Acoustic Sciences Corporation (ASC)

TubeTrap

$729 MSRP

The ASC Tube Trap is a cylindrical, modular broadband bass trap and diffusor that has been a mainstay of professional studios and high-end listening rooms for decades, prized for its combination of deep low-frequency absorption and an integral treble-range diffuser on one face (source: https://www.acousticsciences.com/product/tubetrap-bass-trap/). Its round, air-cavity-loaded design is "impedance-matched" to sound, allowing it to act as a fast-reacting bass absorber typically placed in room corners behind speakers or at the listening position (source: https://www.acousticsciences.com/product/tubetrap-bass-trap/, source: http://www.asc-hifi.com/tube-trap-technicals.htm).

MSRP

$729

Used market · Good

$325

-55% vs MSRP

as of Sep 1, 2026

Sell or trade this Add to my system

MSRP to used market

Price history will fill in as sales are recorded.

Specifications

Materials: Internal sealed air cavity with an integral treble-range polycylindrical diffuser face; exact shell/core materials not published in fetched sources
Product type: Modular, self-contained cylindrical broadband bass absorber with integral treble-range polycylindrical diffuser
Price 16 3 unit: $729
Standard length: 4 ft (47-1/2" actual); custom lengths available
Mounting placement: Freestanding; no installation hardware required — placed in room corners, typically behind speakers or at rear listening-position corners
Standard diameters: 9", 11", 13", 16", 20" — larger diameter extends absorption to lower frequencies
Example model tested: 16" diameter × 3 ft IsoThermal TubeTrap
Category uncategorized: Tags: ASC , audiophile , bass trap , basstrap , diffusion , HiFi , original , portable , tube trap
Diffusion crossover frequency: 400 Hz (broadband absorption below, adjustable diffusion above)
Measured absorption 16 3 unit: 63 Hz: 8.2 sabins; 125 Hz: 13.4 sabins; 500 Hz: 11.7 sabins; 1 kHz: 9.1 sabins; 8 kHz: 6.1 sabins per unit
Bass rolloff frequency by diameter: 9": 110 Hz; 11": 90 Hz; 13": 70 Hz; 16": 55 Hz; 20": 30 Hz

Sources

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