i've got a vox AC15CC1 that I would like to try a difference reverb tank in as i am unhappy with the reverb right now. too thin and the decay is too long. love the amp but this is a weak link. it doesn't boing at all and sounds like bad digital to me. it's a little ~9" 3 spring belton unit and i have all the specs for it. i would like to try something more like the type 4, 17" type in my deluxe reverb which of course has completely different specs and thus won't work just to try. quick question regarding how much sway i have in the impedance ratings... the stock vox tank is 800ohm (input) and 2575ohm (output) the closest i can get in a type 4 is 600ohm (in) and 2250ohm (out). 25% less in and 13% less out. there is a series 9 available in the correct impendances but from my searches here, word seems to be that it's too much when the amp only has a mix control. any advice, or other suggestions to sweeten up the reverb and get it a little more fenderish. i've got a reverb pedal but it hisses like all the rest of them do so i'd like to keep it out of the chain if possible. thank you.