QSC KW181 1000W 18" Powered Subwoofer

1,000-watt Subwoofer with 18" Low-frequency Driver
QSC KW181 1000W 18
QSC KW181 1000W 18
Sweetwater Savings: $350.00 MSRP: $1,749.00
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QSC KW181 1000W 18" Powered Subwoofer
In Stock!

Ultra-efficient, Earthshaking Subwoofer!

When we first experienced QSC's super-powerful and amazingly portable active K-series PA speakers, we were blown away, to say the least. Now, here's your chance to change the way you look at live sound; add the KW181 active subwoofer to your PA rig and prepare to be amazed! QSC packed a 1,000-watt, Class D power plant into this sub's premium birch enclosure, and very effective onboard DSP lets you get the absolute maximum out of its 18" speaker. You'll love the connection and control options on the KW181's back panel. You'll also love the fact that this sub is built for the long haul. You won't believe how much beef this outstanding subwoofer adds to your sound!

If it's power you're after, then this is your sub. QSC built the KW181 to give you big-time performance, to the tune of 1,000 watts. And, thanks to the Class D design, this speaker won't break your back when it's time to set up or tear down! You get easy access to XLR and TRS connection options on the KW181's rear panel.

QSC built DSP right into the KW181, so you get the absolute most out of this speaker's formidable wattage. Guardrail protection keeps the amplifier safe from overloads and minimizes clipping. Hit the DEEP switch and hear just how big this sub can get. This isn't just a series of filters and limiters thrown in to enhance the sound; this DSP makes an already outstanding speaker incredibly efficient and perfect for any room.

You know that a well-made loudspeaker is only as good as the ruggedness of its enclosure. After all, if it can't take the rigors of the road, then what good is it? That's why QSC made the KW181 extremely tough. You get premium-grade Baltic birch cabinet construction, a tough steel grille, and very handy cast-aluminum side handles. This sub is made to make you sound great, anywhere you use it.

QSC KW153 Active 1,000-watt, 18" Subwoofer Features at a Glance:
  • K Series performance in a lightweight, birch design
  • 1,000-watt, Class D power module
  • Extensive DSP (featuring DEEP and Intrinsic Correction) enhances system performance
  • Rugged, texture-painted birch enclosures
  • Tour-grade 16-gauge steel grille
  • Comfortable ergonomic handles
  • Includes speaker pole
Add QSC's KW181 active sub to your PA and find out what big, full sound is all about!

Additional Media

PA Speaker Buying Guide

Tech Specs

Powered/Unpowered Powered
Power Configuration Single Amp
LF Driver Size 1 x 18"
Total Power 1000W
Inputs Dual Balanced XLR/TRS Combo (Line Level)
Outputs Dual Balanced XLR Full Range (Line)
Impedance 38k ohms (Balanced), 19k ohms (Unbalanced)
Frequency Range 40Hz-112Hz (±6dB)
Maximum Peak SPL 135dB
Enclosure Material Plywood
Mounting Options Floor
Height 20.1"
Width 23.4"
Depth 29.9"
Weight 88 lbs.
Manufacturer Part Number KW181

Customer Reviews

Based on 35 reviews
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QSC KW181's Rock

I enjoyed the extra thump I received when I paired the KW181's with my K8's and K10's. The clarity and quality of sound has my crowds jumping. I enjoyed these so much I also purchased two 152's. I'll be back to get more.
Music background: Mobile DJ


KW181 are more expensive then their counterpart, but worth every penny. Amazing low end. I run an 8 piece cover band with a pair of 181s with the K153s. Crystal clear from a hundred yards away. Great for any venue, inside or out!
Music background: Live Sound Engineer

Another Amazing Product From QSC!!!!

I exchanged the QSC K-sub for this subwoofer and let me tell you this subwoofer blows the k-sub out of the water. It is about 400$ more but is well worth it. I use it a few times weekly when I DJ and it definitely thumps. It is enough bass for small to mid size venues/bars and gigs. Very clean low end-bass response and can be pushed very far. I use it with the QSC K12's and together I have yet to come close to peaking the system. Job Well done again QSC!!!!
Music background: Recording Enginer, Disc Jockey, Live Sound

Fantastic Woofer

When my sales rep Alex Moralis recommended the QSC speakers to me, I had never heard of them. Next thing I knew they kept popping up everywhere and I couldn't wait to get some. The QSC KW181 is just an amazing piece of equipment that moves a large volume of air with apparent ease. I truly am blown away buy the performance of this speaker. I am also blown away by the knowledge, expertise and care that Alex delivers every time I need information or order something. Thanks Sweetwater and Alex you all Rock!
Music background: Pro Musician,


So I started with the EON 515's and a 518 Sub. No complaints until I heard the K-series and the KW 181. No comparison here. Yes, the K-series are twice the Watts of my EONs, but the bottom line is, you get what you pay for. I even sold my pair of brand new JBL PRX 612m's, the EONs and the 518 for a pair of K-10's, a pair of K-Subs, and a pair of KW 181's. I'm a convert from JBL to QSC's and I could not have made a better choice. If you think one KW 181 sounds awesome, you gotta here them when there's two of them, side-by-side....INCREDIBLE, house-shaking BASS!! QSC in general, makes awsome speakers with awesome features. GREAT JOB, QSC!!
Music background: Weekend performer
See also: PA Subs, QSC, QSC PA Subwoofers