How It Works

Early Reflection Control

“If I could go back in time to 20 years ago when I first started engineering, I would not buy a single piece of gear until I had an AttackWall.” Gregory Scott | ubk

early reflections controlled by attackwall acoustics

The AttackWall wraps around the console and engineer so neatly that very little sound escapes outside of the Wall.  Broad-band early reflections are controlled by the StudioTraps' absorptive sides, creating a reflection free zone (RFZ) right at the mix position, in any room.   The diffusive sides of all StudioTraps (the side with the silver button) should face away from the mix position to create a true RFZ.

The side sections of the AttackWall extend approximately to the engineer's head. This casts a huge acoustic shadow onto the wall, eliminating wall reflections which can cause comb filtering, cross-talk, and phase interference.  Traditional wall-mounted sound absorbing/diffusing panels are not necessary when an AttackWall is used.  The imaging allowed by this arrangement is unparalleled, and your mixes will gain a spatial accuracy never before achieved.  Sound stages can be built in both the horizontal and vertical dimensions, with only your creativity as the limit.

A tight pattern of StudioTraps fits between the monitors and a loose pattern of StudioTraps is placed behind the engineer.  The reflection free zone at the mix position is now complete.  The rear StudioTraps control reflections through the use of acoustic shadow casting, allowing the pattern to be looser than that of the front and side arrays of StudioTraps.  For optimal early reflection control, all StudioTrap diffusers should be pointed away from the mix position.

Time-Delayed Ambient Backfill

lateral diffusing in the attackwall


The AttackWall absorbs image-smearing early reflections, but lets others escape to provide time-delayed backfill.  Without an ambient tail to the energy-time-curve, a reflection-free recording studio would be exhausting to work in.  The ambience is provided by the diffusive sides of the StudioTraps, which scatter sound at 500 Hz and higher.


Vertical Diffusion from the AttackWallThe AttackWall is setup to vent treble in two ways.  Some sound travels over or under the StudioTraps.  Sound also passes through the openings to the side and behind the engineer.  Escaped sound reflects off the room walls and back into the diffusive side of the StudioTraps.  The acoustic crossovers go to work, absorbing excess bass energy while scattering mid and high frequencies back toward the wall.  Eventually the original escape path of the sound is reversed, and the time-delayed, diffusive, high-pass filtered ambience reaches the mix position.  Through this process, the AttackWall creates an LEDE-type of sonic signature in any room.

The listening environment of the AttackWall is so comfortable and natural, you may find yourself mixing for much longer sessions and re-mixing old projects for the sheer joy that using the AttackWall brings.

Vertical Mode Control

 Speaker Vertical Phase Cancelling

A typical monitor on a stand is located about halfway between the floor and the ceiling. The floor and ceiling reflections couple with one another, imposing strong phase interference. This typically causes a drop in sound level around 70 hz for 8' ceilings, and a boost in level around 140 hz. The engineer will apply equalization to compensate, leading to poor mix translation. The solution is the ASC MonitorStack.

In the AttackWall, a monitor speaker sits on a MonitorStand Base, which is designed to extract sound power out of the downward moving section of the bass wavefront. A MonitorStand Top rests on top of the speaker to absorb the vertically expanding section of the bass wave front.

The MonitorStack reduces the sound power buildup of vertical resonance between speaker, floor and ceiling. Phase cancel and add effects disappear at the speaker and mix positions without resorting to monitor equalization. Your mixes hang together no matter where they are played.

  Control Vertical Modes with Monitor StandsThe MonitorStack Bases and Tops are purpose built TubeTraps, multi-chambered for strength, vibration resistance and rapid attenuation of bass wavefronts traveling down the length of the TubeTrap. Monitor Stacks are designed and built for axial wave attenuation which differentiates them from the radial attenuation provided by standard TubeTraps. All contact surfaces are fit with edge loaded felt spring isolators. The MonitorStacks are also made to endure the tremendously high sound levels that can only occur so close to the high power drivers in recording studios.

Wall Loaded Mains

horn loading

ATTACK wall bass venting

 Midfield loudspeakers sit on speaker stands which allow the spherical wavefront of the bass range to illuminate the entire room, creating strong early reflections and late reverb.

The front surface of the AttackWall absorbs both the lateral and rearward expansion of the spherical bass wavefront. The upper and lower edges of the AttackWall facilitate diffractive diffusion of the bass wavefront as it expands around the edges and into the acoustic shadow space behind the AttackWall.

This bass diffusing technique of edge diffraction converts a portion of the vertical expanding spherical wavefront in front of the AttackWall into a pair of tumbling bass wavefronts behind the AttackWall. Back venting the bass wavefront weakens the vertical wavefront just as it begins to impact the floor and ceiling thereby minimizing the buildup of vertical reflection and reverberation.

Most engineers do not work in a properly designed and build control rooms. More often than not, they are working in less than ideal locations; live mixing back stage, off site tracking and mixing sessions and all too often just mixing in your own living room. The early bass reflections create standing waves and a lumpy bass response curve due to phase add/cancel effects. The late bass reverb buildup weakens the signal to room noise ratio which blurs musical dynamics and masks musical clarity. The ASC AttackWall is engineered and time proven to turn any room into a world class control room without having to listen to the sound of even one hammer blow.