Hi! I am selling my Radial Firefly, which is the best DI box on the planet, and a really nice pre-amp to boot. It is in mint condition, with less than an hour of use. Here is a review of the unit, with all of the specs: http://www.rexbass.com/2013/05/radial-engineering-firefly-di-box-review.html These have street price of $599, and I am asking $500 obo. PM me if interested.