Check the listing for details. dbx Dual 31-Band Graphic Equalizer Model 231s EQ - Open-box. Color: Silver, Condition: Open box. Listed at 159.00 USD. This item is "Open-box" condition; it has never been used! The unit is in pristine condition! The box includes all original packing, power cable, user manual and rack-mount screws. Thanks for your interest in this item! -- The dbx Dual 31-Band Graphic Equalizer Model 231s EQ is a professional-grade signal processor perfect for music and audio production. With its rack-mountable form factor and silver color, this equalizer offers high-quality audio equalization capabilities. Featuring two channels I/O, (XLR and 1/4") , this model includes input gain control, a low-cut filter, boost/cut range and a level meter. Ideal for musicians, sound engineers, and producers looking to achieve optimal sound quality in their recordings and live performances.