the Ship-To country, some or all of the items in your cart may not ship to the new destination.