This eq is in perfect working order. I used this with an SVS Ultra sub. Very easy to set up & operate. I was able to get an oustanding 1/3 octave curve. I'm selling to get a parametric eq. I have the original box & manual. I purchased this from another Forum member for $100 plus $10.00 shipping, so I'm looking to do the same here. I have a perfect 200+ positive rating on ebay(gjthomas1) and +9 here on the forum. Email w/ questions. Thanks!