Exposure xxi preamp and iv dual regulated amplifier questions

Hello.  I recently purchased a set up which includes an Exposure xxi preamp and iv dual regulated amplifier along with a pair of sonus faber grand piano speakers.  They came as a package deal but I was really only interested in the speakers.  I'm thinking of selling the exposure separates but I can't find much info on them.  Any thoughts on these?  I'm clueless on what a fair asking price is for them is?  Should I sell them together or separate?  Sorry for all the questions, any help would be appreciated.