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JTR Captivator 4000ULF-ST Subwoofer
JTR Captivator 4000ULF-ST Subwoofer - Image 2
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JTR

JTR Captivator 4000ULF-ST Subwoofer

JTR

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$5,899.00

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Description

JTR Captivator 4000ULF-ST is a bass-reflex subwoofer with dual 18-inch drivers and a 4000 W DSP-controlled amplifier designed for very deep, controlled low-end output. Built with a tall, braced Baltic birch cabinet and front-firing design, it delivers strong, clean bass pressure for serious home theater and music systems.

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JTR Captivator 4000ULF-ST Subwoofer

$5,899.00

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Description

Built for Bass That Doesn’t Back Off

If you want low end that shows up and stays solid, the Captivator 4000ULF-ST is built for that job. With dual 18-inch drivers in a tall, low-tuned bass-reflex cabinet, it delivers deep pressure that hits right away and keeps going when scenes get heavy.

Power That Holds Together

A 4000 W RMS DSP-controlled amplifier gives you the headroom to push without sag. The large slot port keeps airflow clean, so output stays strong instead of compressed. You get depth and punch together, not boom.

Heavy Build, Easy to Dial In

The cabinet is thick Baltic birch with heavy bracing, keeping vibration out of the picture. Everything fires forward for flexible placement. With XLR and RCA inputs, auto turn-on, trigger support, and LF adjust, setup is straightforward and predictable.

Key Features

  • Dual 18-inch high-excursion drivers

  • 4000 W RMS Class-D amplifier with DSP

  • Bass-reflex design tuned for very deep output

  • Tall cabinet for stronger low-frequency reach

  • Large slot port to reduce turbulence

  • Front-firing cabinet for flexible placement

  • Balanced XLR and RCA connectivity

  • Heavy Baltic birch cabinet construction

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Specifications
Frequency +/- 3db10.5-125hz
Amplifier4000 watts RMS
Dimensions (HxWxD)28″ x 58″ x 20.5″ (HxWxD)
Shipping Weight (Less Pallet)265 lbs
Construction18mm, 13ply, void free, Baltic Birch (several times stronger and more expensive than MDF)
Exterior FinishMatte Black Paint
ConnectorsRCA and XLR
Warranty5 year Manufacturer defect (amplifier 3 year)

Punch Where It Matters

The dual 18″ drivers and powerful Class-D amplifier give this subroom pressure that shows up in deep scenes and heavy bass passages. It’s not just loud — it stays clean and controlled, even when you push levels.

Low Tuning Means Reach

Because the cabinet is bass-reflex tuned to around 10 Hz and uses a large slot port, the 4000ULF-ST digs deeper than most ported designs without choking. That gives you usable output in the lowest audible frequencies.

Practical Build and Setup

The Baltic birch enclosure stays quiet under load, and the front-firing layout makes placement less of a puzzle. With balanced inputs, trigger support, and LF Adjust, you get control over how it fits into your system without guesswork

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Tristan Richards
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Tristan Richards
Noah Batterson
"Zack was generally helpful during the process. I can't go 5/5 though because it took..." ... click to read more
★★★★★
Noah Batterson
Rhys Bartlett
"Can't put into words how happy I am for choosing to buy from these guys...." ... click to read more
★★★★★
Rhys Bartlett
JD Barker
"Selecting the right hardware for a home theater can be a daunting task. Zach and..." ... click to read more
★★★★★
JD Barker
Michael B
"Great experience using these guys. Mounted my 75 inch tv and removed it a year..." ... click to read more
★★★★★
Michael B
Bobby Cotten
"Sound system is the best ever and cut the cable cord. Lights, blinds, sound and..." ... click to read more
★★★★★
Bobby Cotten
Anthony Brewer
"Called Dreameadia to acquire about an outdoor sound system for my buddies' place. Kellen helped..." ... click to read more
★★★★★
Anthony Brewer
Gunnu
"Great stop for all home theater needs and wonderful service"
★★★★★
Gunnu
Bryan Kinnnamon
"Fast Quote with a great design."
★★★★★
Bryan Kinnnamon
Kirk Adams
"Kellen was awesome to work with. Honest and very helpful I would highly recommend him"
★★★★★
Kirk Adams
Alan Moses
"Zach & the Dreamedia crew were awesome. they will get you the best equipment..." ... click to read more
★★★★★
Alan Moses
Shawn Goldstein
"I wanted to take a minute to share my excellent experience with Dreamedia Home Theater...." ... click to read more
★★★★★
Shawn Goldstein
Tristan Richards
"Saw Dream media researching media rooms on YouTube. They are Texas company so decided..." ... click to read more
★★★★★
Tristan Richards
Noah Batterson
"Zack was generally helpful during the process. I can't go 5/5 though because it took..." ... click to read more
★★★★★
Noah Batterson
Rhys Bartlett
"Can't put into words how happy I am for choosing to buy from these guys...." ... click to read more
★★★★★
Rhys Bartlett
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Depending on location, there is a good chance one of our preferred partners can do the installation. We have over 20+ installers in our network across the country.