$6K PRS Line 6 Giveaway

Alto Professional TX18S 900-watt 18-inch Powered Subwoofer

900W Active Subwoofer with 18" LF Driver and DSP
Share
Item ID: TX18S
Alto Professional TX18S 900-watt 18-inch Powered Subwoofer
Price:$599 and 00 cents
Special Financing - Ends Aug 2, 2026. $17/month with 36 month financing*

Or we have a used model for just $479 and 20 cents! Learn more
In Stock!

Note: While most of the items we sell ship for free, this item does not qualify for free shipping due to special circumstances.
Add to Cart
Sales engineer photo
Ask An Expert

Our expertly trained Sales Engineers are ready to help!

What is a Sales Engineer?
Sweetwater Gear Exchange

Have one to sell?
Check out Sweetwater's Gear Exchange!
Learn More

Complete Your Order
Product Image - This Item - Alto Professional TX18S 900-watt 18-inch Powered Subwoofer
Alto Professional TX18S 900-watt 18-inch Powered Subwoofer
$599.00
+
+
=
Buy all:
OR
Alto Professional TX18S 900-watt 18-inch Powered Subwoofer
In Stock!
Price:$599 and 00 cents
Add to Cart
Add to list
Skip to Description
Most Popular Accessories & Related Items
Back to navigation

This article was Written By

Our Product Research Team

Get to know them!

900 Watts of Bass-boosting Performance

Do you need to bolster your bass? Of course, you do — thanks to its burly 900-watt Class D amplifier, the Alto Professional TX18S is definitely up to the task. This 18-inch powered subwoofer is a true behemoth, capable of filling any small- to mid-sized venue with ground-shaking low end. Moreover, the TX18S’s DSP-enhanced design provides a bevy of pro-level features, including EQ and system protection, Music and Live EQ voicings, a selectable lowpass filter, and polarity reverse. Here at Sweetwater, we’re impressed with the generous I/O on the TX18S, which includes XLR and 1/4-inch line inputs and balanced XLR line outputs. The TX18S is truly roadworthy, boasting a rugged front-ported MDF cabinet with internal bracing, a full-metal grille, and a mar-resistant splatter-spray finish. Finally, the TX18S includes side handles for easy transport and a 36mm pole socket for straightforward installation. When you need an easy-to-deploy sub that’s built to last, the Alto Professional TX18S stands ready to deliver the goods.

Alto Professional TX18S Features:

  • 900W of ground-shaking low-end power for small- and mid-sized venues
  • 18-in. long-excursion driver with a 3-in. voice coil can easily handle the lowest lows
  • DSP-driven EQ and system protection
  • Music and Live EQ voicings provide simplified system refinement
  • Selectable lowpass filter and polarity reverse offer effective system optimization
  • Flexible XLR and 1/4-in. line inputs and balanced XLR line outputs
  • Rugged front-ported MDF cabinet with internal bracing, a full-metal grille, and a mar-resistant splatter-spray finish
  • Side handles make transport easy
  • 36mm pole socket provides straightforward installation

Resources

Warranty Info

Sweetwater's FREE 2-Year Total Confidence Coverage Warranty

Extra peace of mind at no extra cost.

  • Save money with FREE parts and labor
  • Get back to making music with the industry's fastest turnaround time
  • Fix it the first time with our award-winning, factory-certified Service Department
Learn More about Total Confidence Coverage
Back to navigation

Tech Specs

  • Powered: Yes
  • LF Driver Size: 18" subwoofer
  • Total Power: 900W Class D
  • Inputs: 2 x XLR-1/4" combo
  • Outputs: 2 x XLR
  • Mounting Options: Pole
  • Power Source: Standard IEC AC cable
  • Height: 23"
  • Width: 23"
  • Depth: 23"
  • Weight: 87.7 lbs.
  • Manufacturer Part Number: TX18SXUS

What Makes Our Sales Engineers Great?

Sweetwater Sales Engineers are a world-class team of experts dedicated to you. Hand selected from across the globe, each brings a wealth of experience and expertise in the world of music gear to provide you with unparalleled service completely free of charge. Friendly relationships, real trust, and the right gear are only a call or a click away!

Back to navigation

Reviews

Sounds good to me
I got one of these a few days ago, and will
Update review later on down the line. My opinion of this sub currently is great, it sounds pretty good! It goes low. It's not the loudest sub I ever heard And I will probably get a second one eventually. But for now it handled a 3 piece rock band at a medium-small bar just fine. It was just about the right volume without being too much. Two will be even better. It does start to red light if you push it too hard on its own, but for just one I was extremely pleased with its performance and have no complaints. Just don't try to fit it in an old Toyota Camry lol. It is also smaller than most 18s so that's cool.
Music background: Weekend warrior
Awesome so far.
We've done 2 performances with it so far and it surprised me at how great it sounds!!
Music background: Musician, vocalist