SubTrap: Bass Absorber and Mode Damper

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You Want Better Bass Sound...but a TubeTrap Absorber is not Quite Right for Your Situation... it's time for a subwoofer stand! You bought a new sub and were trying to reach the musical blue sky...but you ended up with the subwoofer blues.  You thought maybe deep bass was supposed to sound this way: drab, sluggish and boring. You keep the volume turned down and the crossover set low so your sub can “support” the bottom end without drowning out the music. But... you know you can do better.

Now you can "raise" your subwoofer to its full performance potential! The SubTrap is more than a simple vibration isolation stand. In addition to isolation, it absorbs excess bass (the BAD bass) and decouples your subwoofer from room modes. Once you hear the difference, you’ll never go back! Only from ASC.

Installation and integration could not be easier; just slip a SubTrap underneath your sub. You'll instantly improve sonic detail, changing “fuzzy” playback into a richly detailed picture by lowering the running noise floor of the room in the all-important low bass range. You'll hear musical bass lines you never knew existed!

Utilizing our patented Isothermal technology to boost the low bass performance, the ASC SubTrap should be the foundation of your acoustic control plan.

Acoustic Applications: 

  • Home Theater
  • Two-channel HiFi Listening
  • Home Studio
  • Professional Studio
  • Live sound 

    How it Works

    Sound Absorber, Isolator, and Damper in one.

    The resonant modes inherent to rooms often cause what we call “room boom,” a muddled blur of sound that can range from disorienting to painful. This also masks subtle sonic detail all the way through the treble range, and it happens even when the subwoofer is producing great bass and plenty of detail. The SubTrap reduces the running reverberant noise floor in the room, allowing this detail to reach you-the listener.

    By raising the sub off the floor and putting a SubTrap under it, the subwoofer is effectively decoupled from the vertical room mode. This reduces the degree of energy storage in the room, allowing the playback volume of the subwoofer to be raised much higher than before without suffering painful room boom.

    The SubTrap utilizes the same RC-time constant acoustic circuit as our famous TubeTraps to provide lower bass extension than competitor's products of the same size. In terms of bass response, the SubTrap-18 is comparable to a TubeTrap Model-20 and the SubTrap-22 is comparable to a TubeTrap Model-24.

    The outer surface of the SubTrap is composed of a flow-resistive membrane while the inside is an capacitive air cavity, and together they act as an acoustic high-pass circuit with a rolloff below 50 Hz. Thanks to the isothermal upgrade, the equivalent of heat sinks have been added to eliminate the thermal backpressure of compression, providing a 200% improvement in the deep bass and 130% in the upper/mid bass.

    isothermal science for bass sound acoustic absorption explained


    • SubTrap-18
      • Dimensions: 18"x18"x18" LWH
      • Weight: 30 lbs
      • Shipping Details: UPS Box
    • 22" SubTrap
      • Dimensions: 22"x22"x22" LWH
      • Weight: 40lbs
      • Shipping Details: UPS Box (oversize)
    • Standard Product Absorption Curve
      subtrap subwoofer stand sound absorption curve
    • Isothermal Performance Boost subwoofer stand sound absorption isothermal effect
    • Mounting information: Free standing
    • Feet: 1" butyl rubber isolation-type
    • Stackable: Yes
    • Load Bearing Capacity: 250lbs
    • Fire Rating: Class 1 fire rated ASTM E-84
    • Finish Colors: Guilford FR 701 Series
    • Warranty: 1 year parts and labor

    The SubTrap is a recommended upgrade for subwoofer playback by Stereophile, Wide Screen Review, Home Theater, Home Theater Review, Secrets of Home Theater and High Fidelity and The Absolute Sound.

    “My first and usual test piece was the opening 30 Hz organ note at the beginning of the movie 2001: A Space Odyssey. That note is supposed to sound like approaching thunder. In the past, when I listened for this note, it was distant alright, distant and THIN. With the SubTrap I have finally (after many years) heard this note the way it was meant to be heard… With other music the bass is tighter, cleaner, faster and deeper. Being a ‘bassaholic’ for many years I cannot express fully enough what a difference the SubTrap has made for me. When I get my Supercube II subwoofer, I’ll be getting a 18″ SubTrap for that one too. Thank you, thank you, thank you…” - L Harvey (satisfied SubTrap owner)

    “Without a SubTrap, the excellent rhythm & timing that I have gotten used to was diminished to some extent; the bass seemed just a tad slow on rock music. Also, there was a somewhat ‘plasticky’ and ‘thuddy’ coloration to the bass. What is more, I could not contain my surprise when, while spinning a piece for six percussionists and choir (Wolfgang Rihm, last part of Tutuguri), I heard a ‘brownish’ coloration from large snare drums, the sound of which did not have lots of bass output! (The somewhat thuddy sound upon subsequent entry of the heavy bass drums was the final nail in the coffin for me). Putting back the SubTrap under the subwoofer confirmed that the ‘brownish’ coloration of the snare drums had been no illusion; the pristine sound that I had been used to returned” - A Moritz (satisfied SubTrap owner)


    SubTrap-18: (fits most subwoofers using drivers 15″ and smaller)

    recommended compatible subwoofers:

    JL Audio Fathom f112

    SVS SB-3000

    Rythmik F12

    SubTrap-22: (fits larger subwoofers using drivers up to 18″)

    recommended compatible subwoofers:

    JL Audio Fathom f113v2

    SVS SB16-Ultra

    Rythmik F18