Bag End Loudspeakers E-Trap Electronic Bass Trap

The electronic bass trap offers a precise tool to attack the very worst problems with a high degree of effectiveness in a fraction of the space. It also offers a practical low-cost solution to existing rooms where problems are present and room re-design or large passive absorbers are not an option.

Rated in Stereophile Magazine yearly Recommended Components listing, 2012 - 2017:
http://www.stereophile.com/content/2016-recommended-components-miscellaneous#

The Bag End E-Trap can be viewed as an electronic acoustic absorber. It incorporates a feedback control scheme into a loudspeaker making the speaker exhibit the same dynamics as that of a reactive absorber. Because it is active it is capable of adding considerable damping to a room and still be very small in size (18" x 13" x 10"). The small size allows the designer to place it in acoustically strategic locations without affecting the rooms upper frequency characteristics or impacting floor space and cosmetics.

The E-Trap offers precise tunability of two target frequencies simultaneously. The frequency and amount of damping is adjustable via controls. Once the E-trap is placed and tuned, it requires no additional attention. The precision, ease of tuning and small size offered by the E-trap provide an additional tool to absorb low frequencies and can provide a dramatic improvement in the sound of the room.

Priced new at $1758!
$950 obo 
E-trap Tech: http://bagend.com/products/series/active-bass-trap/
Data sheet: http://bagend.com/wp-content/uploads/2014/11/E-Trap.pdf