Monolith THX Ultra 2000W Subwoofer - 13" Black Ash

Updated August 13, 2026

This auction ended on August 20, 2026. See upcoming auctions from ATX Auctions Tampa.

Lot number	9
Auction	#160 Tampa General Merchandise Surplus & Overstock Auction
Date	August 20, 2026 at 6:00 PM EDT
Auction house	ATX Auctions Tampa
Location	Tampa, Florida

Notes: Speaker only included No power cord-unable to test function Condition: Used - Very Good Damaged?: No In Packaging?: Yes Missing Parts?: Yes Missing Parts Description: Subwoofer only included Functional?: Unable to Test ASIN: B09DJ3XSHQ Brand: Monoprice Model: 141496 Title: Monolith THX Ultra 2000W Subwoofer - 13" Black Ash THX Ultra Certified: THX engineers completed hundreds of different scientific tests to ensure the highest audio performance possible. The tests ensure the speaker can reach the high volumes necessary to achieve THX Reference Level, without creating audible distortion or artifacts. THX Ultra Certified products are designed for large rooms, up to 3,000 cubic feet in size, with a 10~12 foot viewing distance from the screen. 13 Inch Woofer: The Monolith 13 Inch driver was developed from the ground up, with a design focus on achieving output, accuracy, dynamics, and linearity, while minimizing distortion. It is enclosed in a cabinet made from HDF material, with massive internal bracing, and outfitted with three ports that can use foam plugs to run the subwoofer in sealed, semi sealed, or ported mode, as you see fit. 2000 Watt Amplifier: The 2000 watt (RMS) amplifier (3800+ watt peak) is built around a Texas Instruments 48 bit data path, with 28-bit filter coefficients, and DSP engine. Each amplifier's transfer function, power output limiting, and thermal protection are monitored to the millisecond and are customized for each individual driver. The high efficiency Class D amplifier modules are based on a proven topology that has been continuously refined over the past 8 years. The amplifier has vast reserves THX Ultra Certified products bring the cinematic experience to large home theaters, up to 3,000 cubic feet in size, with a 10~12 foot viewing distance from the screen*. *Previously known as Select2. 13 Inch Driver: Every part of this driver has been developed from the ground up and customized to deliver high output, low distortion, and accurate bass. Our unique hybrid cone combines long fiber pulp and fiberglass, taking advantage of the pulp's superior stiffness with the additional rigidity and lightweight properties of fiberglass, to deliver a driver of massive durability and excursion. The result is a cone that achieves optimal motion at all frequencies it is asked to produce and beyond.

Monolith THX Ultra 2000W Subwoofer - 13" Black Ash

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