I am new to the site and thought this would be the best of all places to ask this question. Why does no one(that I can find) offer some type of upgrade for av preamps? I have a ADA cinema reference 2 and really don’t want to part with it after having it serviced last year. It has four surround pre outs already. Does no do the kind of work as for adding hdmi in and out. With the latest sound decoder?