ALTO TX18S 900W 18-Inch Powered PA Subwoofer

The ALTO TX18S is an 18-inch powered PA subwoofer rated at 900 watts, with selectable low-pass filtering and DSP-based EQ. It is a corded, floor-standing cabinet for DJ and powered-speaker setups, but its listed weight and cabinet size are important considerations for mobile use.

At a glance

Selectable low-pass filters are listed at 80Hz, 100Hz and 120Hz at 24dB per octave, allowing crossover adjustment for a PA setup.
The listing describes Music and Live voicing modes, DSP-based EQ and overload protection.
XLR connectivity is listed. The manufacturer feature text also claims XLR and 1/4-inch combo inputs.
The cabinet has side handles and caster threads. Casters are sold separately, according to the feature text.

Price

$499.00Save 17%

Reference price: ~~$599.00~~

Price checked: Nov 13, 2026

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Often bought together

ALTO TS415 2500W 15" Powered PA Speaker | 3-Channel Mixer, TWS Bluetooth Streaming, Wireless Loudspeaker Linking, DSP, and ALTO App Control

$399.00

Pros and cons

Pros

An onboard amplifier means the subwoofer is powered rather than requiring a separate subwoofer amplifier.
Selectable low-pass settings and voicing modes offer options for pairing and tuning in a PA system.
The stated 18-inch driver size and pole socket support integration into larger PA setups.

Cons

At 37.6 kg and listed dimensions of 23"D x 23"W x 23"H, this is a substantial cabinet to move and store.
The product is not waterproof, so it is not suited to wet conditions.

Technical specifications

23 specifications

Identity
Brand	ALTO
Model	TX18S
Speaker type	Subwoofer

Audio
Maximum output power	900 watts
Subwoofer diameter	18 inches
Frequency response	100 hertz
Audio output mode	Stereo
Audio channels	1
Driver type	Dynamic Driver

Connectivity and controls
Connection listed	XLR
Control method listed	Touch
Compatible devices	DJ Mixer, Powered Speakers
Additional features	DSP-based EQ, Selectable Low Pass Filter, Portable, Durable

Power and battery
Power configuration	Corded Electric
Input voltage	120 volts

Dimensions and installation
Mounting type listed	Floor Standing
Dimensions (D x W x H)	23"D x 23"W x 23"H
Weight listed	37.6 kg
Enclosure material	Wood

Other details
Color	Black
Waterproof	False
Warranty type	Limited
Warranty description	1 year manufacturer

What to know before buying

Listing details to confirm

Listing details conflict or remain unconfirmed: the title and feature copy specify 900W, while another manufacturer panel gives no matching output figure; the listed weight is 37.6 kg versus 87.7 lbs/39.8 kg in feature copy; the details say XLR connectivity but manufacturer copy additionally claims 1/4-inch combo inputs; and the stated 100 hertz frequency response is not reconciled with the selectable 80/100/120Hz filters. Confirm the relevant power, weight, input and response details for the selected listing.

Who is it for?

A good fit for

DJs and musicians adding powered low-frequency reinforcement to a PA system.
Buyers who want selectable crossover points and Music/Live voicing choices.
Setups using powered speakers or a DJ mixer and able to accommodate a large, corded subwoofer.

Less suited to

Mobile users who need a light cabinet for frequent solo carrying.
Outdoor or damp setups requiring a waterproof subwoofer.
Buyers who need the exact amplifier rating, weight or input configuration confirmed without listing ambiguity.

ALTO TX18S 900W 18-Inch Powered PA Subwoofer · photo 2 — Additional product photo 2

Customer reviews on Amazon

4.2 / 5 · 20 ratings

5 stars73%73%
4 stars11%11%
3 stars0%0%
2 stars0%0%
1 star16%16%

Aggregate customer ratings lean positive, with a majority in the five-star category, but a smaller one-star segment means the overall feedback is not uniformly favorable. With only a modest rating sample and no written feedback supplied, the figures do not establish why customers rated it this way or resolve questions about the listed power, weight or inputs. Buyers should judge those details against their PA requirements.

Frequently asked questions

Is the ALTO TX18S an active subwoofer?

Yes. Manufacturer copy describes it as a powered subwoofer with an onboard amplifier. The listing specifies corded electric power.

What low-pass settings are listed?

Manufacturer feature text lists selectable 80Hz, 100Hz and 120Hz settings at 24dB per octave.

Does it have 1/4-inch inputs?

The manufacturer feature panel claims XLR and 1/4-inch combo inputs, while the product details list XLR connectivity. Because the listing is inconsistent, confirm the actual inputs before purchase.

Are casters included?

No inclusion is established by the provided package list. Feature text says caster threads are present and casters are sold separately.